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Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules

Host–guest inclusion complexes of β-cyclodextrin with two vitamins viz., nicotinic acid and ascorbic acid in aqueous medium have been explored by reliable spectroscopic, physicochemical and calorimetric methods as stabilizer, carrier and regulatory releaser of the guest molecules. Job’s plots have b...

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Autores principales: Saha, Subhadeep, Roy, Aditi, Roy, Kanak, Roy, Mahendra Nath
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5071908/
https://www.ncbi.nlm.nih.gov/pubmed/27762346
http://dx.doi.org/10.1038/srep35764
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author Saha, Subhadeep
Roy, Aditi
Roy, Kanak
Roy, Mahendra Nath
author_facet Saha, Subhadeep
Roy, Aditi
Roy, Kanak
Roy, Mahendra Nath
author_sort Saha, Subhadeep
collection PubMed
description Host–guest inclusion complexes of β-cyclodextrin with two vitamins viz., nicotinic acid and ascorbic acid in aqueous medium have been explored by reliable spectroscopic, physicochemical and calorimetric methods as stabilizer, carrier and regulatory releaser of the guest molecules. Job’s plots have been drawn by UV-visible spectroscopy to confirm the 1:1 stoichiometry of the host-guest assembly. Stereo-chemical nature of the inclusion complexes has been explained by 2D NMR spectroscopy. Surface tension and conductivity studies further support the inclusion process. Association constants for the vitamin-β-CD inclusion complexes have been calculated by UV-visible spectroscopy using both Benesi–Hildebrand method and non-linear programme, while the thermodynamic parameters have been estimated with the help of van’t Hoff equation. Isothermal titration calorimetric studies have been performed to determine the stoichiometry, association constant and thermodynamic parameters with high accuracy. The outcomes reveal that there is a drop in ΔS(o), which is overcome by higher negative value of ΔH(o), making the overall inclusion process thermodynamically favorable. The association constant is found to be higher for ascorbic acid than that for nicotinic acid, which has been explained on the basis of their molecular structures.
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spelling pubmed-50719082016-10-26 Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules Saha, Subhadeep Roy, Aditi Roy, Kanak Roy, Mahendra Nath Sci Rep Article Host–guest inclusion complexes of β-cyclodextrin with two vitamins viz., nicotinic acid and ascorbic acid in aqueous medium have been explored by reliable spectroscopic, physicochemical and calorimetric methods as stabilizer, carrier and regulatory releaser of the guest molecules. Job’s plots have been drawn by UV-visible spectroscopy to confirm the 1:1 stoichiometry of the host-guest assembly. Stereo-chemical nature of the inclusion complexes has been explained by 2D NMR spectroscopy. Surface tension and conductivity studies further support the inclusion process. Association constants for the vitamin-β-CD inclusion complexes have been calculated by UV-visible spectroscopy using both Benesi–Hildebrand method and non-linear programme, while the thermodynamic parameters have been estimated with the help of van’t Hoff equation. Isothermal titration calorimetric studies have been performed to determine the stoichiometry, association constant and thermodynamic parameters with high accuracy. The outcomes reveal that there is a drop in ΔS(o), which is overcome by higher negative value of ΔH(o), making the overall inclusion process thermodynamically favorable. The association constant is found to be higher for ascorbic acid than that for nicotinic acid, which has been explained on the basis of their molecular structures. Nature Publishing Group 2016-10-20 /pmc/articles/PMC5071908/ /pubmed/27762346 http://dx.doi.org/10.1038/srep35764 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Saha, Subhadeep
Roy, Aditi
Roy, Kanak
Roy, Mahendra Nath
Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules
title Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules
title_full Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules
title_fullStr Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules
title_full_unstemmed Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules
title_short Study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules
title_sort study to explore the mechanism to form inclusion complexes of β-cyclodextrin with vitamin molecules
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5071908/
https://www.ncbi.nlm.nih.gov/pubmed/27762346
http://dx.doi.org/10.1038/srep35764
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