Abstract
Previous studies in our laboratory [1,2] indicated the existence of ceramides and ceramide monochexosides in brown rice grain. More recently, we have obtained evidence for the presence of these and other sphingolipids (ceramide dihexosides and ceramide trihexosides) in rice bran. The present paper describes in detail the isolation and the chemical analysis of the constituents of ceramides and ceramide monohexosides in rice bran. (1) Ceramide, ceramide monohexoside, ceramide dihexoside and ceramide trihexoside were detected in rice bran. The ceramide and ceramide monohexoside fractions were isolated and their constituents were analysed. (2) In the ceramide the fatty acid components consisted of three types: normal, 2-hydroxy and 2,3-dihydroxy acids, mainly 2-hydroxylignoceric acid. The major long-chain base components were trihydroxy bases, principally 4-hydroxysphinganine. (3) The principal fatty acid and long-chain base components in the ceramide monohexoside were 2-hydroxyarachidic acid and sphinga-4,8-dienine isomers and 4-hydroxy-8-sphingenine. The component sugar was mostly glucose.
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