U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Main content area

Rheology and microstructure of gels based on wheat arabinoxylans enzymatically modified in arabinose to xylose ratio

Jorge A Marquez‐Escalante, Elizabeth Carvajal‐Millan, Madhav P Yadav, Madhuvanti Kale, Agustín Rascon‐Chu, Alfonso A Gardea, Elisa M Valenzuela‐Soto, Yolanda L Lopez‐Franco, Jaime Lizardi‐Mendoza, Craig B Faulds
Journal of the science of food and agriculture 2018 v.98 no.3 pp. 914-922
arabinose, arabinoxylan, atomic force microscopy, combs (social insects), crosslinking, ferulic acid, gels, microstructure, rheology, scanning electron microscopy, wheat, xylose
BACKGROUND: Arabinoxylans (AX) are polysaccharides consisting of a backbone of xyloses with arabinose substituents ester‐linked to ferulic acid (FA). The arabinose to xylose ratio (A/X) in AX may vary from 0.3 to 1.1. AX form covalent gels by cross‐linking of FA but physical interactions between AX chains also contribute to the network formation. The present study aimed to investigate the rheological and microstructural characteristics of gels based on AX enzymatically modified in A/X. RESULTS: Tailored AX presented A/X ranging from 0.68 to 0.51 and formed covalent gels. Dimers of FA content and elasticity (G′) increased from 0.31 to 0.39 g kg–¹ AX and from 106 to 164 Pa when the A/X in the polysaccharide decreased from 0.68 to 0.51. Atomic force microscopy images of AX gels showed a sponge‐like microstructure at A/X = 0.68, whereas, at lower values, gels presented a more compact microstructure. Scanning electron microscopy analysis of AX gels show an arrangement of different morphology, passing from an imperfect honeycomb (A/X = 0.68) to a flake‐like microstructure (A/X = 0.51). CONCLUSION: Lower A/X values favor the aggregation of AX chains resulting in an increase in di‐FA content, which improves the rheological and microstructural characteristics of the gel formed. © 2017 Society of Chemical Industry