Discussion Category: LC-MS Systems
I am using the QTRAP 4000 to determine the metabolites of arachidonic acid. I did this experiment three years ago, I got good results. This year, when I used the same methods I saved three years ago, use same LC condition, the sensitivities of the peaks were reduced by almost 5-6 folds. I order new column, new solvents, no improvement.
Thank you for your help.
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