Isolation and structure of diglycosylsterols and triglycosylsterols in rice bran.

Abstract

Novel oligoglycosylsterols, a series of sterylglycosides, were detected in the glycolipids of rice bran, and di- and triglycosylsterols were isolated and their structures were investigated. The principal sterol components were sitosterol, campesterol and stigmasterol; glucose was the only component sugar. The major species of diglycosylsterol and triglycosylsterol were characterized as D-glucopyranosyl-(beta 1 leads to 4)-D-glucopyranosyl-(beta 1 leads to 3')-sitosterol, i.e. cellobiosylsitosterol, and D-glucopyranosyl-(beta 1 leads to 4)-D-glucopyranosyl-(beta 1 leads to 4)-D-glucopyranosyl-(beta 1 leads to 3')-sitosterol, i.e. cellotriosylsitosterol, respectively.