Quality assurance for Chinese herbal formulae: standardization of IBS-20, a 20-herb preparation

  • Siu-Po Ip1,

    Affiliated with

    • Ming Zhao1,

      Affiliated with

      • Yanfang Xian1,

        Affiliated with

        • Mengli Chen1,

          Affiliated with

          • Yuying Zong1,

            Affiliated with

            • Yung-Wui Tjong1,

              Affiliated with

              • Sam-Hip Tsai1,

                Affiliated with

                • Joseph JY Sung2,

                  Affiliated with

                  • Alan Bensoussan3,

                    Affiliated with

                    • Brian Berman4,

                      Affiliated with

                      • Harry HS Fong5 and

                        Affiliated with

                        • Chun-Tao Che1Email author

                          Affiliated with

                          Chinese Medicine20105:8

                          DOI: 10.1186/1749-8546-5-8

                          Received: 18 September 2009

                          Accepted: 22 February 2010

                          Published: 22 February 2010

                          Abstract

                          Background

                          The employment of well characterized test samples prepared from authenticated, high quality medicinal plant materials is key to reproducible herbal research. The present study aims to demonstrate a quality assurance program covering the acquisition, botanical validation, chemical standardization and good manufacturing practices (GMP) production of IBS-20, a 20-herb Chinese herbal formula under study as a potential agent for the treatment of irritable bowel syndrome.

                          Methods

                          Purity and contaminant tests for the presence of toxic metals, pesticide residues, mycotoxins and microorganisms were performed. Qualitative chemical fingerprint analysis and quantitation of marker compounds of the herbs, as well as that of the IBS-20 formula was carried out with high-performance liquid chromatography (HPLC). Extraction and manufacture of the 20-herb formula were carried out under GMP. Chemical standardization was performed with liquid chromatography-mass spectrometry (LC-MS) analysis. Stability of the formula was monitored with HPLC in real time.

                          Results

                          Quality component herbs, purchased from a GMP supplier were botanically and chemically authenticated and quantitative HPLC profiles (fingerprints) of each component herb and of the composite formula were established. An aqueous extract of the mixture of the 20 herbs was prepared and formulated into IBS-20, which was chemically standardized by LC-MS, with 20 chemical compounds serving as reference markers. The stability of the formula was monitored and shown to be stable at room temperature.

                          Conclusion

                          A quality assurance program has been developed for the preparation of a standardized 20-herb formulation for use in the clinical studies for the treatment of irritable bowel syndrome (IBS). The procedures developed in the present study will serve as a protocol for other poly-herbal Chinese medicine studies.

                          Background

                          Herbal medicines, whether in the form of single herb phytomedicine or multiple herb mixtures, are popular around the world. However, evidence of efficacy and safety has not been well documented [1]. Lack of effective quality assurance affects the efficacy and safety assessment of herbal products [17]. For valid pharmacological or clinical efficacy evaluations, a standardized single batch clinical formulation should be employed. As part of a research project to evaluate the therapeutic potential of a 20-herb Chinese medicine formula (the IBS-20 formula) for treating irritable bowel syndrome (IBS), we have developed and tested a quality assurance program for the production of the multi-herb preparation. IBS affects 10-20% of the global population [8] and it has not been successfully treated with conventional medications such as bulking, smooth muscle relaxant, prokinetic and psychotropic agents, nor loperamide and peppermint oil [9].

                          We are presently conducting a clinical study of a 20-herb Chinese medicine formula (IBS-20) to determine its efficacy potential in the treatment of this disorder. To insure the validity and reproducible results in conducting this study, we established a robust quality assurance (QA)/quality control (QC) program. The present paper describes the methods employed, covering all aspects of the production of IBS-20 from source material acquisition, botanical validation, chemical standardization, extraction and formulation. The protocols established in this study may be used as a model for the quality assurance of other herbal products.

