Li J, Cai B
Analytical research and development, 3M pharmaceuticals, 3M center, St. Paul, MN 55144, USA.
J Chromatogr A. 2001 Jan 5;905(1-2):35-46. doi: 10.1016/s0378-4347(00)00527-2.
This paper describes the results of the evaluation of retention dependence on the physicochemical properties of solutes in linear gradient elution by reversed-phase liquid chromatography (RPLC) based on linear solvation energy relationships (LSERs). Retention time data on Inertsil ODS(3) column by linear gradient elution were collected for both acetonitrile-water and methanol-water binary mobile phases under various gradient steepness. Based on the LSERs, the retention times were linearly correlated with the physicochemical properties (size, dipolarity, and hydrogen bond donor-acceptor acidity and basicity) of solutes. As predicted by LSERs, very acceptable linear relationships are observed for both mobile phases. While the magnitudes of the coefficients are modified by the gradient steepness, their signs are consistent with those obtained by isocratic elution. As obtained for isocratic elution, the dominant factors to retention in linear gradient elution of RPLC are the solutes' size and hydrogen bond acceptor basicity. The conclusions of the study allow us to predict retention in chromatographic method development by gradient elution.
本文描述了基于线性溶剂化能关系（LSERs），通过反相液相色谱（RPLC）在线性梯度洗脱中溶质保留对其物理化学性质的依赖性评估结果。在不同梯度陡度下，针对乙腈 - 水和甲醇 - 水二元流动相，收集了Inertsil ODS(3)柱上线性梯度洗脱的保留时间数据。基于LSERs，保留时间与溶质的物理化学性质（大小、偶极矩以及氢键供体 - 受体酸度和碱度）呈线性相关。正如LSERs所预测的，两种流动相均观察到非常理想的线性关系。虽然系数大小会因梯度陡度而改变，但其符号与等度洗脱所得结果一致。与等度洗脱情况一样，RPLC线性梯度洗脱中保留的主要影响因素是溶质的大小和氢键受体碱度。该研究结论使我们能够在梯度洗脱色谱方法开发中预测保留情况。
