Abstract
The influence of the degree of arabinose substitution in arabinoxylan on its water vapor sorption behavior was investigated by comparing the application of the independent dual sorption model and the Hailwood-Horrobin (H-H) model on corn pericarp arabinoxylans with arabinose/xylose ratios of 0.35, 0.26 and 0.12. Characterization of their sigmoid shaped adsorption isotherms grouped in IUPAC Type II indicates the usefulness of the former model to demonstrate the importance of arabinose substituents in increasing the affinity of corn pericarp arabinoxylan for water molecules. The present results open the future applicability of the independent dual sorption model for characterization of the hydration behavior of other branched polymers.
Highlights
Corn is an important cereal grain because of its numerous food applications and is cultivated throughout the world
All corn pericarp arabinoxylans with different arabinose contents showed sigmoidal shaped adsorption isotherms grouped in IUPAC Type II similar to those of hemicelluloses isolated from softwood and hardwood (Sadoh 1961, 1962)
The present study showed the influence of the degree of arabinose substitution in arabinoxylan from corn pericarp on its water vapor sorption behavior
Summary
Corn is an important cereal grain because of its numerous food applications and is cultivated throughout the world. Quality control of the corn grain during cultivation and harvest is highly important for the industry. One of the factors which determines the quality and preservability of foods including corn flour and bran is moisture content regulated mainly by their water vapor sorption properties (Kumar 1974; Dural and Hines 1993; Al-Muhtaseb et al 2002). Since corn pericarp is the outermost layer which protects the seed from the external enviornment, the water vapor sorption characteristics of this layer is of principal importance. Corn pericarp is mainly composed of carbohydrates rich in hemicellulose with arabinoxylan predominating (Yoshida et al 2010, 2012). We described the preparation of partially desubstituted arabinoxylans with arabinose/xylose ratios of 0.25, 0.12 and 0.03, by weak acid hydrolysis
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