                          Methods

                          Plant materials

                          The component herbs in the formula are as follows: Pogostemon cablin (herb) (4.5%, w/w), Angelica dahurica (root) (2%), Artemisia scoparia (herb) (13%), Atractylodes macrocephala (rhizome)(9%), Aucklandia lappa (root) (3%), Bupleurum chinense (root) (4.5%), Citrus reticulate (fruit peel) (3%), Codonopsis pilosula (root) (7%), Coix lacryma-jobi (seed) (7%), Coptis chinensis (rhizome) (3%), Fraxinus rhynchophylla (bark) (4.5%), Glycyrrhiza uralensis (root) (4.5%), Magnolia officinalis (bark) (4.5%), Paeonia lactiflora (root)(3%), Plantago asiatica (seed) (4.5%), Phellodendron amurense (bark) (4.5%), Poria cocos (fruiting body) (4.5%), Saposhnikovia divaricata (root) (3%), Schisandra chinensis (fruit) (7%) and Zingiber officinale (rhizome) (4.5%). All 20 herbs were acquired in the prescribed proportions (% w/w) from Zhixin Chinese Pharmaceutical Co. Ltd. (Guangzhou, China). The aggregate weight of the 20 herbs was 400 kg (Additional File 1). Voucher samples (#IBS-01 to IBS-20) were deposited at the herbarium of the School of Chinese Medicine, Chinese University of Hong Kong (Hong Kong SAR, China). The individual bulk herb samples were stored in air-tight containers kept in air-conditioned environment until use. The herbs were identified in both Chinese and botanical (Latin binomial) names. When two or more species share the same Chinese name, only one species was selected for chemical and biological/clinical studies.

                          Botanical authentication

                          All 20 herbs were authenticated macroscopically and microscopically. Macroscopic examinations included measurements of appearance, size, shape, color, texture, odor, taste, fracture and other characteristics of a herb according to pharmacopoeias [1013]. Microscopic examinations determined characteristic elements of each herb in both tissue and powder forms. In cross sectional examination, herbal material was softened by immersion in water, alcohol or glycerin prior to sectioning. Sliced tissue, prepared with a microtome, was mounted on a glass microscope slide and clarified with chloral hydrate, lactochloral and/or sodium hypochlorite, followed by phloroglucinol, potassium iodide or Sudan Red. In powder analysis, each herbal material was pulverized to 65-mesh in size, mounted on a microscope slide, cleared with chloral hydrate, lactochloral and/or sodium hypochlorite, and then examined for the presence, size, shape and numbers of characteristic elements and inclusions such as vessels, calcium crystals, crystalline fibers, stone cells and starch grains. The examination protocols followed the World Health Organization (WHO) Quality Control Methods for Medicinal Plant Materials [14], the Pharmacopoeia of the People's Republic of China (CP) [10] and the Hong Kong Chinese Materia Medica Standards (HKCMMS) [1113]. The recorded macroscopic and microscopic data for each herb were verified against those in the CP and/or the HKCMMS, coupled with visual comparison with available reference samples.

                          Reference marker compounds and reagents

                          Reference marker compounds for qualitative and quantitative high performance liquid chromatography (HPLC) were obtained from the National Institute for the Control of Pharmaceutical and Biological Products (Beijing, China) and further validated by mass spectrometry (MS) and nuclear magnetic resonance spectroscopy (NMR) and purity (>98%) analysis with HPLC and/or liquid chromatography-mass spectrometry (LC-MS). Chemicals and general solvents were of reagent grade and HPLC solvents were of HPLC grade (BDH, United Kingdom).

                          Purity and contaminant determination

                          Purity rubric tests, including foreign matters, total ash, acid-insoluble ash, water and extractive contents, were carried out according to the CP or HKCMMS [1013]. Determination of heavy metals (arsenic, cadmium, mercury, and lead), pesticides, microbials and microbial toxin (aflatoxin) was carried out according to the HKCMMS [1113]. Briefly, for heavy metal analysis, the herbal matrix was dissolved by microwave-assisted acid digestion, and the presence and quantity of mercury, lead, arsenic, and/or cadmium, if any, were determined by inductively coupled plasma-mass spectrometry (ICP-MS). Pesticide residues (e.g., aldrin, dieldrin, chlordane, dichlorodiphenyltrichloroethane, endrin, heptachlor, hexachlorobenzene, hexachlorocyclohexane isomers, lindane and quintozene) were quantitatively determined with gas chromatography (GS). Mycotoxins (aflatoxins B1, B2, G1 and G2) were detected as previously described [1113, 15]. Microorganism examinations included total bacteria, mould and yeast, Escherichia coli and Salmonella counts as described in the CP [10].

