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Reaction kinetics for the reactions between four polyphenols (trans-resveratrol, apigenin, kaempferol and fisetin) and methylglyoxal (MGO) were determined at pH 7.4 and 37 °C, and the effect of functional groups of polyphenols on MGO trapping ability was examined. Reaction products of polyphenols with MGO were characterized by HPLC-MS/MS. The apparent second order rate constants for the reaction of MGO with trans-resveratrol, apigenin, kaempferol and fisetin were (2.7 ± 0.2) × 10-2 M-1 s-1, (4.4 ± 0.4) × 10-3 M-1 s-1, (6.3 ± 0.2