既然分离的化合物是多肽类,建议采用TFA体系,同时考虑到运用pH gradient HPLC方法,所以可尝试:
mobile phase:A1:0.01%TFA水溶液(V/V,pH=2.84),A2:0.10%TFA水溶液(V/V,pH=2.03) B;乙腈,A/B=60/40, gradient:10min内,由A1/B=60/40变为A2/B=60/40
试试这个体系,看是什么情况?
Effects of TFA Concentrations on HPLC
另外,pH gradient HPLC法分离多肽,可以参考一下相关文献。
pH gradient reversed-phase liquid chromatography as a fractionation tool for the separation of peptides
cuturl('http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6THP-4PYYTNG-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=2cab8269d63d53b9a610291caf9fbf6f')