The sulfated flavonoids in Polygonum hydropiper showed potent inhibiton against lens aldose reductase. Among these flavonoids isorhamnetin 3,7-disulfate (5) was most potent. Kinetic analysis showed that 5 exhibited noncompetitive inhibition against both dl-glyceraldehyde and NADPH.
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Haraguchi et al. (1996) studied this question.
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