Comparison of chemical and functional properties of soluble leaf proteins from four plant species
1991
Sheen, S.J.
Fraction 1 protein (F-1-p) and fraction 2 protein (F-2-p) were isolated from leaf extracts of alfalfa, soybean, sugarbeet, and tobacco. The protein content F-1-p varied from 97.3 to 99.5%, but greater variation existed for F-2-p. SDS-PAGE analyses revealed that F-1-ps shared the 56- and l4-kDa subunits, but the bandings differed among F-2-ps. Positive correlations were obtained for amino acid composition within the protein fractions. Leaf proteins were sparsely soluble in acidic conditions, but the solubility index increased toward higher pHs. Their foaming capacity and stability were similar within and among the species. Tobacco F-1-p had higher water absorption and fat binding capacity than its F-2-p; however, this was not evident in other species. The latter is substantiated by comparable emulsion properties. The present study demonstrated that F-1-p from diverse plant species exhibits similar chemical and functional properties, and in terms of functionality F-2-p is as good as F-1-p as a dietary protein.
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