Abstract
Hydrolysis of steroidal ester by malt enzyme shows selectivity, not only to the position of the ester but also to difference in the acyl group. Such selectivity could be summarized as follows:1) Ester group in the 21-position which submit to hydrolysis are the esters of straight-chain aliphatic carboxylic acid, lower dibasic aliphatic carboxylic acid, and N-substituted amino acid.2) Ester group in the 21-position which does not submit to hydrolysis are esters of aromatic carboxylic acid, dibasic aliphatic carboxylic acid with a large number of carbon atoms, carbonic acid, and tertiary carboxylic acid.3) Of the esters of secondary hydroxyl in 17-position, formate and acetate are hydrolyzed but not propionate.4) Formate and acetate in 3-position are not hydrolyzed.
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