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Glucosylation of Quercetin by Recombinant UGT71G1.
(A) HPLC trace showing the substrate quercetin (Q) and the five products (numbered 1 to 5). Solid line, complete reaction mixture; dashed line, standards for quercetin (Q), quercetin-3-O-glucoside (peak 3), and quercetin-4′-O-glucoside (peak 4). mAU, milli-absorption unit.
(B) UV absorption spectra of quercetin (Q) and products 1 to 5.
