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method development

Posted: Wed Aug 25, 2010 9:24 pm
by Bobo
Hi everyone
I am looking for a method for the drug rapamycin,I am currently experiencing fronting. Mobile phase:MeOH\H2O dissolving in MeCN tried flow rates 0.5-1ml/min also tried using buffer with no success.any ideas on what I can do to move foward?