کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
605256 880339 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Plant cell walls: Supramolecular assemblies
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Plant cell walls: Supramolecular assemblies
چکیده انگلیسی

The primary walls of plant cells comprise a large part of our dietary fibre. Their properties depend on the polysaccharides comprising them but also on the manner in which they are interlinked to form the three-dimensional, functional structure of the intact cell wall. This structure is far from homogeneous, but includes local adaptations to withstand local stresses at the cell corners and the margins of intercellular spaces. There is also variation in cell-wall structure at the tissue, organ and species levels. Interlinking of cell-wall polymers by covalent, ionic and hydrogen bonding varies at all these levels and affects the mechanical properties of the cell walls. Cross-linking of pectins in particular, by a variety of covalent as well as non-covalent mechanisms, determines what kind of disruption of the cell wall is necessary to bring them into solution. Solubilisation of pectins has dietary significance in its own right but also leads to an increase in the pore size of the cell wall and hence reduces the extent to which it impedes the entry of enzymes such as α-amylase and the outflow of intracellular macromolecules during the digestion process. The nutritional value of cell walls as ‘dietary fibre’ may then depend on the extent to which the cell walls remain physically intact during the digestion process.

This review explores how cross-linking of the polysaccharides comprising plant cell walls, especially the pectic polysaccharides, influences their physical properties and their modification in the human digestive system.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Hydrocolloids - Volume 25, Issue 2, March 2011, Pages 257–262
نویسندگان
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