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An enantioselective depletion study of praziquantel (PZQ) in perch muscle was done using a simple, sensitive and specific liquid chromatography–tandem mass spectrometry (LC–MS/MS) method. Two cyclic polypeptides and two cyclic saccharide chromatographic columns were evaluated. The new hydroxypropyl β-cyclodextrin (HP-RSP) superficially porous particle (SPP) column produced the optimum separation and...
A sensitive and selective HPLC–MS/MS method was developed for the quantitative analysis of dicamba residues in raw agricultural commodities (RACs). Instead of analysis in the traditionally used negative electrospray ionization (ESI) mode, these anionic compounds were detected in positive ESI with the use of ion-pairing reagents. In this approach, only a small amount (60µM) of a commercially available...
A new paired ion electrospray ionization tandem mass spectrometry method for determination of anionic surfactants in water samples was developed. In this method, dicationic ion-pairing reagents were complexed with monoanionic analytes to facilitate analyte detection in positive mode electrospray ionization – mass spectrometry. Single ion monitoring and selected reaction monitoring on a triple quadrupole...
A series of six oligosaccharides: linear arabinosides, cellosides, isomaltosides, mannosides, maltosides and xylosides containing up to 15 sugar units, as well as α, β and γ-cyclodextrins, were separated without derivatization with acetonitrile-water mobile phases and a β-cyclodextrin bonded phase column using both UV (195 nm) and refractive index detection. The mobile phases contained more than 60%v/v...
In this work, synthetic and natural chiral selectors were combined to form two different chiral stationary phases (CSPs). These were made by bonding R- or S-(1-naphthylethyl) carbamate (R-NEC or S-NEC)-derivatized vancomycin molecules to a silica gel support. The two CSPs were evaluated using a set of 60 enantiomeric pairs. The results were compared to the ones obtained with the commercial underivatized...
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