Table 4 Contents of 11 representative components in the WDD material reference and its commercial preparations (μg/g, n = 3)

Material reference

MR1

26.32 ± 6.24

778.62 ± 8.23

22.73 ± 9.62

6.63 ± 8.75

940.44 ± 7.89

5.64 ± 1.76

10645.14 ± 6.20

978.32 ± 9.04

3512.26 ± 9.61

1710.79 ± 8.24

1.63 ± 9.85

MR2

37.68 ± 9.56

897.79 ± 9.65

17.96 ± 9.03

6.98 ± 9.58

852.53 ± 4.50

6.06 ± 4.67

11941.18 ± 3.13

1084.67 ± 9.82

3687.64 ± 5.16

982.64 ± 8.93

1.03 ± 9.61

MR3

31.54 ± 9.18

814.52 ± 5.38

24.91 ± 5.40

6.81 ± 8.64

944.60 ± 6.19

5.38 ± 1.34

5452.55 ± 9.40

374.48 ± 6.28

2018.17 ± 9.27

1181.69 ± 3.90

0.97 ± 9.92

MR4

25.25 ± 9.51

854.40 ± 4.86

24.85 ± 5.78

6.05 ± 8.96

853.63 ± 7.28

5.02 ± 1.95

8046.00 ± 9.87

686.94 ± 8.10

2934.56 ± 9.77

701.07 ± 5.05

0.58 ± 9.64

MR5

21.73 ± 9.40

595.87 ± 9.29

21.66 ± 9.69

5.91 ± 8.02

556.13 ± 7.54

4.82 ± 7.74

8490.68 ± 6.31

478.75 ± 9.53

2565.42 ± 5.28

1286.23 ± 4.31

2.59 ± 8.49

MR6

27.37 ± 7.79

651.39 ± 1.99

30.18 ± 9.72

5.67 ± 7.02

446.18 ± 8.41

4.82 ± 7.74

8490.68 ± 6.31

478.75 ± 9.53

2565.42 ± 5.28

1259.08 ± 4.31

2.77 ± 8.49

MR7

31.46 ± 7.24

634.51 ± 9.88

20.72 ± 7.13

8.18 ± 9.36

455.35 ± 6.84

2.68 ± 9.34

8541.90 ± 9.51

629.97 ± 9.92

2641.52 ± 6.76

1214.65 ± 8.67

2.33 ± 9.13

MR8

25.21 ± 9.47

750.37 ± 6.11

13.97 ± 8.87

13.49 ± 9.80

428.60 ± 4.30

3.15 ± 9.69

7405.05 ± 9.01

676.53 ± 9.70

2020.22 ± 8.44

1101.30 ± 9.31

3.87 ± 9.85

MR9

19.27 ± 7.98

854.40 ± 6.16

18.42 ± 8.76

6.39 ± 8.42

431.26 ± 4.66

2.05 ± 8.16

9073.31 ± 5.13

764.35 ± 8.39

2892.98 ± 6.78

553.54 ± 6.78

2.43 ± 8.30

MR10

25.92 ± 9.14

666.82 ± 2.95

24.84 ± 6.06

17.05 ± 8.33

1683.29 ± 8.35

6.75 ± 8.15

19814.33 ± 3.75

2150.99 ± 5.38

6442.32 ± 4.58

2469.72 ± 4.70

1.44 ± 8.39

MR11

26.90 ± 5.02

678.86 ± 9.20

25.21 ± 3.45

15.03 ± 8.24

955.20 ± 7.86

6.83 ± 3.68

19690.75 ± 6.61

2027.77 ± 3.13

6542.79 ± 2.46

2645.80 ± 2.46

1.32 ± 718

MR12

28.84 ± 7.53

783.21 ± 7.54

24.34 ± 6.90

15.50 ± 5.97

1213.88 ± 1.24

6.38 ± 7.41

17382.59 ± 6.69

1786.87 ± 9.62

5731.72 ± 6.73

2215.76 ± 5.21

1.53 ± 4.01

MR13

