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K oshy et al .: J ournal of AOAC I nternational V ol . 99, N o . 6, 2016  1455

Table 8. Precision of retention time of standards

Retention time

Compound

Concn, μg/mL

Mean, min

RSD r

, %

N

W-IV

1321

5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5

15.51 15.56 15.53 15.52 15.52 15.50 15.47 19.70 19.73 19.72 19.70 19.72 19.66 19.65 20.35 20.39 20.38 20.36 20.36 20.34 20.32 21.37 21.40 21.39 21.38 21.37 21.36 21.35 22.22 22.26 22.25 22.24 22.24 22.22 22.22 25.52 25.54 25.54 25.53 25.53 25.52 25.51

0.02 0.62 0.54 0.12 0.05 0.08 0.05 0.04 0.55 0.46 0.07 0.40 0.03 0.06 0.04 0.49 0.41 0.06 0.06 0.03 0.05 0.03 0.38 0.32 0.05 0.05 0.02 0.04 0.02 0.34 0.29 0.05 0.05 0.02 0.04 0.02 0.21 0.19 0.03 0.04 0.03 0.01

661 330 165

83

41.3 20.6 1201

W-V

600 300 150

75

37.5 18.8 1475

WF-A

738 369 184

92

46.1 23.1 1421 711 355 178 88.8 44.4 22.2 1382

12-D

W-A

691 346 173

86

43.2 21.6 1350

W-B

675 338 169

84

42.2 21.1