A convenient hydride derivatization procedure of methyl\|and ethylmercury chlorides to volatile hydrides was reported. In sealed vials methylmercury and ethylmercury compounds in acidic aqueous solutions were convert...A convenient hydride derivatization procedure of methyl\|and ethylmercury chlorides to volatile hydrides was reported. In sealed vials methylmercury and ethylmercury compounds in acidic aqueous solutions were converted into their volatile forms by the reaction with potassium tetrahydroborate(KBH 4) and elvolved to the headspace of the vials. The gaseous analytes in the headspace were extracted and concentrated by solid phase microextraction(SPME) and injected into gas chromatography (GC) for separation and identified by mass selective detector(MS).展开更多
An improved carbohydrate derivatization method employing 1-phenyl-3-methyl-5-pyrazolone(PMP) was developed in this study.Liquid ammonia was used instead of sodium hydroxide aqueous solution to provide the base medium ...An improved carbohydrate derivatization method employing 1-phenyl-3-methyl-5-pyrazolone(PMP) was developed in this study.Liquid ammonia was used instead of sodium hydroxide aqueous solution to provide the base medium for the derivatization reaction.Derivatization reaction and HPLC separation conditions were optimized,including reaction time,reaction temperature and PMP consumption.The derivatives of five reducing monosaccharides were well separated by HPLC. Because we employed ammonia instead of sodium hydro-xide,the excessive volatile ammonia can be removed by vacumm drying,these derivatives could be directly analyzed by MALDI-TOF-MS without desalting procedure,possessing potential application for monosaccharide and oligosaccharide separation and subsequent MS analysis.This method not only increased the MS detection sensitivity,but also decreased sample wastes during purification. We successfully applied this method to mo-nosaccharide composition analysis of polysaccharides SPPA-1,SPPB-1 and SPPC-1 purified from Spirulina(Platensis).展开更多
文摘A convenient hydride derivatization procedure of methyl\|and ethylmercury chlorides to volatile hydrides was reported. In sealed vials methylmercury and ethylmercury compounds in acidic aqueous solutions were converted into their volatile forms by the reaction with potassium tetrahydroborate(KBH 4) and elvolved to the headspace of the vials. The gaseous analytes in the headspace were extracted and concentrated by solid phase microextraction(SPME) and injected into gas chromatography (GC) for separation and identified by mass selective detector(MS).
文摘An improved carbohydrate derivatization method employing 1-phenyl-3-methyl-5-pyrazolone(PMP) was developed in this study.Liquid ammonia was used instead of sodium hydroxide aqueous solution to provide the base medium for the derivatization reaction.Derivatization reaction and HPLC separation conditions were optimized,including reaction time,reaction temperature and PMP consumption.The derivatives of five reducing monosaccharides were well separated by HPLC. Because we employed ammonia instead of sodium hydro-xide,the excessive volatile ammonia can be removed by vacumm drying,these derivatives could be directly analyzed by MALDI-TOF-MS without desalting procedure,possessing potential application for monosaccharide and oligosaccharide separation and subsequent MS analysis.This method not only increased the MS detection sensitivity,but also decreased sample wastes during purification. We successfully applied this method to mo-nosaccharide composition analysis of polysaccharides SPPA-1,SPPB-1 and SPPC-1 purified from Spirulina(Platensis).
