The movement of a particular component along an HPLC column is studied on the ba-sis of equilibrium equations. Numerical simulation of multi--step gradient elution HPLC isperformed by means o? a personal computer prog...The movement of a particular component along an HPLC column is studied on the ba-sis of equilibrium equations. Numerical simulation of multi--step gradient elution HPLC isperformed by means o? a personal computer program. The location x, as a fraction of thecolumn length, for a given time t o? each compound is calculated, the velocity and corre-sponding acceleration are given as well. Diagrams for x,dx/dt and d^2x/dt^2 versus t display themovement process of the different components along the HPLC column during gradient elu-tion. The prediction of the retention time and peak width, and the optimization for the multi-step gradient elution HPLC are all based on such simulation and the molecular structure ofthe. components is separated as well.展开更多
目的:建立HPLC-DAD法测定“武当三号金银花”藤中4种有效成分的含量。方法采用Fortis Xi Phenyl柱(250 mm×4.6 mm,5μm);流动相为乙腈(A)-0.5%冰醋酸溶液(B)进行线性梯度洗脱;马钱苷、绿原酸、芦丁、木犀草苷检测波长分别...目的:建立HPLC-DAD法测定“武当三号金银花”藤中4种有效成分的含量。方法采用Fortis Xi Phenyl柱(250 mm×4.6 mm,5μm);流动相为乙腈(A)-0.5%冰醋酸溶液(B)进行线性梯度洗脱;马钱苷、绿原酸、芦丁、木犀草苷检测波长分别为236、327、354、348 nm;柱温:30℃。结果马钱苷、绿原酸、芦丁、木犀草苷4个化合物在各自测定的范围内均呈良好的线性关系(r≥0.9994),平均回收率为98.9%-99.9%。结论该法操作简单,灵敏度高,重现性好,为较全面控制“武当三号金银花”藤的质量提供了一种可靠的方法。展开更多
目的:探讨以C_(18)快速色谱柱替代常规色谱柱实现HPLC快速梯度分析时,梯度洗脱程序的调整规律。方法:采用Allti- ma C_(18)高速色谱柱(33mm×7mm,3μm;53mm×7mm,3μm)、Alltima C_(18)常规色谱柱(250mm×4.6mm,5μm)及YMC ...目的:探讨以C_(18)快速色谱柱替代常规色谱柱实现HPLC快速梯度分析时,梯度洗脱程序的调整规律。方法:采用Allti- ma C_(18)高速色谱柱(33mm×7mm,3μm;53mm×7mm,3μm)、Alltima C_(18)常规色谱柱(250mm×4.6mm,5μm)及YMC C_(18)常规色谱柱(150mm×4.6mm,5μm);梯度洗脱;检测波长254nm;流速为0.8~2.5mL·min^(-1)。比较不同梯度洗脱程序下利奈唑胺及其14个有关物质的色谱行为。结果:色谱柱确定后,梯度变化率(ΔC_B/Δt_G)是决定色谱系统选择性的关键因素;在利用快速色谱柱替代普通色谱柱进行分离时,应根据具体分离情况调节流速,使色谱系统达到最佳;当HPLC梯度洗脱系统的流速改变后,应根据洗脱体积(FΔt_G)不变的原则重新确定梯度运行时间。结论:采用高速色谱柱时并相应地调整梯度程序,可顺利实现HPLC梯度洗脱快速分析。展开更多
文摘The movement of a particular component along an HPLC column is studied on the ba-sis of equilibrium equations. Numerical simulation of multi--step gradient elution HPLC isperformed by means o? a personal computer program. The location x, as a fraction of thecolumn length, for a given time t o? each compound is calculated, the velocity and corre-sponding acceleration are given as well. Diagrams for x,dx/dt and d^2x/dt^2 versus t display themovement process of the different components along the HPLC column during gradient elu-tion. The prediction of the retention time and peak width, and the optimization for the multi-step gradient elution HPLC are all based on such simulation and the molecular structure ofthe. components is separated as well.
文摘目的:探讨以C_(18)快速色谱柱替代常规色谱柱实现HPLC快速梯度分析时,梯度洗脱程序的调整规律。方法:采用Allti- ma C_(18)高速色谱柱(33mm×7mm,3μm;53mm×7mm,3μm)、Alltima C_(18)常规色谱柱(250mm×4.6mm,5μm)及YMC C_(18)常规色谱柱(150mm×4.6mm,5μm);梯度洗脱;检测波长254nm;流速为0.8~2.5mL·min^(-1)。比较不同梯度洗脱程序下利奈唑胺及其14个有关物质的色谱行为。结果:色谱柱确定后,梯度变化率(ΔC_B/Δt_G)是决定色谱系统选择性的关键因素;在利用快速色谱柱替代普通色谱柱进行分离时,应根据具体分离情况调节流速,使色谱系统达到最佳;当HPLC梯度洗脱系统的流速改变后,应根据洗脱体积(FΔt_G)不变的原则重新确定梯度运行时间。结论:采用高速色谱柱时并相应地调整梯度程序,可顺利实现HPLC梯度洗脱快速分析。