Evaluation of octadecyl-bonded silica membrane disk for extraction of surfactants from water

Octadecyl-bonded silica membrane disk was evaluated for extraction of surfactants from water. Different parameters such as extraction efficiency, maximum capacity of the disk, proper eluent for washing the surfactants from the disk and effect of vacuum pressure on percent recoveries were studied. Results showed that more than 95 percent of surfactants were extracted easily from water, Maximum capacity of the disk was about 5 mg. Also it was determined that this technique compare to liquid/liquid extraction would introduce less error in analytical results

Qualitative and Quantitative Analyses of the Enantiomers of Nicotine and Related Alkaloids Employing Chiral Supercritical Fluid Chromatography in Commercial Nicotine Samples and in E-Cigarette Products

Several commercial sources of tobacco-derived nicotine (TDN) and synthetic nicotine (SyN) and a variety of e-cigarette liquids employing either TDN or SyN have been evaluated to determine the enantiomer distributions of R- and S-nicotine and R- and S-nornicotine by chiral supercritical fluid chromatography (chiral-SFC) with UV diode array detection (DAD-UV). The data generated are used to test the mismatched vs. matched hypothesis of Cheetham et al. as a means to distinguish products containing TDN from products with SyN