Pectin self-assembly and its disruption by water: insights into plant cell wall mechanics

被引:3
作者
John, Jacob [1 ]
Ray, Debes [2 ]
Aswal, Vinod K. [2 ]
Deshpande, Abhijit P. [1 ]
Varughese, Susy [1 ]
机构
[1] Indian Inst Technol, Dept Chem Engn, Madras, Tamil Nadu, India
[2] Bhabha Atom Res Ctr, Solid State Phys Div, Mumbai, Maharashtra, India
关键词
NONLINEAR ELASTICITY; DEHYDRATION; NETWORKS; GROWTH;
D O I
10.1039/d2cp01479c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Plant cell walls undergo multiple cycles of dehydration and rehydration during their life. Calcium crosslinked low methoxy pectin is a major constituent of plant cell walls. Understanding the dehydration-rehydration behavior of pectin gels may shed light on the water transport and mechanics of plant cells. In this work, we report the contributions of the microstructure to the mechanics of pectin-Ca gels subjected to different extents of dehydration and subsequent rehydration. This is investigated using a pectin gel composition that forms 'egg-box bundles', a characteristic feature of the microstructure of low methoxy pectin-Ca gels. Large amplitude oscillatory shear (LAOS) rheology along with small angle neutron scattering and near infrared (NIR) spectroscopy on pectin gels is used to elucidate the mechanical and microstructural changes during dehydration-rehydration cycles. As the extent of dehydration increases, the reswelling ability, strain-stiffening behavior and yield strain decrease. These effects are more prominent at faster rates of dehydration and are not completely reversible upon rehydration to the initial undried state. Microstructural changes due to the aggregation of egg-box bundles and single chains and the associated changes in the water configurations lead to these irreversible changes.
引用
收藏
页码:22691 / 22698
页数:8
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