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Table 1 Solubility of some TCM active components in water and ethanol

From: Research progress on the ethanol precipitation process of traditional Chinese medicine

Component category

Active component

Solubility in water

Solubility in ethanol

Unit of solubility

Temperature/ °C

References

Phenolic acids

Rosmarinic acid

1.35 × 10−2

2.68 × 10−1

mol/mol

20

[11]

Gallic acid

1.07

23.7

g/100 g

25

[12]

Gentisic acid

2.20

45.5

g/100 g

25

[12]

Phenols

2-Naphthol

0.00

2.49 × 10−1

mol/mol

20

[13]

Catechol

7.52 × 10−2

3.57 × 10−1

mol/mol

20

[13]

Hydroquinone

1.02 × 10−2

1.88 × 10−1

mol/mol

20

[13]

Curcumin

2.15 × 10−8

6.62 × 10−4

mol/mol

20

[14]

trans-Resveratrol

2.90 × 10−6

1.56 × 10−2

mol/mol

20

[15]

Flavonoids

Apigenin

7.00 × 10−7

2.44 × 10−4

mol/mol

15

[16]

Baicalein

6.63 × 10−6

1.04 × 10−3

mol/mol

20

[17]

Chrysin

1.26 × 10−5

6.89 × 10−3

mol/mol

20

[18]

Genistein

5.30 × 10−6

3.74 × 10−2

mol/L

25

[19]

Luteolin

1.75 × 10−6

1.88 × 10−3

mol/mol

25

[20]

Hesperetin

2.40 × 10−6

7.30 × 10−2

mol/L

20

[21]

Hesperidin

1.42 × 10−7

3.08 × 10−5

mol/mol

20

[22]

Naringenin

6.62 × 10−7

9.20 × 10−3

mol/mol

20

[23]

Naringin

9.76 × 10−7

3.98 × 10−5

mol/mol

20

[24]

Daidzin

4.10 × 10−6

3.97 × 10−4

mol/mol

20

[25]

Daidzein

6.08 × 10−8

2.70 × 10−4

mol/mol

20

[26]

Alkaloids

Piperine

1.07 × 10−5

8.99 × 10−3

mol/mol

25

[27]

Coumarins

Osthole

4.86 × 10−7

1.75 × 10−2

mol/mol

20

[28]

Isoimperatorin

7.42 × 10−7

3.77 × 10−3

mol/mol

20

[29]