Abstract
The effect of the cell-free scenedesmus protein isolated from fresh algae by the-autolysis-butanol treatment and defatted milk powder supplmenting wheat flour protein to improve the nutritive value were examined by determining biological value as an index of the nutritive value of protein.
The bìological value of the isolated scenedesums protein, about 60, is not high, because the protein lacks with sulfur containing amino acids, methionine and cystine. But scince the protein is rich in lysine, it has an availability for the use to improve the nutritive value of wheat flour protein which is low in lysine. The biological value of wheat flour protein was increased to about 76 from 60, when 5%of flour in the experimental diets for rats was replaced with the isolated scenedesmus protein. This effect is comparable on the same level with that of the defatted milk powder, whichincreased the biological value of the flour protein to 71 when 5% of wheat flour in the diets was replaced by it.
