Fig. 1. Flavin compounds present in (A) standard solution [FAD, FMN, and riboflavin (Rbfl)], and in C. sativus nutrient solution cultivated under (B) iron-deficient and (C) iron-sufficient conditions.
![Fig. 1. Flavin compounds present in (A) standard solution [FAD, FMN, and riboflavin (Rbfl)], and in C. sativus nutrient solution cultivated under (B) iron-deficient and (C) iron-sufficient conditions.](/cms/asset/468bcfb3-5e86-4e38-a972-50404505c626/tbbb_a_1095070_f0001_b.gif)
Fig. 2. MS/MS spectrum of riboflavin (A) and an unidentified flavin compound (B) in the positive ionization mode.
Fig. 3. Structure of riboflavin (A) and 4′-ketoriboflavin (B) as determined using 1H NMR (C), 13C NMR (D), NOESY (E), and HMBC (F).
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