                          Chemical standardization

                          Chromatographic fingerprint analysis HPLC fingerprinting with one or more reference markers was carried out according to the HKCMMS and/or CP [1013]. As an example, the procedure used for Rhizoma Coptidis (Huanglian) is described here. The herb was ground to powder, extracted in MeOH by ultrasonication for 30 minutes and filtered. The chromatographic system consisted of an Agilent 1100 HPLC system (Agilent Technologies, USA) equipped with a secondary pump, a diode-array detector, an autosampler, and a column compartment, an Alltech Alltima C18 column (4.6 × 250 mm) (Alltech, USA) packed with 5 μm diameter particles and an Alltech Alltima guard column (7.5 × 4.6 mm, 5 μm) (Alltech, USA); solvent system: 0.1% trifluoroacetic acid (%, v/v) (A) and acetonitrile (%, v/v) (B) with a linear gradient elution, 0% B-50% B at 0-48 minutes, 50% B-100% B at 48-55 minutes, 100% B was held for five minutes; flow rate: 1.0 ml/min; detection: 346 nm; reference marker: berberine. Information of the reference marker compounds for each herb is available in Additional File 1.

                          Quantitative analysis

                          Quantitative determination of selected marker compound(s) in each herb was performed with HPLC analysis. As an example, the quantitative analysis of Cortex Magnoliae Officinalis (Houpo) is described here. Preparation of the herb and the HPLC setup were the same as described above. The mobile phase contained 0.4% formic acid and acetonitrile (35:65); flow rate: 1 ml/min; detection: 294 nm. Information of the reference marker compounds for each herb is available in Additional File 1.

                          Inter-laboratory methods validation

                          Inter-laboratory validation of fingerprint and quantitative HPLC analytical protocols were carried out in laboratories at the Chinese University of Hong Kong and the University of Western Sydney prior to use. Both laboratories followed the identical experimental protocols and the results were critically compared.

                          Production of herbal extracts and the IBS-20 formula

                          The 20 dried herbs were individually reduced in size by milling or slicing and mixed in the prescribed proportion (% w/w), followed by extraction with water under GMP at the Hong Kong Institute of Biotechnology (Hong Kong Special Administrative Region, China). Briefly, the herb mixture (400 kg) was decocted with 10-fold (w/v) of boiling distilled water for 60 minutes, cooled and collected. After fresh boiling water was added, the mixture was decocted for a second time. The cooled extracts were pooled, filtered, concentrated and spray dried to obtain a powder (34% yield w/w based on raw herbs). An aliquot was set aside for chemical and pre-clinical biological studies. The remaining powdered extract was then formulated with water-soluble starch (excipient) in a ratio of 1:1 into the clinical product in the form of an aluminum foil packed sachet.

                          Chemical standardization of the IBS-20 formula

                          Chemical standardization of the clinical herbal extract with selected reference markers was performed with HPLC coupled with diode array detection and atmospheric pressure chemical ionization mass spectrometry (HPLC-DAD-APCIMS) analysis. Briefly, the powdered extract was sonicated in MeOH for 30 minutes and filtered through a cellulose syringe filter. An aliquot (10 μl) of filtrate was injected into an Agilent 1100 HPLC system equipped with an Alltech Alltima C18 column (4.6 × 250 mm, 5 μm diameter). The mobile phase consisted of 0.1% trifluoroacetic acid in water (v/v) (A) and acetonitrile (B) with the gradient elution conditions as follows: 12% B-13% B at 0-10 minutes, 13% B - 16% B at 10-40 minutes, 16% B-36.4% B at 40-67 minutes, 36.4% B-60% B at 67-100 minutes, from 100-120 minutes a gradient was applied to 100% B and was held for five minutes, followed by a 10-minute equilibration period at 12% B; flow rate: 1.5 ml/min; temperature: 27.5°C (constant). For detection, an Agilent 1100 series LC/MSD trap (Agilent Technologies, USA) was connected to the HPLC system via an APCIMS interface. Ultra-high purity helium was used as the collision gas and high purity nitrogen as the nebulizing gas. The optimized parameters in the positive ionization mode were as follows: nebulizer gas pressure: 50 psi; dry gas flow: 5.0 l/min; dry temperature: 350°C; vaporizer temperature: 400°C; full-scan MS analysis in the range of m/z 100-2200. The reference marker compounds present in the sample were identified by retention time, MS fragmentation and UV spectra.

                          Stability monitoring

                          The stability of the chemically standardized herbal formula was monitored in real time over a period of at least one year. The HPLC fingerprint profiles as well as the quantitative content of eight selected major marker compounds in the clinical formula were measured on days 0, 2, 3, 7, 14, 30, 60, 90, 180, 360, 450 post-production with HPLC and LC-MS respectively.

