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Analysis of benzalkonium chloride by capillary electrophoresis‐tandem mass spectrometry
Author(s) -
Para Bianca Veronica,
Núñez Oscar,
Moyano Encarnación,
Galceran Maria Teresa
Publication year - 2006
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200500716
Subject(s) - chromatography , chemistry , benzalkonium chloride , capillary electrophoresis , mass spectrometry , electrospray ionization , detection limit , ammonium acetate , acetic acid , ammonium chloride , electrospray , capillary electrophoresis–mass spectrometry , tandem mass spectrometry , analytical chemistry (journal) , electrolyte , chloride , calibration curve , high performance liquid chromatography , biochemistry , organic chemistry , electrode
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 ( r 2 >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.