| 摘要 |
Products rich in plant cell wall, originating, for example, from higher plants which are naturally rich in pectins, from algae or from by-products, such as wheat bran, potato pulp, oil mill shells or residues, and the like, are modified so as to contain a fraction of water-soluble polysaccharides which is higher than, in particular which is equal to at least twice, that existing naturally, without modification of their overall chemical composition. To obtain them, water is added if need be to the natural product in the divided state, to form a mixture suitable for being subjected to a shearing treatment, and the resulting product is subjected to a shearing force before extrusion, resulting in modified products as aggregates which can be converted into powder. After aqueous extraction, conducted directly on the extruded product, a water-soluble fraction is obtained, from which, for example, pectins are isolated, with a degree of methylation >75%, and the extraction residue which, after drying and grinding, can be employed as alimentary fibres, like the extruded product which, having a low water content, can be employed directly. |
