Gel formation and low-temperature intramolecular conformation transition of a triple-helical polysaccharide lentinan in water

Biopolymers
Yangyang ZhangLina Zhang

Abstract

The gelation behavior of the triple-helical polysaccharide lentinan fractions having different molecular weights in water at 25 degrees C were studied by using a rheometer. The analysis of concentration and molecular weight dependence of shear stress and shear viscosity showed that aqueous lentinan is a typical shear-thinning fluid, possessing potential as a viscosity control agent, and that a weak gel with entangled network structure formed. The dynamic oscillatory behavior of lentinan in the temperature range of 1-15 degrees C was also investigated by rheologic method. The storage modulus G' and complex viscosity eta* increased first with decreasing temperature, and underwent a maximum centered at 7-9 degrees C, and then decreased with further decreasing temperature. This abnormal phenomenon was ascribed to formation of rigid structure in the gel state, which was confirmed by the experimental results from micro-DSC. The micro-DSC curves showed that an endothermic peak appeared at 7-9 degrees C for lentinan in water upon heating, which was attributable to the intramolecular order-disorder structure transition similar to triple-helical polysaccharide schizophyllan. Namely, at lower temperature, the side glucose residues of lent...Continue Reading

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Citations

Mar 19, 2013·Carbohydrate Polymers·Motonari ShibakamiMasahiro Hayashi
Sep 9, 2015·Food & Function·Xiaojun Huang, Shaoping Nie
Nov 19, 2013·Critical Reviews in Food Science and Nutrition·Xiaofei XuXuewu Zhang
Jun 12, 2009·Critical Reviews in Microbiology·S SoltanianP Bossier
Sep 29, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Fengzhi LyuLina Zhang
Aug 7, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Qingye LiuLina Zhang
Jul 17, 2009·The Journal of Physical Chemistry. B·Xiaohua WangYanwei Ding

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