کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7612772 1493568 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantitative structure-retention relationship modeling of gas chromatographic retention times based on thermodynamic data
ترجمه فارسی عنوان
مدلسازی رابطهی ساختاری-ساختاری با مقدار کمی زمان نگهداری کروماتوگرافی گاز براساس داده های ترمودینامیکی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Thermodynamic parameters of ΔH(T0), ΔS(T0), and ΔCP for 156 compounds comprising alkanes, alkyl halides and alcohols were determined for a 5% phenyl 95% methyl stationary phase. The determination of thermodynamic parameters relies on a Nelder-Mead simplex optimization to rapidly obtain the parameters. Two methodologies of external and leave one out cross validations were applied to assess the robustness of the estimations of thermodynamic parameters. The largest absolute errors in predicted retention time across all temperature ramps and all compounds were 1.5 and 0.3 s for external and internal sets, respectively. The possibility of an in silico extension of the thermodynamic library was tested using a quantitative structure-retention relationship (QSRR) methodology. The estimated thermodynamic parameters were utilized to develop QSRR models. Individual partial least squares (PLS) models were developed for each of the three classes of the molecules. R2 values for the test sets of all models across all temperature ramps were larger than 0.99 and the average of relative errors in retention time predictions of the test sets for alkanes, alcohols, and alkyl halides were 1.8%, 2.4%, and 2.5%, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1358, 5 September 2014, Pages 225-231
نویسندگان
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