title: Determination of methyl and ethyl esters of methanesulfonic, benzenesulfonic and p-toluenesulfonic acids in active pharmaceutical ingredients by solid-phase microextraction (SPME) coupled to GC/SIM-MS.
abstract: The development, optimization and validation of an extraction method for methyl and ethyl esters of various sulfonic acids is presented. The extraction and determination of these esters in active pharmaceutical ingredients (APIs) was accomplished using solid-phase microextraction coupled to GC/MS in the SIM mode. The factors affecting the extraction efficiency are discussed. This method was validated as a limits test and allows the determination of the sulfonic esters at the 5 ppm level in APIs. The method proved to be reproducible (%R.S.D.s less than 6%) and suitable for use with external standard quantitation, and also met basic validation requirements. This method offers numerous advantages over liquid-liquid extraction methods and was also compared to other extraction techniques such as solid-phase extraction (SPE) and liquid-phase microextraction (LPME) also being developed in our laboratories.
authors.affiliation: Pfizer Global R and D, Analytical R and D, Eastern Point Road, Mail Stop 4077, Groton, CT 06340, USA. ivelisse.colon-rivera@pfizer.com
authors.forename: Ivelisse
authors.initials: I
authors.lastname: Colón
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Richoll
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry*; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D002845:Chromatography; D002849:Chromatography, Gas / Q000379:methods*; D004345:Drug Industry / Q000379:methods*; D004952:Esters / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006863:Hydrogen-Ion Concentration; D008698:Mesylates / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013997:Time Factors
chemical_list: D001557:Benzenesulfonates; D004952:Esters; D008698:Mesylates; D010710:Phosphates; C045880:methanesulfonic acid; C032365:benzenesulfonic acid; C029501:4-toluenesulfonic acid