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Dynamic rheological and structural characterization of fish gelatin - Gum arabic coacervate gels cross-linked by tannic acid

Cited 106 time in Web of Science Cited 123 time in Scopus
Authors

Anvari, Mohammad; Chung, Donghwa

Issue Date
2016-10
Publisher
Elsevier BV
Citation
Food Hydrocolloids, Vol.60, pp.516-524
Abstract
The propose of this study was to investigate the rheological and structural properties of fish gelatin (FG)-gum arabic (GA) complex coacervate gels treated with oxidized or non-oxidized tannic acid (OX-TA or NO-TA, respectively) at different concentrations ranged from 0.0 to 0.3% (v/v), using compositional, dynamic oscillatory rheological, and Fourier transform infrared (FTIR) analyses. The results revealed that the degree of NO-TA incorporation for cross-linking with FG via hydrogen bindings into the system was more pronounced than affinity of OX-TA for reaction through covalent bindings as evidenced by greater loss in volume fraction, moisture content, and biopolymer content values into the FG-GA coacervate phase. FTIR analysis showed addition of NO-TA led to more molecular disorder into the system, so that higher concentrations (0.2 and 0.3%) of the cross-linker disrupted electrostatic interactions through formation of stronger hydrogen bindings with proteins. Rheological results mentioned that addition and enhancement of (NO- or OX-) TA concentration improved gelling ability and mechanical properties of the FG-GA coacervate gels. However, frequency sweep test results implied that all the gels obtained can be classified as weak gels with shear-thinning behavior. Based on weak gel model, the gels obtained by treated FG-GA coacervates with NO-TA had more developed network structures and stronger intermolecular connectivities than those of obtained by the coacervates modified by OX-TA. The results of the current study provide basic knowledge necessary for the use of reinforced FG-GA complex coacervate gels in many useful applications, such as microencapsulation and hydrogel formation, in food and pharmaceutical industries. (C) 2016 Elsevier Ltd. All rights reserved.
ISSN
0268-005X
Language
English
URI
https://hdl.handle.net/10371/117444
DOI
https://doi.org/10.1016/j.foodhyd.2016.04.028
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Graduate School of International Agricultural Technology (국제농업기술대학원)Dept. of International Agricultural Technology (국제농업기술학과)Journal Papers (저널논문_국제농업기술학과)
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