Influence of dehulling pretreatment on physicochemical properties of Gleditsia sinensis Lam. gum

Research output: Contribution to journalArticle

Abstract

The seeds of Gleditsia sinensis Lam., widespread in China, are an important source of galactomannans. G. sinensis gum was extracted from whole seeds using baking, boiling water and acid dehulling pretreatment, respectively. The physicochemical properties of the three isolated G. sinensis gums were studied to evaluate three pretreatment methods. The results illustrated that the properties of G. sinensis gum were significantly influenced by dulling method (p < 0.05) including the yield, M/G ratio, viscosity, chemical composition and molecular weight. Power-law model (sigma = k.gamma(n)) was applied to the rheological measurements, which indicated that solutions of Gb, Gw and Ga gum behaved as pseudoplastic fluids at the concentration of 0.5% (w/v). The gum obtained by acid pretreatment (Ga) had the lowest yield of 20-24% (w/w). However Ga showed a pronounced shear-thinning behavior and particularly higher viscosity compared with the gums extracted by baking pretreatment (Gb) and boiling water dehulling method (Gw). The mannose to galactose ratios (M/G ratio) for Gb, Gw and Ga were found to be 4.5, 4.4 and 6.9, respectively. The highest molecular weight of 3.31 x 10(6) Da was observed for the galactomannans of Gb. (C) 2010 Elsevier Ltd. All rights reserved.

Details

Authors
  • Hong-lei Jian
  • Cristhian Carrasco
  • Wei-ming Zhang
  • Jian-xin Jiang
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Food Science

Keywords

  • Gleditsia sinensis Lam. gum, Galactomannan, Dehulling pretreatment, Sugar composition, Rheological property
Original languageEnglish
Pages (from-to)1337-1343
JournalFood Hydrocolloids
Volume25
Issue number5
Publication statusPublished - 2011
Publication categoryResearch
Peer-reviewedYes