Biotransformation of 5,7-Methoxyflavones by Selected Entomopathogenic Filamentous Fungi
Mateusz Łużny , Tomasz Tronina , Ewa Kozłowska , Edyta Kostrzewa-Susłow , Tomasz Janeczko
Abstract5,7-Dimethoxyflavone, a chrysin derivative, occurs in many plants and shows very low toxicity, even at high doses. On the basis of this phenomenon, we biotransformed a series of methoxy-derivatives of chrysin, apigenin, and tricetin obtained by chemical synthesis. We used entomopathogenic fungal strains with the confirmed ability of simultaneous hydroxylation/demethylation and glycosylation of flavonoid compounds. Both the amount and the place of attachment of the methoxy group influenced the biotransformation rate and the product’s amount nascent. Based on product and semi-product structures, it can be concluded that they are the result of cascading transformations. Only in the case of 5,7,3′,4′,5′-pentamethoxyflavone, the strains were able to attach a sugar molecule in place of the methoxy substituent to give 3′-O-β-d-(4″-O-methylglucopyranosyl)-5,7,4′,5′-tetramethoxyflavone. However, we observed the tested strains’ ability to selectively demethylate/hydroxylate the carbon C-3′ and C-4′ of ring B of the substrates used. The structures of four hydroxyl-derivatives were determined: 4′-hydroxy-5,7-dimethoxyflavone, 3′-hydroxy-5,7-dimethoxyflavone, 3′-hydroxy-5,7,4′,5′-tetramethoxyflavone, and 5,7-dimethoxy-3′,4′-dihydroxyflavone (5,7-dimethoxy-luteolin).
|Journal series||Journal of Agricultural and Food Chemistry, ISSN 0021-8561, e-ISSN 1520-5118, (N/A 140 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||biotransformation; Beauveria sp.; Isaria sp.; methoxyflavones; 5,7-dimethoxyflavone; 4-O-methyloglycosylation|
|Score||= 140.0, 17-05-2021, ArticleFromJournal|
|Publication indicators||= 0; = 0; : 2018 = 1.321; : 2019 = 4.192 (2) - 2019=4.289 (5)|
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