                          Results and discussion

                          During the selection of herbs, we paid special attention to the cases where the Chinese names correspond to more than one species. For example, Cortex Phellodendri refers to the bark of either Phellodendron amurense or Phellodendron chinense which are similar in macroscopic appearance and used interchangeably in Chinese medicine. Our studies in support of the HKCMMS [11] revealed significant differences in microscopic and chemical profiles of the two species using thin-layer chromatographic (TLC) and HPLC fingerprints as well as differences in contents using quantitative HPLC analysis. Microscopically, the cortex of Phellodendron chinense is broader than that of Phellodendron amurense (Figure 1), while the stone cells are more abundant and scattered in the outer layer of phloem of the former species (Figure 1a) but are sparsely scattered in the cortex of the latter (Figure 1b). Chemically, the marker compound profiles also differ significantly (Figure 2). In Phellodendron chinense (Figure 2a), berberine predominates while palmatine is not discernible. On the other hand, both berberine and palmatine are present and appear to be similar in concentration in the cortex of Phellodendron amurense (Figure 2b). Thus, to ensure chemically and biologically reproducible batches, we decided to use the cortex of Phellodendron amurense in our preparation.
                          http://static-content.springer.com/image/art%3A10.1186%2F1749-8546-5-8/MediaObjects/13020_2009_Article_67_Fig1_HTML.jpg
                          Figure 1

                          Microscopic features of cross section. (a) Phellodendron chinensis bark. (b). Phellodendron amurense bark 1: Cork; 2: Cortex; 3: Stone cells; 4: Prisms of calcium oxalate; 5: Phloem; 6: Phloem fibres and crystal fibres; 7: Phloem rays.

                          http://static-content.springer.com/image/art%3A10.1186%2F1749-8546-5-8/MediaObjects/13020_2009_Article_67_Fig2_HTML.jpg
                          Figure 2

                          HPLC chromatograms. (a). Phellodendron chinensis bark. (b) Phellodendron amurense bark 1: palmatine; 2: berberine.

                          Purity rubric tests indicated that the herbs met the limits established by the CP and/or HKCMMS [1013] (in the cases where regulatory standards are available) (Table 1). Tests for contaminants showed that none of the 20 herbs exceeded the standards established by the CP and/or HKCMMS [1013] (Table 2).
                          Table 1

                          Regulatory standards and experimental results of purity and contaminant tests

                          Pharmaceutical name

                          Foreign matters

                          Ash

                            

                          Extractives

                          Total ash

                          Acid-insoluble Ash

                          Water content

                          Water-soluble extractives

                          Ethanol-soluble extractives

                          Radix Angelicae Dahuricae

                          --

                          (<1.0%)

                          6.0%a

                          (4.1%)

                          1.5%a

                          (<1.0%)

                          14%a

                          (10%)

                          --

                          (27%)

                          15%a

                          (17%)

                          Herba Artemisiae Scopariae

                          --

                          (<1.0%)

                          4.0%a

                          (2.9%)

                          2.0%a

                          (<1.0%)

                          15%a

                          (9.7%)

                          --

                          (25%)

                          --

                          (17%)

                          Rhizoma Atractylodis Macrocephalae

                          --

                          (<1.0%)

                          5.0%a

                          (3.7%)

                          1.0%a

                          <1.0%)

                          --

                          (10%)

                          --

                          (67%)

                          --

                          (12%)

                          Radix Aucklandiae

                          2.0%b

                          (<1.0%)

                          4.5%b

                          (3.2%)

                          1.0%b

                          (<1.0%)

                          14%b

                          (10%)

                          65%b

                          (68%)

                          15%b

                          (27%)

                          Radix Bupleuri

                          2.0%b

                          (<1.0%)

                          7.7%b

                          (1.0%)

                          3.5%b

                          (2.8%)

                          5.0%b

                          (4.4%)

                          12%b

                          (22%)

                          11%b

                          (17%)

                          Pericarpium Citri Reticulatae

                          --

                          (<1.0%)

                          --

                          (4.7%)

                          --

                          (1.4%)

                          13%a

                          (11%)

                          --

                          (39%)

                          --

                          (39%)

                          Radix Codonopsis

                          1.0%b

                          (<1.0%)

                          6.0%b

                          (4.1%)

                          2.5%b

                          (<1.0%)

                          12%b

                          (10%)

                          41%b

                          (60%)

                          21%b

                          (52%)

                          Semen Coicis

                          2.0%a

                          (<1.0%)

                          3.0%a

                          (2.3%)

                          --

                          (<1.0%)

                          15%a

                          (9.9%)

                          --

                          (6.0%)

                          5.5%a

                          (6.0%)

