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The novel derivative of quercetin 3′- O -(3-chloropivaloyl)quercetin (CPQ) inhibited  α -glucosidase in a non-competitive manner with an efficacy exceeding that of the parent quercetin. In addition, it inhibited aldose reductase isolated from rat lenses with an IC 50  in the low micromolar range and attenuated sorbitol accumulation in isolated rat eye lenses with an activity comparable with that of quercetin. Moreover, it scavenged stable free-radicals of DPPH more efficiently than did quercetin. By inhibiting  α -glucosidase and affecting both the polyol pathway and oxidative stress, CPQ represents a promising agent for the multi-targeted pharmacology of diabetic complications.

3′- O -(3-Chloropivaloyl)quercetin, α -glucosidase inhibitor with multi-targeted therapeutic potential in relation to diabetic complications