Citation:
Ya Shan HAN, Xiao Qing SONG, Jin Cheng ZHAO, Yun Qing DAI. SIMULTANEOUS DETERMINATION OF VITAMIN B COMPLEX (THIAMINE, RIBOFLAVIN, NIACIN, PYRIDOXINE AND FOLIC ACID) IN FOODS BY HPLC[J]. Chinese Chemical Letters,
;1991, 3(8): 645-648.
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A high performance liquid chromatographic assay has been developed for the simultaneous determination of five water soluble vitamins:thimine, riboflavin, niacin, pyridoxine and folic acid in cereal products and fresh vegetables. Food samples were hydrolyzed in 0.4 mol/L HCl, autoclaved at 120℃ 15 psi for 20 minutes, using a μ-Bondapak column (3.9×300mm, Waters Co.), a mobile phase of methanol-water (30:70) (0.005 mol/L heptanesulfonic acid) and a flow rate of 1.0 ml/min gave the most satisfactory separation of the five water soluble vitamins. A double channel deteetion was used: four vitamins (B5, folic acid, B2, B1) were detected hy UV spectrophotometry (254 nm) first, pyridoxine (B6) was detected by fluoromelry (EX 290nm, EM 395 nm) afterwards. Detection limits were 2, 5, 5, 2 and 5ng, linear ranges were 5-10ng, 5-50ng, 5-40ng, 5-50ng and 10-50ng for B1, B2, B5, B6 and folic acid respectively. Recoveries were 92-100%(B5), 51-52% (folic acid), 103-105% (B2), 99-100% (B6) and 91.3-102% (B1) respectively. In comparison with a reference method and checking with food composition tables, very satisfactory results were obtained by this method.
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