A novel monolithic stationary phase with long alkyl chain ligands was introduced and evaluated in pressurized capillary electrochromatography(p-CEC) by using a mixture of neutral and charged compounds. The capillary m...A novel monolithic stationary phase with long alkyl chain ligands was introduced and evaluated in pressurized capillary electrochromatography(p-CEC) by using a mixture of neutral and charged compounds. The capillary monolithic-column was prepared by in situ copolymerization of ethylene dimethacrylate,alkyl alcohol and 2-acrylamido-2-methyl-1-propanesulfonic acid in a quadruple porogenic solvent consisting of 1,4-butanediol/cyclohexanol/docecanol/water. Effects of experimental parameters in p-CEC,such as pressure and electrical field strength,on the separation were investigated. The baseline separation of the components in the mixture was achieved. The monolithic column can be used as an alternative to the conventional capillary column such as the reversed phase ODS.展开更多
以1.5μm无孔硅胶颗粒(non-po rou s s ilica,NPS)为固定相,采用电压和压力联合驱动流动相,用反相梯度加压毛细管电色谱(p-CEC)在7.5m in内实现了核糖核酸酶A、细胞色素C、溶菌酶和肌红蛋白等4种蛋白质的快速、高效的分离。比较了梯度...以1.5μm无孔硅胶颗粒(non-po rou s s ilica,NPS)为固定相,采用电压和压力联合驱动流动相,用反相梯度加压毛细管电色谱(p-CEC)在7.5m in内实现了核糖核酸酶A、细胞色素C、溶菌酶和肌红蛋白等4种蛋白质的快速、高效的分离。比较了梯度加压毛细管电色谱和微柱液相色谱(μ-HPLC)分离蛋白质的结果,同时考察了固定相、离子对试剂三氟醋酸(TFA)浓度和电压等条件对梯度加压毛细管电色谱分离蛋白质的影响。结果表明,梯度p-CEC可以通过调节电压精细调节带电溶质的保留,提高分离选择性,缩短分离时间,得到较高的柱效。该方法在蛋白质分离分析及蛋白质组学的研究中具有很大的应用潜力,为高效快速地分离蛋白质开辟了新的途径。展开更多
研究建立利用加压毛细管电色谱(p CEC)测定乳及乳制品中三聚氰胺的分析方法。样品采用2%三氯乙酸水溶液超声提取,阳离子固相萃取柱(MCX)净化,提取液经C18反相毛细管电色谱柱分离,流动相乙腈-10 mmol/L辛烷磺酸钠溶液(p H 3.0)=15+85,泵...研究建立利用加压毛细管电色谱(p CEC)测定乳及乳制品中三聚氰胺的分析方法。样品采用2%三氯乙酸水溶液超声提取,阳离子固相萃取柱(MCX)净化,提取液经C18反相毛细管电色谱柱分离,流动相乙腈-10 mmol/L辛烷磺酸钠溶液(p H 3.0)=15+85,泵流速0.05 m L/min,分离电压-2 k V,紫外检测器240 nm检测。该方法在1.0 mg/kg^100 mg/kg质量浓度范围内线性关系良好(R2=0.999),在牛奶和酸奶中的定量限为2.5 mg/kg,在奶粉中的定量限为10 mg/kg,加标回收率为78.9%~93.5%,相对标准偏差小于5%。展开更多
文摘A novel monolithic stationary phase with long alkyl chain ligands was introduced and evaluated in pressurized capillary electrochromatography(p-CEC) by using a mixture of neutral and charged compounds. The capillary monolithic-column was prepared by in situ copolymerization of ethylene dimethacrylate,alkyl alcohol and 2-acrylamido-2-methyl-1-propanesulfonic acid in a quadruple porogenic solvent consisting of 1,4-butanediol/cyclohexanol/docecanol/water. Effects of experimental parameters in p-CEC,such as pressure and electrical field strength,on the separation were investigated. The baseline separation of the components in the mixture was achieved. The monolithic column can be used as an alternative to the conventional capillary column such as the reversed phase ODS.
文摘以1.5μm无孔硅胶颗粒(non-po rou s s ilica,NPS)为固定相,采用电压和压力联合驱动流动相,用反相梯度加压毛细管电色谱(p-CEC)在7.5m in内实现了核糖核酸酶A、细胞色素C、溶菌酶和肌红蛋白等4种蛋白质的快速、高效的分离。比较了梯度加压毛细管电色谱和微柱液相色谱(μ-HPLC)分离蛋白质的结果,同时考察了固定相、离子对试剂三氟醋酸(TFA)浓度和电压等条件对梯度加压毛细管电色谱分离蛋白质的影响。结果表明,梯度p-CEC可以通过调节电压精细调节带电溶质的保留,提高分离选择性,缩短分离时间,得到较高的柱效。该方法在蛋白质分离分析及蛋白质组学的研究中具有很大的应用潜力,为高效快速地分离蛋白质开辟了新的途径。
文摘研究建立利用加压毛细管电色谱(p CEC)测定乳及乳制品中三聚氰胺的分析方法。样品采用2%三氯乙酸水溶液超声提取,阳离子固相萃取柱(MCX)净化,提取液经C18反相毛细管电色谱柱分离,流动相乙腈-10 mmol/L辛烷磺酸钠溶液(p H 3.0)=15+85,泵流速0.05 m L/min,分离电压-2 k V,紫外检测器240 nm检测。该方法在1.0 mg/kg^100 mg/kg质量浓度范围内线性关系良好(R2=0.999),在牛奶和酸奶中的定量限为2.5 mg/kg,在奶粉中的定量限为10 mg/kg,加标回收率为78.9%~93.5%,相对标准偏差小于5%。
