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. 2022 Jul 14;17(7):e0271444. doi: 10.1371/journal.pone.0271444

Fig 1. Chromatogram of B vitamins standards and internal standards at (500 μg/L).

Fig 1

Peak identification: 1—IS-B3 (Stable isotope labelled internal standard), 2—B3 (Niacin), 3—B1 (Thiamine), 4 - B6-5P (Pyridoxal 5-phosphate), 5—B6 (Pyridoxine), 6 - B3-AM (Niacinamide), 7—IS-B5 (Stable isotope labelled internal standard), 8—B5 (Pantothenic acid), 9 - B6-4PA (4-Pyridoxic acid), 10 - B9-THF (Tetrahydrofolic acid), 11—B12 (Cyanocobalamine), 12—B9 (Folic acid), 13—IS-B7 (Stable isotope labelled internal standard), 14—B7 (Biotin), 15—B2 (Riboflavin).