NDLI: Colloidal complexation of a macromolecule with a small molecular weight natural polyphenol: implications in modulating polymer functionalities

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Colloidal complexation of a macromolecule with a small molecular weight natural polyphenol: implications in modulating polymer functionalities

Content Provider	Royal Society of Chemistry (RSC)
Author	Blijdenstein, Theo B. J. ten-Hoorn, Jack Seijen Hazekamp, Johan Velikov, Krassimir P. Patel, Ashok R.
Copyright Year	2013
Abstract	Natural polyphenolic compounds show interesting complexation behavior with various macromolecules due to their unique structural characteristics that enables molecular transition such as electronic delocalization and conjugation and intra- and intermolecular hydrogen bonding. Here, we report on the preparation and characterization of novel colloidal complexes (size range of 56–116 nm) based on the spontaneous interactions of a small molecular weight polyphenol (tannic acid) with an industrially relevant macromolecule (methylcellulose). The binding stoichiometry obtained from isothermal titration calorimetry suggested that 33 molecules of tannic acid were bound to one molecule of polymer. The values of ΔH (−11.4 kJ mol−1) and ΔS (−35.5 J K−1 mol−1) suggested that the interaction was enthalpy driven and the relatively low value of ΔH further indicated the non-covalent nature (i.e. hydrophobic interaction and hydrogen bonding) of the interaction. Effects of this complexation on the functionalities of methylcellulose were investigated in terms of the loss of thermoreversible gelling (due to the irreversible association of colloidal complexes at high temperature), improvement of the emulsifying property (because of the interfacial localization of hydrophobic colloidal complexes further contributing to the gelling of the interfacial film) and enhancement of the foam stabilizing property (based on the absorption of colloidal complexes on the air–water interface and resulting enhancement of the interfacial stiffness due to surface gelation invoked by the colloidal complexes). These findings will be of wide interest to researchers and industrial scientists working in the field of polymer chemistry and material science, especially because methylcellulose is one of the most commonly used polymers for a range of industrial applications.
Starting Page	1428
Ending Page	1436
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	5
Journal	Soft Matter
DOI	10.1039/c2sm27200h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Stoichiometry Polymer chemistry Polyphenol Macromolecule Enthalpy Polymer Isothermal titration calorimetry Hydrophobe Hydrogen bond Methyl cellulose
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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