                          Rhizoma Coptidis

                          2.0%b

                          (<1.0%)

                          5.0%b

                          (2.5%)

                          2.5%b

                          (<1.0%)

                          12%b

                          (7.5%)

                          17%b

                          (23%)

                          14%b

                          (19%)

                          Cortex Fraxini

                          --

                          (<1.0%)

                          8.0%a

                          (4.7%)

                          --

                          (1.5%)

                          7.0%a

                          (6.5%)

                          --

                          (8.0%)

                          8.0%a

                          (8.7%)

                          Radix et Rhizoma Glycyrrhizae Praeparata cum Melle

                          --

                          (<1.0%)

                          5.0%a

                          (3.1%)

                          1.0%a

                          (<1.0%)

                          10%a

                          (8.1%)

                          --

                          (47%)

                          --

                          (43%)

                          Cortex Magnoliae Officinalis

                          1.0%b

                          (<1.0%)

                          8.0%b

                          (4.50%)

                          3.5%b

                          (1.6%)

                          12%b

                          (8.3%)

                          3.0%b

                          (8.0%)

                          5.0%b

                          (9.0%)

                          Radix Paeoniae Alba

                          1.0%b

                          (<1.0%)

                          4.0%b

                          (2.1%)

                          1.0%b

                          (<1.0%)

                          14%b

                          (7.1%)

                          21%b

                          (22%)

                          16%b

                          (17%)

                          Semen Plantaginis

                          --

                          (<1.0%)

                          6.0%a

                          (3.2%)

                          2.0%a

                          (<1.0%)

                          12%a

                          (10%)

                          --

                          (12%)

                          --

                          (3.3%)

                          Cortex Phellodendri Amurensis

                          1.0%b

                          (<1.0%)

                          8.5%b

                          (7.3%)

                          1.0%b

                          (<1.0%)

                          11%b

                          (8.7%)

                          9.0%b

                          (17%)

                          12%b

                          (16%)

                          Herba Pogostemonis

                          2.0%a

                          (<1.0%)

                          11%a

                          (8.6%)

                          4.0%a

                          (2.3%)

                          14%a

                          (9.1%)

                          --

                          (14%)

                          2.5%a

                          (10%)

                          Poria

                          --

                          (<1.0%)

                          4.0%a

                          (2.4%)

                          2.0%a

                          (<1.0%)

                          15%a

                          (9.5%)

                          --

                          (2.0%)

                          --

                          (2.6%)

                          Radix Saposhnikoviae

                          2.0%b

                          (<1.0%)

                          7.0%b

                          (5.1%)

                          2.5%b

                          (1.8%)

                          13%b

                          (7.7%)

                          22%b

                          (27%)

                          19%b

                          (25%)

                          Fructus Schisandrae Chinensis

                          1.0%a

                          (<1.0%)

                          --

                          (4.5%)

                          --

                          (1.4%)

                          --

                          (12%)

                          --

                          (30%)

                          --

                          (31%)

                          Rhizoma Zingiberis Praeparatum

                          --

                          (<1.0%)

                          7.0%a

                          (4.6%)

                          --

                          (<1.0%)

                          --

                          (5.8%)

                          --

                          (13%)

                          --

                          (7.8%)

                          Note: Data in parentheses are experimental results of the samples.

                          a Limit required by the Pharmacopoeia of the People's Republic of China (2005 edition)

                          b Limit required by the Hong Kong Chinese Materia Medica Standards

                          Table 2

                          Limits and experimental results of toxic contaminant tests

                          Test

                          Limit (maximum)

                          Herbal formula

                          Heavy metals:

                            

                          Arsenic (As)

                          2.0 mg/kgb

                          0.30 mg/kg

                          Cadmium (Cd)

                          0.3 mg/kgb

                          0.13 mg/kg

                          Mercury (Hg)

                          0.2 mg/kgb

                          Not detectable

                          Lead (Pb)

                          5.0 mg/kgb

                          0.34 mg/kg

                          Pesticide residues:

                            

                          Aldrin and dieldrin (sum of)

                          0.05 mg/kgb

                          Not detectable

                          Chlordane (sum of cis-, trans- and oxychlordane)

                          0.05 mg/kgb

                          Not detectable

                          DDT (sum of p,p'-DDT, o,p'-DDT, p,p'-DDE and p,p'-TDE)

                          1.0 mg/kgb

                          Not detectable

                          Endrin

                          0.05 mg/kgb

                          Not detectable

                          Heptachlor (sum of heptachlor and heptachlor epoxide)

