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Tomoki Yoshida
Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502
Agriculture, Biological Sciences & Forestry

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Water Vapor Sorption Behavior of Arabinoxylan from Corn Pericarp Tomoki Yoshida; Wahyu Dwianto; Yoichi Honda; Hiroshi Uyama; Jun-ichi Azuma
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.46-51

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.
Removal of Arabinose Substituents from Corn Pericarp Arabinoxylan Tomoki Yoshida; Wahyu Dwianto; Yoichi Honda; Hiroshi Uyama; Jun-ichi Azuma
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.41-45

Abstract

Partial acid hydrolysis of corn pericarp arabinoxylan (arabinose/xylose (A/X) ratio 0.35 and mean molecular weight of  53.6 × 103) was carried out at pH 1.0 for 1 ~ 6 h at 37 ~ 57 °C to remove arabinose substituents. The removal of arabinose could be described by regression analysis with the method of least squares. Following the regression profile, three kinds of desubstituted arabinoxylans having A/X ratios of 0.25, 0.12 and 0.03 with mean molecular weight values of 37.3 × 103, 15.6 × 103 and 7.2 × 103, respectively, could be prepared.  All corn pericarp arabinoxylans were in the amorphous state and the film formability of the native state was lost after the partial acid hydrolysis. 
Water Vapor Sorption Behavior of Arabinoxylan from Corn Pericarp Tomoki Yoshida; Wahyu Dwianto; Yoichi Honda; Hiroshi Uyama; Jun-ichi Azuma
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.46-51

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.
Removal of Arabinose Substituents from Corn Pericarp Arabinoxylan Tomoki Yoshida; Wahyu Dwianto; Yoichi Honda; Hiroshi Uyama; Jun-ichi Azuma
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.41-45

Abstract

Partial acid hydrolysis of corn pericarp arabinoxylan (arabinose/xylose (A/X) ratio 0.35 and mean molecular weight of  53.6 × 103) was carried out at pH 1.0 for 1 ~ 6 h at 37 ~ 57 °C to remove arabinose substituents. The removal of arabinose could be described by regression analysis with the method of least squares. Following the regression profile, three kinds of desubstituted arabinoxylans having A/X ratios of 0.25, 0.12 and 0.03 with mean molecular weight values of 37.3 × 103, 15.6 × 103 and 7.2 × 103, respectively, could be prepared.  All corn pericarp arabinoxylans were in the amorphous state and the film formability of the native state was lost after the partial acid hydrolysis. 
Co-Authors Hiroshi Uyama Jun-ichi Azuma Wahyu Dwianto Yoichi Honda