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Give classification of oligosaccharides. |
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Answer» SOLUTION :The oligosaccharides are classified as follows : (i) Disaccharides These carbohydrates produce two monosaccharide units on hydrolysis. For example, sucrose produces glucose unit and fructose unit on hydrolysis, maltose produces two units of glucose and lactose produces one glucose and one GALACTOSE unit on hydrolysis. Thus, sucrose, maltose and lactose are called disaccharides. The general formula of disaccharide is `C_(n)H_(2n-2)O_(n-1)` (ii) Trisaccharides : These carbohydrates produce three units of monosaccharide on hydrolysis. For example, Raffinose `(C_(18)H_(32)O_(16))` is a TRISACCHARIDE. On hydrolysis, raffinose give one unit each of glucose, fructose and galactose. The general formula of trisaccharides is `C_(n)H_(2n-4)4O_(n-2)` (iii) Tetrasaccharides : These carbohydrates produce four units of monosaccharide on hydrolysis. For example, stachyose `C_(24)H_(42)O_(21)` produces two units of galactose, one unit each of glucose and fructose on hydrolysis. The general formula of tetrasaccharide is `C_(n)H_(2n-6)4O_(n-3)`. |
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