26.54 ± 9.69

787.23 ± 2.34

13.87 ± 8.80

8.04 ± 7.49

1115.40 ± 8.43

4.74 ± 9.06

18122.54 ± 9.88

1446.26 ± 9.37

5297.31 ± 9.54

1970.65 ± 8.66

2.33 ± 9.94

MR14

22.35 ± 8.91

849.69 ± 2.71

13.12 ± 6.78

7.52 ± 9.18

574.23 ± 9.60

2.05 ± 9.26

13742.52 ± 6.01

1302.74 ± 1.90

4513.54 ± 1.04

1325.38 ± 4.07

1.52 ± 9.94

MR15

21.13 ± 9.11

757.98 ± 5.71

9.67 ± 8.64

5.52 ± 8.93

292.25 ± 9.63

1.00 ± 9.78

9695.17 ± 9.63

850.53 ± 8.59

3309.01 ± 7.41

714.09 ± 8.27

0.89 ± 9.78

AVG

26.50

749.39

20.43

8.98

782.86

4.49

11768.96

1047.86

3778.33

1422.16

1.82

RSD (%)

17.64

11.78

28.16

45.11

48.32

41.45

40.68

54.80

41.02

45.40

48.73

Commercial preparations

CP1

0.016 ± 5.17

143.53 ± 9.86

11.33 ± 9.16

7.36 ± 8.96

257.59 ± 7.22

0.84 ± 8.77

ND

1649.58 ± 8.83

ND

3334.92 ± 8.61

2.48 ± 6.28

CP2

4.08 ± 4.55

51.01 ± 6.04

6.85 ± 9.02

5.28 ± 7.39

106.52 ± 9.97

0.27 ± 7.77

2027.77 ± 9.63

680.69 ± 7.17

ND

1424.23 ± 5.74

1.08 ± 7.60

CP3

ND

366.32 ± 8.23

8.74 ± 1.37

6.58 ± 3.55

533.87 ± 2.34

5.64 ± 4.44

ND

1216.69 ± 4.93

ND

2309.10 ± 6.02

ND

CP4

1.52 ± 7.86

ND

ND

5.12 ± 8.36

155.13 ± 7.83

0.53 ± 8.56

888.34 ± 9.22

237.94 ± 3.06

3236.89 ± 5.21

721.03 ± 8.80

ND

CP5

38.56 ± 8.45

738.06 ± 7.90

76.77 ± 7.36

7.70 ± 8.58

2568.08 ± 4.69

3.15 ± 9.47

20406.24 ± 3.19

1719.75 ± 3.94

8810.34 ± 2.20

3915.97 ± 2.84

0.020 ± 9.20

CP6

1.70 ± 9.02

ND

ND

5.23 ± 5.20

121.15 ± 9.97

0.99 ± 7.60

7456.44 ± 4.29

496.46 ± 4.04

2897.91 ± 4.11

959.36 ± 5.74

ND

CP7

7.78 ± 9.25

ND

16.68 ± 7.56

7.34 ± 8.53

1251.99 ± 9.28

1.04 ± 9.69

7700.01 ± 8.31

957.48 ± 7.88

3236.89 ± 5.21

2193.21 ± 8.71

0.28 ± 5.70

CP8

9.02 ± 5.75

119.13 ± 6.85

10.04 ± 8.61

15.42 ± 9.01

880.37 ± 7.96

5.64 ± 5.93

15756.12 ± 9.63

1280.16 ± 9.37

5432.06 ± 8.56

1500.00 ± 6.39

5.21 ± 4.49

AVG

8.95

283.61

21.73

7.50

734.34

2.26

9039.15

1029.84

4722.82

204.73

1.81

RSD (%)

150.50

98.81

124.99

44.89

115.38

99.86

84.86

51.86

52.89

55.05

117.09

CP8-material reference^a

RSD (%)

24.74

25.23

31.01

45.09

46.42

39.91

39.37

52.50

40.01

43.73

59.39