The carbohydrate composition of cotyledons and hulls of cultivars of Lupinus angustifolius from Western Australia

Abstract

Abstract:The hulls and cotyledons from three Western Australian cultivars (Gungurru, Yorrel and Danja) of Lupinus angustfolius, all of low alkaloid content, were analysed separately for their carbohydrate content and composition.Only minor differences in composition between these three cultivars were observed. More notably, the cotyledons of all the cultivars contained levels of non-starch polysaccharides (NSP), ranging from 290 to 310 g kg-' dry weight considerably higher than had been measured previously in cultivars of this species. Galactose, arabinose and uronic acid residues accounted for approximately 67%, 13% and 10 %, respectively, of the cotyledon NSP. Although only a small proportion of the cotyledon NSP is soluble, a much larger proportion could be extracted with hot EDTA treatment. The oligosaccharide content of the cotyledons ranged from 74 to 80 g kg-' dry weight. Cotyledons had very low contents of cellulose, lignin and starch. Hulls consisted predominantly of NSP, with values ranging from 856 to 891 g kg-' dry weight. Glucose, xylose, uronic acids and arabinose were the principal sugar residues present reflecting the compositions of the major constituent polysaccharides, cellulose, hemicelluloses and pectins. Only low levels of lignin were measured in hulls. Cotyledon NSP and hulls from these cultivars may have considerable value as sources of dietary fibre in the human diet.

Cell wall polysaccharides of common beans (Phaseolus vulgaris L.)

“…These results are very coherent with the legume seed sugar compositions reported in the literature [11,15,19,20,25,27,33,37]. BHATTY [4] inferred that the lentil cell wall was probably composed of arabinan and arabinogalactan polysaccharides, because such polysaccharides are commonly distributed in the primary cell wall of cotyledonous plants.…”

Pigs experimentally infected withSerpulina hyodysenteriaecan be protected from developing swine dysentery by feeding them a highly digestible diet

“…Greater fermentation occurred with the diets that contained either wheat or lupin. Dehulled lupin grain is a high protein legume which has virtually no starch [27] but contains high levels of fermentable substrates, including 29 % NSP, of which 16% are soluble and 8 % are oligosaccharides [28]. The NSPs and oligosaccharides are fermented in the large intestine to VFAs [7,14,29,30], with a resultant decrease in pH values [11].…”

Lupin kernel fibre-enriched foods beneficially modify serum lipids in men

“…LKFibre is similar to soy kernel fibre in that it has been reported to consist primarily of insoluble cell wall material (Evans & Cheung, 1993). However, consisting of a rhamnogalactoronan backbone, with side chains consisting predominantly of galactose and arabinose, LKFibre has a chemical structure with similarities to pectin (Evans & Cheung, 1993), a soluble fibre known to lower cholesterol (Cerda et al, 1988).…”

“…However, consisting of a rhamnogalactoronan backbone, with side chains consisting predominantly of galactose and arabinose, LKFibre has a chemical structure with similarities to pectin (Evans & Cheung, 1993), a soluble fibre known to lower cholesterol (Cerda et al, 1988).…”