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Abstract
Histamine plays an important pathophysiological role in allergy, inflammation, gastric acid secretion, microcirculation and neurotransmission. 3-Methylhistamine is a prominent metabolite of histamine. Different methods for determination of histamine in biological fluids have been developed. In the present study, a simple, simultaneous determination of histamine and 3-methylhistamine by HPLC (precolumn derivatization with fluorescamine) was developed in human plasma using fluorescence detection with 1-methylhistamine as the internal standard. Linear regression analysis of the ratios of the concentrations of histamine and 3-methylhistamine (X) against peak height ratios (Y) yielded the following: y = 0.0073x − 0.0096 (R 2 = 0.990) and y = 0.0077x − 0.0111 (R 2 = 0.989). In conclusion, it was possible to detect histamine and 3-methylhistamine below 5 ng mL−1 in 1 mL plasma.