Changes in gelatinisation and pasting properties of various starches (wheat, maize and waxy maize) by the addition of bacterial cellulose fibrils

Díaz-Calderón, P. and Macnaughtan, William and Hill, Sandra and Foster, Tim and Enrione, Javier and Mitchell, John (2018) Changes in gelatinisation and pasting properties of various starches (wheat, maize and waxy maize) by the addition of bacterial cellulose fibrils. Food Hydrocolloids, 80 . pp. 274-280. ISSN 1873-7137

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Abstract

The aim of this work was to analyse the effect of bacterial cellulose fibrils (BCF) on the gelatinization profile and pasting properties of starches from different sources (wheat, maize and waxy maize) and amylose contents. Blends of 8% starch with different BCF levels (0, 0.5, 2, 6 and 10% based on the dry weight of starch) were prepared and tested by Rapid Visco-Analysis (RVA), Differential Scanning Calorimetry (DSC) and both Optical and Polarized Light Microscopy. Results showed that BCF produce a significant modification of pasting properties. The pasting temperature was reduced but viscosities (peak, final, trough, breakdown and final) increased. The reduction in pasting temperature at the highest BCF addition was 200C higher for maize and wheat starches but only 20C higher for waxy maize starch. In contrast to the pasting temperature, the gelatinisation temperature by DSC for all three starches slightly varied upon BCF addition, but the gelatinisation enthalpy was reduced to a greater extent than values reported for the addition of other hydrocolloids to starch blends. Optical and polarized light microscopy showed the presence of domains rich in starch and highly aggregated BCF in all three starches evaluated. The increase in viscosity and decrease in pasting temperature are discussed in terms of changes in starch concentrations in the starch rich domain. These results open interesting perspectives in the use of bacterial cellulose and plant cell walls to design novel bio-composites to structure foods.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/948185
Keywords: Bacterial cellulose; Starch; Gelatinisation; Pasting properties; Advanced materials
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences > Division of Food Sciences
Identification Number: https://doi.org/10.1016/j.foodhyd.2018.02.023
Depositing User: Foster, Timothy
Date Deposited: 04 Jun 2018 12:14
Last Modified: 04 May 2020 19:47
URI: http://eprints.nottingham.ac.uk/id/eprint/52210

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