风烟回复于2008/06/08
估计如1楼老师所讲,导致您的柱子有了问题,所以才会出现这样的峰。
现在的话,先冲洗柱子吧:
用乙腈冲柱子,在您平时的流速的一半左右,想必要比较长的时间,把缓冲盐冲干净后,再用吧。
如果冲它个一两天还是不见效果,就倒过来冲洗,接着倒着使用吧,像这样的情况,倒着冲应该是有效果的。
hrcren回复于2008/06/08
就是跟三楼的附件说的一样,加入一定量的三乙胺或醋酸能够抑制HPLC峰拖尾
maxtall回复于2008/06/08
the file from upstair is great:
Correcting Peak Tailing Problems in Reversed Phase HPLC
Peak tailing in reversed phase HPLC continues to be a common complaint. It is particularly prevalent when
separating basic compounds and, therefore, a source of constant problems to those analyzing pharmaceutical
compounds by HPLC.
Peak tailing causes a number of problems, including lower resolution, reduced sensitivity, and poorer
precision and quantitation. Figure 1 illustrates how resolution between peaks and sample sensitivity is
negatively affected by peak tailing. Figure 2 illustrates how accuracy and precision of an analysis can suffer
because of the inability of data systems to identify exactly where a tailing peak begins and ends.