                          0.05 mg/kgb

                          Not detectable

                          Hexachlorobenzene

                          0.1 mg/kgb

                          Not detectable

                          Hexachlorocyclohexane isomers (α-, β- and δ- hexachlorocyclohexane)

                          0.3 mg/kgb

                          Not detectable

                          Lindane (γ-hexachlorocyclohexane)

                          0.6 mg/kgb

                          Not detectable

                          Quintozene (sum of quintozene, pentachloroaniline and methyl pentachlorophenyl sulphide)

                          1.0 mg/kgb

                          Not detectable

                          Mycotoxins:

                            

                          Aflatoxin B1

                          5 μg/kgb

                          Not detectable

                          Sum of aflatoxins B1, B2, G1 and G2

                          10 μg/kgb

                          Not detectable

                          Microbiological:

                            

                          Total plate counts

                          1000 colony/ga

                          < 10 colony/g

                          Yeast and mould

                          100 colony/ga

                          < 10 colony/g

                          Escherichia coli

                          Absenta

                          Absent

                          Salmonella species

                          Absent

                          Absent

                          a Limit required by the Pharmacopoeia of the People's Republic of China (2005 edition)

                          b Limit required by the Hong Kong Chinese Materia Medica Standards

                          Each herb possesses a unique chemical profile of secondary metabolites which may be used as marker compounds for identification and standardization purposes. Some of these marker compounds have been related to the therapeutic efficacy of the herbs, as exemplified by our recent discovery of magnolol and honokiol as the active antispasmodic effects of Cortex Magnolia Officinalis [16]. Therefore, the marker content, especially that of biologically active compounds, may be used to confirm both the identity and quality of a herb. Additional File 1 summarizes the status of the qualitative (fingerprinting) and quantitative (HPLC) analyses of the herbs. Figure 3 shows the HPLC fingerprint of Rhizoma Coptidis as an example, whereas Table 3 provides the quantitative results of individual herbs. For those herbs that have CP and/or HKCMMS limits for the markers, the marker contents were found to be above the limits in all cases.
                          Table 3

                          Quantitative assay results of the component herbs

                          Pharmaceutical name

                          Reference marker

                          Limit

                          (minimum)

                          Analytical results

                          Radix Angelicae Dahuricae

                          Imperatorin

                          0.080%a

                          0.081%

                          Herba Artemisiae Scopariae

                          Chlorogenic acid

                          --

                          0.31%

                          Rhizoma Atractylodis Macrocephalae

                          --

                          --

                          --

                          Radix Aucklandiae

                          Sum of costunolide and dehydrocostus lactone

                          2.2%b

                          2.7%

                          Radix Bupleuri

                          Saikosaponin a

                          0.16%b

                          0.43%

                          Pericarpium Citri Reticulatae

                          Hesperidin

                          3.5%a

                          6.5%

                          Radix Codonopsis

                          Lobetyolin

                          0.029%b

                          0.069%

                          Semen Coicis

                          Glycerol trioleate

                          0.50a

                          1.1%

                          Rhizoma Coptidis

                          Berberine

                          Palmatine

                          4.1%b

                          0.30%b

                          7.4%

                          1.8%

                          Cortex Fraxini

                          Sum of aesculetin and esculin

                          1.0%a

                          2.1%

                          Radix et Rhizoma Glycyrrhizae Praeparata cum Melle

                          Glycyrrhizic acid

                          --

                          2.7%

                          Cortex Magnoliae Officinalis

                          Sum of magnolol and honokiol

                          2.0%b

                          2.3%

                          Radix Paeoniae Alba

                          Paeoniflorin

                          1.6%a

                          1.8%

                          Semen Plantaginis

                          --

                          --

                          --

                          Cortex Phellodendri Amurensis

                          Berberine

                          Palmatine

                          0.33%b

                          0.18%b

                          0.95%

                          0.40

                          Herba Pogostemonis

                          Patchouli alcohol

                          0.10%a

                          0.23%

                          Poria

                          --

                          --

                          --

                          Radix Saposhnikoviae

                          Sum of prim-O-Glucosylcimifugin and 5-O-methylvisammioside

                          0.24%b

                          0.42%

                          Fructus Schisandrae Chinensis

                          Schisandrin

                          0.40%a

                          0.66%

                          Rhizoma Zingiberis Praeparatum

                          6-Gingerol

                          --

                          0.31%

                          a Limit required by the Pharmacopoeia of the People's Republic of China (2005 edition).

