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Water mobility within arabinoxylan and β‐glucan films studied by NMR and dynamic vapour sorption
Author(s) -
Ying Ruifeng,
Barron Cécile,
Saulnier Luc,
RondeauMouro Corinne
Publication year - 2011
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.4498
Subject(s) - arabinoxylan , sorption , glucan , chemistry , chemical engineering , polysaccharide , organic chemistry , adsorption , engineering
BACKGROUND: The main purpose of this research was to determine the impact of the structure and organisation of polysaccharides on the hydration properties of the cell walls of cereal grains. In order to remodel the lamellar assembly of arabinoxylan (AX) and (1 → 3)(1 → 4)‐β‐ D ‐glucan (BG) within the endosperm cell walls, films were prepared and analysed using dynamic vapour sorption and time domain nuclear magnetic resonance spectroscopy. RESULTS: The water diffusivities within the AX and BG films were measured at 20 °C by observing the water sorption kinetics within a mathematical model based on Fick's second law. The evolution of spin–spin relaxation times of water protons measured by increasing the temperature is explained by the additional contributions of motion of the protons of polysaccharides and/or rapid chemical exchanges of protons between water and hydroxyl groups of polysaccharides. CONCLUSION: The difference between patterns of water behaviour within the AX and BG films can be related to the difference in their nanostructures. The smaller nanopores of the BG films cause their nanostructure to be more compact. Copyright © 2011 Society of Chemical Industry