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Systematic investigations of peak distortions due to additives in supercritical fluid chromatography.
Journal of Chromatography A ( IF 4.1 ) Pub Date : 2020-03-16 , DOI: 10.1016/j.chroma.2020.461048
Emelie Glenne 1 , Jörgen Samuelsson 1 , Hanna Leek 2 , Patrik Forssén 1 , Magnus Klarqvist 3 , Torgny Fornstedt 1
Affiliation  

The impact of eluent components added to improve separation performance in supercritical fluid chromatography was systematically, and fundamentally, investigated. The model system comprised basic pharmaceuticals as solutes and eluents containing an amine (i.e., triethylamine, diethylamine, or isopropylamine) as additive with MeOH as the co-solvent. First, an analytical-scale study was performed, systematically investigating the impact of the additives/co-solvent on solute peak shapes and retentions, using a design of experiments approach; here, the total additive concentration in the eluent ranged between 0.021 and 0.105 % (v/v) and the MeOH fraction in the eluent between 16 and 26 % (v/v). The co-solvent fraction was found to be the most efficient tool for adjusting retentions, whereas the additive fraction was the prime tool for improving column efficiency and peak analytical performance. Next, the impacts of the amine additives on the shapes of the so-called overloaded solute elution profiles were investigated. Two principal types of preparative peak deformations appeared and were investigated in depth, analyzed using computer simulation with mechanistic modeling. The first type of deformation was due to the solute eluting too close to the additive perturbation peak, resulting in severe peak deformation caused by co-elution. The second type of deformation was also due to additive-solute interactions, but here the amine additives acted as kosmotropic agents, promoting the multilayer adsorption to the stationary phase of solutes with bulkier aryl groups.

中文翻译:

系统研究超临界流体色谱中添加剂引起的峰变形。

系统地,从根本上研究了洗脱液成分对提高超临界流体色谱分离性能的影响。该模型系统包含基本药物(作为溶质)和洗脱剂,其中包含胺(即三乙胺,二乙胺或异丙胺)作为添加剂,并以MeOH作为助溶剂。首先,进行了分析规模的研究,使用设计的实验方法,系统地研究了添加剂/助溶剂对溶质峰形状和保留度的影响;在此,洗脱液中的总添加剂浓度在0.021至0.105%(v / v)之间,洗脱液中的MeOH分数在16至26%(v / v)之间。发现助溶剂馏分是调节保留率的最有效工具,而添加剂级分是提高色谱柱效率和峰分析性能的主要工具。接下来,研究了胺添加剂对所谓的超载溶质洗脱曲线形状的影响。出现了两种主要类型的制备峰变形,并对其进行了深入研究,并使用带有机理模型的计算机模拟进行了分析。第一种变形是由于溶质洗脱太接近加和扰动峰,导致了共洗脱导致严重的峰变形。第二种形变也归因于添加剂-溶质之间的相互作用,但此处的胺类添加剂起到了促渗剂的作用,促进了多层吸附到具有更大芳基的溶质的固定相。研究了胺类添加剂对所谓的超载溶质洗脱曲线形状的影响。出现了两种主要类型的制备峰变形,并对其进行了深入研究,并使用带有机理模型的计算机模拟进行了分析。第一种变形是由于溶质洗脱太接近加和扰动峰,导致共洗脱导致严重的峰变形。第二种形变也归因于添加剂-溶质之间的相互作用,但此处的胺类添加剂起到了促渗剂的作用,促进了多层吸附到具有更大芳基的溶质的固定相。研究了胺类添加剂对所谓的超载溶质洗脱曲线形状的影响。出现了两种主要类型的制备峰变形,并对其进行了深入研究,并使用带有机理模型的计算机模拟进行了分析。第一种变形是由于溶质洗脱太接近加和扰动峰,导致共洗脱导致严重的峰变形。第二种形变也归因于添加剂-溶质之间的相互作用,但此处的胺类添加剂起了促渗剂的作用,促进了多层吸附到具有更大芳基的溶质的固定相上。出现了两种主要类型的制备峰变形,并对其进行了深入研究,并使用带有机理模型的计算机模拟进行了分析。第一种变形是由于溶质洗脱太接近加和扰动峰,导致共洗脱导致严重的峰变形。第二种形变也归因于添加剂-溶质之间的相互作用,但此处的胺类添加剂起到了促渗剂的作用,促进了多层吸附到具有更大芳基的溶质的固定相。出现了两种主要类型的制备峰变形,并对其进行了深入研究,并使用带有机理模型的计算机模拟进行了分析。第一种变形是由于溶质洗脱太接近加和扰动峰,导致共洗脱导致严重的峰变形。第二种形变也归因于添加剂-溶质之间的相互作用,但此处的胺类添加剂起到了促渗剂的作用,促进了多层吸附到具有更大芳基的溶质的固定相。
更新日期:2020-03-16
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