Screening study of the antihyperglycemic action of new solid quercetin dispersions

Abstract

The aim – to screen new solid dispersions of quercetin for the presence of antihyperglycemic action and to identify the most active substances that are promising for the creation of antidiabetic drugs.
 Materials and methods. The object of the study was 4 new solid dispersions of quercetin, developed at the National University of Pharmacy. Solid dispersions of quercetin were prepared by the liquid-phase method; hydroxypropyl methylcellulose (HPMC) or polyvinylpyrrolidone (PVP) in ratios of 1:1 and 1:2 were used as a carrier. The antihyperglycemic effect of the studied substances at a dose of 50 mg / kg was assessed in rats by the ability to lower blood glucose levels after carbohydrate loading in a model of impaired glucose tolerance induced by dexamethasone and in experimental type 2 diabetes mellitus induced by dexamethasone.
 Results. It was found that with impaired glucose tolerance, a solid dispersion of quercetin with HPMC (1:1) showed a pronounced antihyperglycemic effect – the glucose level 30 minutes after glucose load significantly decreased by 28 % and did not differ from the action of metformin, which was confirmed by the value of the area under glycemic crooked. When solid dispersions with PVP (1:1 and 1:2) were used, the antihyperglycemic effect was less pronounced. In a model of type 2 diabetes mellitus, a significant antihyperglycemic effect was found only in a solid dispersion of quercetin with HPMC (1:1) at the metformin level, which indicates an increase in the solubility and absorption of quercetin.
 Conclusions. A pronounced antihyperglycemic effect at the metformin level was found in a solid dispersion of quercetin with HPMC in a 1:1 ratio with impaired glucose tolerance and type 2 diabetes mellitus. It has been proven that a solid dispersion of quercetin with HPMC is a promising substance for creating a monocomponent drug or for inclusion in a new antidiabetic combined drug