title: Analysis of isopropyl para-toluenesulphonate in palm-based esters by gas chromatography with flame ionization detection and confirmed with mass spectrometry.
abstract: A simple and rapid gas chromatography (GC) method with flame ionization detector was developed for detection of isopropyl para-toluenesulphonate (IPTS) in palm-based isopropyl palmitate (IPP) and isopropyl myristate (IPM). The method involved spiking the IPP/IPM samples with IPTS and directly injecting the spiked samples into GC without undergoing clean-up steps. The calibration curves for IPTS showed good linearity with coefficient correlation of 0.9999 for six-point calibration from 0.5 to 50 μg mL(-1)  and 0.9996 for six-point calibration from 0.5 to 200 μg mL(-1) . IPTS recoveries from IPP were 98.6-103.5% with relative standard deviation (RSD) of 0.40-2.80%, whereas recoveries from IPM were 97.0-107.2% with RSD of 0.42-4.21%. The identity of IPTS recovered from the isopropyl esters was confirmed by a GC-mass spectrometer detector. The method was successfully applied to the analyses of IPTS in commercial samples. It was found that there were IPTS in the range of 34.8-1303.0 μg g(-1)  in the palm-based esters for some of the samples analysed.
authors.affiliation: Advanced Oleochemical Technology Division, Malaysian Palm Oil Board, Lot 9 & 11, Jalan P10/14, Section 10, 43650, Bandar Baru Bangi, Selangor, Malaysia. bonnie@mpob.gov.my
authors.forename: B Y P
authors.initials: BY
authors.lastname: Tay
mesh_terms: D002138:Calibration; D002849:Chromatography, Gas / Q000379:methods*; D004952:Esters / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods*; D012015:Reference Standards; D015203:Reproducibility of Results; D013451:Sulfonic Acids / Q000032:analysis*
chemical_list: D004952:Esters; D013451:Sulfonic Acids