                          b Limit required by the Hong Kong Chinese Materia Medica Standards.

                          http://static-content.springer.com/image/art%3A10.1186%2F1749-8546-5-8/MediaObjects/13020_2009_Article_67_Fig3_HTML.jpg
                          Figure 3

                          Chromatographic fingerprint of Rhizoma Coptidis extract. Number shows in the bracket(s) represent the relative retention of the peak to the marker peak: 1 (0.81); 2 (0.88); 3 (0.89, jatrorrhizine); 4 (0.90); 5 (0.93, coptisine); 6 (0.98, palmatine); 7 (marker, berberine).

                          Inter-laboratory validation of fingerprint and quantitative HPLC demonstrated that the absolute deviation from mean (ADM) values of honokiol and magnolol in Cortex Magnoliae Officinalis were 0.43 and 1.11% respectively, confirming method reproducibility of the present study (Table 4). Similar results were obtained for all other herbs and no significant discrepancies were noted among the findings in Hong Kong and Australian laboratories.
                          Table 4

                          Inter-laboratory validation of quantitative assay of Cortex Magnoliae Officinalis

                           

                          Percentage content (%)

                          ADM (%)

                           

                          CUHK result

                          UWS result

                           

                          Honokiol

                          0.8355

                          0.8427

                          0.43

                          Magnolol

                          1.4815

                          1.5148

                          1.11

                          Note: ADM (absolute deviation from mean) = (| D1 - mean|/mean) × 100%, where mean = (D1+D2)/2; D1 = the first value, D2 = the second value

                          CUHK: Chinese University of Hong Kong

                          UWS: University of Western Sydney

                          The chemical standardization of the IBS-20 formula employed a HPLC-DAD-APCIMS system (Figure 4). Mass spectral analysis revealed 20 marker compounds attributable to ten herbs, of which eight markers were sufficient for quantitative estimation (Table 5). The fact that not all markers of the 20 herbs were detected was most likely due to low solubility of the lipophilic markers in the aqueous decoction. For the three herbs that have no established markers, namely, Rhizoma Atractylodis Macrocephalae, Semen Plantaginis, and Poria, no attempt was made to identify any ingredient from them.
                          http://static-content.springer.com/image/art%3A10.1186%2F1749-8546-5-8/MediaObjects/13020_2009_Article_67_Fig4_HTML.jpg
                          Figure 4

                          Chromatographic fingerprint of the IBS-20 formula.

                          Table 5

                          Identification of markers in the HPLC fingerprint of the formula by LC-MS analysis

                             

                          APCI MS Data (Positive Ion)

                            

                          Peak

                          Identification

                          Time (min)

                          M/QMIPa

                          Other Peaks

                          MS2 of M/QMIP

                          Plant Sourceb

                          Content in formulation

                          (mg/kg)

                          1

                          Esculin

                          6.4

                          341 (M+H)+

                          179

                          179

                          FR

                           

                          2

                          Chlorogenic acid

                          10.3

                          355 (M+H)+

                          163

                          163

                          AS

                           

                          3

                          Aesculetin

                          12.0

                          179 (M+H)+

                           

                          134, 123, 109

                          FR

                          310

                          4

                          Paeoniflorin

                          18.8

                          498 (M+H2O)+

                          301, 179

                          301, 179

                          PL

                           

                          5

                          prim-O-Glucosylcimifugin

                          23.8

                          469 (M+H)+

                           

                          307

                          SD

                           

                          6

                          Magnoflorine

                          32.2

                          342 (M)+

                           

                          297, 265

                          CC, PA

                           

                          7

                          Liquiritin

                          35.9

                          419 (M+H)+

                          307, 257

                           

                          GU

                           

                          8

                          5-O-Methylvisamminoside

                          49.9

                          453 (M+H)+

                          291

                          290

                          SD

                           

                          9

                          Hesperidin

                          52.0

                          610 (M)+

                          465, 449, 303

                          463

                          CR

                          1460

                          10

                          Columbamine

                          60.2

                          338 (M)+

                           

                          323, 294

                          CC

                           

                          11

                          Jatrorrhizine

                          61.3

                          338 (M)+

                           

                          323, 294

                          CC

                           

                          12

                          Epiberberine

                          61.3

                          336 (M)+

                            

                          CC

                           

                          13

                          Coptisine

                          61.4

                          320 (M)+

                           

                          304, 292

                          CC

                           

                          14

                          Palmatine

                          66.5

                          352 (M)+

                           

