Development and validation of a LC-HESI MS/MS method to detect and quantify N-nitrosamines in Valsartan.
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Abstract
In the present study, a robust, efficient and sensitive LC-HESI-MS/MS method was developed and validated to simultaneously detect and quantify 5 N-nitrosamines (N-nitrosodiethylamine, N-nitrosoethylisopropylamine, N-nitrosodiisopropylamine, N-nitrosodibutylamine and N-nitrosomethylaminobutyric acid) in Valsartan, an active ingredient of the Sartan family. Chromatographic separation was achieved with an Accuore C18 column (2.6 µm, 150 x 3 mm) with gradient elution using 0.1% formic acid in water (mobile phase A) and methanol (mobile phase B). The limits of detection and quantification of N-nitrosamines ranged from 0.0337 to 0.0628 ng/mL and 0.1022 to 0.2370 ng/mL, respectively, demonstrating the high sensitivity and quantitative capability of the method. The recovery of N-nitrosamines ranged from 70% to 130%, and the repeatability and intermediate precision had coefficients of variation less than 10%, evaluated on the Pertena Complete product containing 3 active pharmaceutical ingredients (Amlodipine, Hydrochlorothiazide and Valsartan). Calibration curves were constructed in a range of 1.0 to 15.0 ng/mL, obtaining coefficients of determination (R2) greater than 0.995. Statistics played a crucial role in this study, allowing the determination of the precision, accuracy and reliability of the method through analysis of variance, linearity studies and the construction of confidence intervals. This study confirms the safety of the Pertena Complete product, manufactured by Prophar SA, and highlights the effectiveness of the method for an accurate and reliable analysis of the active pharmaceutical ingredient.
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