A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt. 75), alanine and phenylalanine. Glycine contributes 47.0 % to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is
Text Solution
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6
Sol. Molecular weight of decapeptide = 796 g/mol
Total bonds to be hydrolysed = (10 – 1) = 9 per molecule
Total weight of H 2 O added = 9 × 18 = 162 g/mol
Total weight of hydrolysis product = 796 + 162 = 958 g
Total weight % of glycine (given) = 47%
Total weight of glycine in product = 
= 450 g
Molecular weight of glycine = 75 g/mol
Number of glycine molecule = 
= 6
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