L-Carnitine is often formulated with tartrate as counterion which in this application would have been coeluting with the structurally similar compound maleate, but fortunately that anion is not present in formulations of carnitine. The generic method used in this application was developed to enable analysis of the fifteen most common counterions used in pharmaceuticals and dietary supplements within 35 minutes, using an isocratic carbonate-based eluent.
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