Aj. Evans et al., THE CARBOHYDRATE-COMPOSITION OF COTYLEDONS AND HULLS OF CULTIVARS OF LUPINUS-ANGUSTIFOLIUS FROM WESTERN-AUSTRALIA, Journal of the Science of Food and Agriculture, 61(2), 1993, pp. 189-194
The hulls and cotyledons from three Western Australian cultivars (Gung
urru, Yorrel and Danja) of Lupinus angustifolius, all of low alkaloid
content, were analysed separately for their carbohydrate content and c
omposition. Only minor differences in composition between these three
cultivars were observed. More notably, the cotyledons of all the culti
vars contained levels of non-starch polysaccharides (NSP), ranging fro
m 290 to 310 g kg-1 dry weight considerably higher than had been measu
red previously in cultivars of this species. Galactose, arabinose and
uronic acid residues accounted for approximately 67%, 13% and 10%, res
pectively, of the cotyledon NSP. Although only a small proportion of t
he cotyledon NSP is soluble, a much larger proportion could be extract
ed with hot EDTA treatment. The oligosaccharide content of the cotyled
ons ranged from 74 to 80 g kg-1 dry weight. Cotyledons had very low co
ntents of cellulose, lignin and starch. Hulls consisted predominantly
of NSP, with values ranging from 856 to 891 g kg-1 dry weight. Glucose
, xylose, uronic acids and arabinose were the principal sugar residues
present reflecting the compositions of the major constituent polysacc
harides, cellulose, hemicelluloses and pectins. Only low levels of lig
nin were measured in hulls. Cotyledon NSP and hulls from these cultiva
rs may have considerable value as sources of dietary fibre in the huma
n diet.