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Vitamin C Activity in Guinea Pigs of 6-O-Acyl-2-O-α-D-glucopyranosyl-L- ascorbic Acids with a Branched-acyl Chain

A series of novel acylated ascorbic acid derivatives, 6-O-acyl-2-O-α-D-glucopyranosyl-L-ascorbic acids with a branched-acyl chain (6-bAcyl-AA-2G) were recently developed in our laboratory as stable and lipophilic ascorbate derivatives. In this study, the bioavailability of 6-bAcyl-AA-2G was investigated in guinea pigs. Various tissue homogenates from guinea pigs hydrolyzed 6-bAcyl-AA-2G to give ascorbic acid (AA), 2-O-α-D-glucopyranosyl-L-ascorbic acid (AA-2G), and 6-O-acyl AA. The releasing pattern of the three hydrolysates suggested that 6-bAcyl-AA-2G was hydrolyzed via 6-O-acyl AA to AA as a main pathway and via AA-2G to AA as a minor pathway. The former pathway seems to be of advantage, because 6-O-acyl AA, as well as AA, can have vitamin C activity. In addition, we found that a derivative with an acyl chain of C12, 6-bDode-AA-2G, had a pronounced therapeutic effect in scorbutic guinea pigs by its repeated oral administrations. These results indicate that 6-bAcyl-AA-2G is a readily available source of AA in vivo, and may be a promising antioxidant for skin care and treatment of diseases associated with oxidative stress.