应用凝胶色谱/超高效液相色谱-串联三重四极杆质谱建立了饲料中16种脂溶性染料测定的新方法。样品经20 m L乙酸乙酯-环己烷（1∶1）提取,凝胶色谱系统净化后,以0.1%甲酸溶液-甲醇为流动相进行梯度洗脱,各脂溶性染料经C18柱得到良好分离...应用凝胶色谱/超高效液相色谱-串联三重四极杆质谱建立了饲料中16种脂溶性染料测定的新方法。样品经20 m L乙酸乙酯-环己烷（1∶1）提取,凝胶色谱系统净化后,以0.1%甲酸溶液-甲醇为流动相进行梯度洗脱,各脂溶性染料经C18柱得到良好分离。16种染料在2-100μg/L范围内线性关系良好,相关系数（r2）不小于0.99。其检出限为25μg/kg,定量下限为50μg/kg。饲料样品在低、中、高3个加标浓度下,16种脂溶性染料的回收率为66.4%-108.5%,结果表明方法适用于饲料中16种脂溶性染料的检测。该方法操作简单、准确、杂质干扰少。展开更多
A class of core-shell-type fluorescent nanospheres with a particle diameter less than 40 nm,which emit orange,yellow,green and cyan light,respectively,were prepared.In fabricating strategy,the water-insoluble,photo-th...A class of core-shell-type fluorescent nanospheres with a particle diameter less than 40 nm,which emit orange,yellow,green and cyan light,respectively,were prepared.In fabricating strategy,the water-insoluble,photo-thermostable fluorescent dye molecules are molecularly dispersed and embedded in the nanoscale crosslinked polymeric matrix via a modified miniemulsion polymerization process,and then the biocompatible shells are achieved by a seeded polymerization technique.These obtained nanospheres are uniform in size,highly photostable,of high chemical resistance and high fluorescence quantum-yield.展开更多
文摘应用凝胶色谱/超高效液相色谱-串联三重四极杆质谱建立了饲料中16种脂溶性染料测定的新方法。样品经20 m L乙酸乙酯-环己烷（1∶1）提取,凝胶色谱系统净化后,以0.1%甲酸溶液-甲醇为流动相进行梯度洗脱,各脂溶性染料经C18柱得到良好分离。16种染料在2-100μg/L范围内线性关系良好,相关系数（r2）不小于0.99。其检出限为25μg/kg,定量下限为50μg/kg。饲料样品在低、中、高3个加标浓度下,16种脂溶性染料的回收率为66.4%-108.5%,结果表明方法适用于饲料中16种脂溶性染料的检测。该方法操作简单、准确、杂质干扰少。
文摘A class of core-shell-type fluorescent nanospheres with a particle diameter less than 40 nm,which emit orange,yellow,green and cyan light,respectively,were prepared.In fabricating strategy,the water-insoluble,photo-thermostable fluorescent dye molecules are molecularly dispersed and embedded in the nanoscale crosslinked polymeric matrix via a modified miniemulsion polymerization process,and then the biocompatible shells are achieved by a seeded polymerization technique.These obtained nanospheres are uniform in size,highly photostable,of high chemical resistance and high fluorescence quantum-yield.
