کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1185559 1492121 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Copigmentation of malvidin-3-O-glucoside with five hydroxybenzoic acids in red wine model solutions: Experimental and theoretical investigations
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Copigmentation of malvidin-3-O-glucoside with five hydroxybenzoic acids in red wine model solutions: Experimental and theoretical investigations
چکیده انگلیسی


• Copigmentation was determined by spectroscopy in wine model solutions.
• Five hydroxybenzoic acids were analyzed as cofactors combined with malvidin-3-O-glucoside.
• Absorption differences related to the copigment complexes were explained by ΔG°, ΔH°, and ΔS°.
• Theoretical studies of the copigmentations were conducted with molecular dynamic methods.

In the present research, the copigmentations of malvidin-3-O-glucoside with five hydroxybenzoic cofactors (p-hydroxybenzoic acid, protocatechuic acid, gallic acid, vanillic acid, and syringic acid) were investigated. The influence of the concentration of these cofactors and the reaction temperature was examined. The equilibrium constant (K), stoichiometric ratio (n) and the thermodynamic parameters (ΔG°, ΔH°, ΔS°) related to the copigmentation were also reported here. Theoretical calculations were performed to identify the relative arrangement between the pigment and cofactors in the copigmentation complexes. Besides, the comparison of the relative binding free energies (ΔΔGbinding) derived from the theoretical calculations and experimental data were made, and the binding strength of these copigmentation complexes was discussed with the interaction energies (ΔE). AIM analysis was also used to explore the main driving forces contributing to the copigmentation. In the comparison of the five studied cofactors, syringic acid had a stronger copigmentation effect than the other four phenolic acids investigated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 170, 1 March 2015, Pages 226–233
نویسندگان
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