求教:GC-MS同位素标记定量?-14 11:53:41可以不管是不是前体饲喂什么的,就看最后检测到的产物,也是不对的啊比如第一个化合物alanine分子量是89,他的target ion却是221,无法理解... 转变成其他物质了。All of the polyamine cations identified in this experiment (putrescine, cadaverine, lysine, spermine and spermidine) and most of the anionic metabolites ,查看更多