کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9749002 | 1493798 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermodynamic studies of complexation and enantiorecognition processes of monoterpenoids by α- and β-cyclodextrin in gas chromatography
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Gas-liquid chromatography was applied in thermodynamic investigations of processes of complexation and enantioseparation by α- and β-cyclodextrins of chiral monoterpenoids. The distribution constants, stability constants and thermodynamic parameters enthalpy, entropy and free energy of the complexation processes were determined. It has been found that enantioseparation of monoterpenes by α- and β-cyclodextrins is the result of formation of 1:2 stoichiometric complexes. When 1:1 stoichiometric complexes are formed, enantioselectivity is not observed. All investigated processes of complexation are enthalpy-driven regardless of the stoichiometry of the formed complexes. âÎH, âTÎS and âÎG of complexation process have higher values for bicyclic than for monocyclic monoterpenoids as well as for α-CD than for β-CD. The first or second step of complexation may be responsible for enantioselectivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1078, Issues 1â2, 17 June 2005, Pages 136-143
Journal: Journal of Chromatography A - Volume 1078, Issues 1â2, 17 June 2005, Pages 136-143
نویسندگان
MaÅgorzata Skórka, Monika Asztemborska, Janusz Å»ukowski,