کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7613876 1493602 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molecular orientation of gel forming compounds and their effect on molecular-shape selectivity in liquid chromatography
ترجمه فارسی عنوان
جهت گیری مولکولی ترکیبات ژل و تاثیر آنها بر انتخاب مولکولی شکل در کروماتوگرافی مایع
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Double-alkylated glutamic acid and aminoadipic acid derived gel systems (G1 and G2) have been prepared and then grafted onto silica particles. Gel-forming compounds-grafted silica particles (Sil-G1 and Sil-G2) were then applied for the liquid chromatographic separation of shape-constrained isomers of polycyclic aromatic hydrocarbons (PAHs) and tocopherols as stationary phases. G1 and G2 were analyzed before and after immobilization onto silica. Elemental analysis and thermogravimentric analysis (TGA) results showed almost the same amounts of organic phases were grafted in Sil-G1 and Sil-G2 phases. However, chromatographic results showed large differences of molecular-shape selectivity between the stationary phases. Little change in the chemical structures of the gel-forming compounds can change the molecular orientation as well as drastic change in molecular recognition in liquid chromatography. Molecular orientation of the functional groups affected the interaction mechanism for the separation of shape-constrained isomers. Comparison of the shape selectivity of Sil-G1 and Sil-G2 phases with other commercial columns is also described.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1324, 10 January 2014, Pages 149-154
نویسندگان
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