Abstract
The degradation of several penicillins in unbuffered aqueous solution produces N-formylpenicillamine, in some cases in high yield. Very little or no penicillamine is formed under these conditions. N-Formylpenicillamine was produced from benzylpenicillin at pH values between 2.5 and 7, with a maximum yield of 30% at pH 5, whereas penicillamine was produced only at pH 5 or below in a yield of less than 1%. Benzylpenicillenic acid at pH 5 gave a 20% yield of N-formylpenicillamine and no penicillamine whereas benzylpenicilloic, penilloic and penillic acids gave no N-formylpenicillamine and a small amount of penicillamine.
摘要:在非缓冲的水溶液中,多种青霉素会降解生成N-甲酰基青霉胺,有时产率很高。在这些条件下,几乎不会形成青霉胺。在pH值为2.5至7之间,苯青霉素可以产生N-甲酰基青霉胺,最大产率为30%,而青霉胺仅在pH 5或以下产生,产率不到1%。在pH 5下,苯青霉素酸可以产生20%的N-甲酰基青霉胺,而没有青霉胺,而苯青霉酸、青霉酸和青霉烯酸则不产生N-甲酰基青霉胺,只产生少量青霉胺。