2026-04-18T05:56:19Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/980512025-12-04T19:38:22Zcom_2072_1057col_2072_478813col_2072_478917

00925njm 22002777a 4500 dc Para, B. V. (Bianca Veronica) author Núñez Burcio, Oscar author Moyano Morcillo, Encarnación author Galcerán Huguet, M. Teresa author 2016-04-29T11:18:30Z 2016-04-29T11:18:30Z 2006-05-30 2016-04-29T11:18:36Z Conditions for the separation and determination of benzalkonium chloride (BAC) homologues by CE with UV-detection and CE coupled to MS (IT) using electrospray as ionization source were established. The separation was performed using fused-silica capillaries of 50 μm id and 100 mM acetic acid-ammonium acetate buffer solution at pH 4.5 with 80% of ACN as carrier electrolyte. CE-MS coupling parameters were optimized and methanol-10 mM acetic acid (90:10 v/v) was selected as sheath liquid. Detection limits, based on an S/N of 3:1, were calculated, and values between 0.8 and 1.3 mg/L with CE-ESI/MS and around 0.5 mg/L with CE-ESI-MS/MS, using hydrodynamic injection (15 s, 3.5 kPa), were obtained. Good run-to-run and day-to-day precisions on concentration were achieved with RSDs lower than 8%. Quantitative analysis was carried out by the internal standard method and the calibration curves showed good linearities (r2>0.98). The CE-ESI-MS/MS method was successfully applied to the analysis of BAC in different ophthalmic solutions, allowing the direct determination, identification and confirmation of the BAC homologues presented in these samples. Electroforesi capil·lar Capillary electrophoresis Análisis of Benzalkonium chloride by capillary electrophoresis-electrospray-Tandem mass spectrometry