Das B C, Varenne P, Taylor A
J Antibiot (Tokyo). 1979 Jun;32(6):569-74. doi: 10.7164/antibiotics.32.569.
The chemical ionisation mass spectra of seven naturally occurring depsipeptides and some of their permethylated derivatives have been measured. The primary ionisation process involves an ester group and not an amide or other functionality. It probably occurs randomly when the molecule contains more than one ester link. Unlike electron impact mass spectra, those obtained under chemical ionisation conditions gave sequence information for all of the depsipeptides examined or their permethylated derivatives. A mechanism for the primary fragmentation is proposed.
已测定了七种天然存在的缩肽及其一些全甲基化衍生物的化学电离质谱。主要电离过程涉及酯基而非酰胺或其他官能团。当分子含有多个酯键时，这种电离可能随机发生。与电子轰击质谱不同，在化学电离条件下获得的质谱给出了所有被测缩肽或其全甲基化衍生物的序列信息。本文提出了主要裂解的机制。
