A structural study of the self-association of different starches in presence of bacterial cellulose fibrils

DOI: 10.1016/j.carbpol.2022.119361

Authors: P. Díaz-Calderón (Universidad de los Andes) , E. Simone (University of Leeds) , A. I. I. Tyler (University of Leeds) , J. Enrione (Universidad de los Andes) , T. Foster (Campden BRI; The University of Nottingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Carbohydrate Polymers , VOL 288

State: Published (Approved)
Published: July 2022
Diamond Proposal Number(s): 22659

Abstract: A multi-analytical study was performed to analyse the effect of bacterial cellulose (BCF) on the self-association of starches with different amylose content (wheat, waxy-maize), assessing macrostructural properties (rheology, gel strength) and some nano and sub-nano level features (small and wide-angle X-ray scattering). Although pasting viscosities and G′ were significantly increased by BCF in both starches, cellulose did not seem to promote the self-association of amylose in short-range retrogradation. A less elastic structure was reflected by a 2–3-fold increase in loss factor (G″/G′) at the highest BCF concentration tested. This behavior agreed with the nano and sub-nano characterisation of the samples, which showed loss of starch lamellarity and incomplete full recovery of an ordered structure after storage at 4 °C for 24 h. The gel strength data could be explained by the contribution of BCF to the mechanical response of the sample. The information gained in this work is relevant for tuning the structure of tailored starch-cellulose composites.

Journal Keywords: Starch; Bacterial cellulose; Retrogradation; Viscoelasticity; Nanostructure; Gel strength

Subject Areas: Biology and Bio-materials, Food Science


Instruments: I22-Small angle scattering & Diffraction

Added On: 30/03/2022 08:42

Discipline Tags:

Soft condensed matter physics Materials Science Polymer Science Life Sciences & Biotech Food Science

Technical Tags:

Scattering Small Angle X-ray Scattering (SAXS) Wide Angle X-ray Scattering (WAXS)