                          337, 308

                          CC, PA

                          420

                          15

                          Berberine

                          67.3

                          336 (M)+

                           

                          321, 292

                          CC, PA

                          1620

                          16

                          Glycyrrhizic acid

                          76.2

                          823 (M+H)+

                          647, 471, 453, 406

                           

                          GU

                          780

                          17

                          Schisandrin

                          81.8

                          433 (M+H)+

                          415

                           

                          SC

                          140

                          18

                          Honokiol

                          93.3

                          266 (M)+

                          263

                           

                          MO

                          63

                          19

                          Magnolol

                          98.6

                          266 (M)+

                          261

                           

                          MO

                          93

                          20

                          Schisandrin A

                          107.7

                          417 (M+H)+

                           

                          402, 347, 316

                          SC

                           

                          Note: Peak number refers to the chromatographic fingerprint of the clinical preparation (Figure 4). Peaks 6, 10, 12, and13 were identified by LC-MS/MS2 analysis based on the literature values [17, 18] and other peaks were identified by comparison of authentic chemicals. Jatrorrhizine and epiberberine (peaks 11, 12) were co-eluted with the same retention times.

                          a Molecular or quasi-molecular ion peak; b FR: Fraxinus rhynchophylla; AS: Artemisia scoparia; PL: Paeonia lactiflora; SD: Saposhinikovia divaricata; GU: Glycyrrhiza uralensis; CR: Citrus reticulata; CC: Coptis chinensis; PA: Phellodendron amurense; SC: Schisandra chinensis; MO: Magnolia officinalis.

                          The stability results showed that the concentrations of these compounds did not change significantly from the date of production (day 0) to the last day of analysis, confirming the chemical stability of the IBS-20 formula under the storage conditions (Figure 5).
                          http://static-content.springer.com/image/art%3A10.1186%2F1749-8546-5-8/MediaObjects/13020_2009_Article_67_Fig5_HTML.jpg
                          Figure 5

                          Stability of the IBS-20 formula. The ratio was calculated by the content of the marker at the date of measurement to that at the starting date.

                          Conclusion

                          A QA/QC program involving good supply practice acquisition, botanical validation, chemical profiling of the component herbs, as well as the establishment of a chemical standardization protocol and stability monitoring has been implemented on a 20-herb botanical preparation, the IBS-20 formula. The results of this study demonstrate that it is possible to establish a QA/QC program to monitor the quality of poly-herbal formulations employing botanical and chemical methods. In particular, the generation of a fingerprint HPLC chromatographic protocol in which the identities of a series of appropriate marker compounds, including relevant biologically active constituents, were identified for use in product standardization, coupled with a stability study procedure involving the LC-MS quantitation of major chemical markers, represent major advances in the development of quality control methods for poly-herbal Chinese medicine products for clinical studies and therapy.

                          Abbreviations

                          ADM: 

                          absolute deviation from mean

                          APCIMS: 

                          atmospheric pressure chemical ionization mass spectrometry

                          CP: 

                          Pharmacopoeia of the People's Republic of China

                          DAD: 

                          diode array detection

                          GMP: 

                          good manufacturing practice

                          HKCMMS: 

                          Hong Kong Chinese Materia Medica Standard

                          HPLC: 

                          high-performance liquid chromatography

                          IBS: 

                          irritable bowel syndrome

                          ICP-MS: 

                          inductively coupled plasma-mass spectrometry

                          GS: 

                          gas chromatography

                          LC-MS: 

                          liquid chromatography-mass spectrometry

                          NMR: 

                          nuclear magnetic resonance

                          QA: 

                          quality assurance

                          QC: 

                          quality control

                          TLC: 

                          thin-layer chromatographic

                          UV: 

                          ultra violet

                          WHO: 

                          World Health Organization.

                          Declarations

                          Acknowledgements

                          This study was supported by a grant (number 1-U19-AT003266) from the National Center for Complementary and Alternative Medicine, National Institutes of Health, USA. This study does not necessarily represent the official views of NCCAM. The authors acknowledge all members of this international collaborative project for their efforts.

                          Authors’ Affiliations

                          (1)
                          School of Chinese Medicine, Chinese University of Hong Kong
                          (2)
                          Department of Medicine and Therapeutics, Chinese University of Hong Kong
                          (3)
                          Centre for Complementary Medicine Research, University of Western Sydney
                          (4)
                          Center for Integrative Medicine, University of Maryland School of Medicine
                          (5)
                          Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago

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                          © Ip et al; licensee BioMed Central Ltd. 2010

                          This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​2.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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