Abstract
Juice was extracted from lucerne (cv. Miechowska) harvested at budding stage. Fresh juice contained 4.7% of dry matter and 2.6% of crude protein. Juice protein was coagulated with heat or by addition of hydrochloric acid, butanol, a high molecular weight synthetic flocculant (Prestol) or aluminium sulphate. There were no distinct differences in the recovery of juice dry matter, crude protein, ether extract, fibre or ash in the precipitates obtained with the first four treatments. The concentrate coagulated with Al 2(SO 4) 3 differed in composition from the others. This concentrate was extremely poor in carotene, had a lower ether extract and a high ash content. There were some differences in amino acid composition of proteins, but they were not consistent with differences in their nutritive value. In spite of its low content of some essential amino acids, the protein precipitated with Prestol had the highest nutritive value (BV = 54, NPU = 47). Nutritive value of protein precipitated with butanol was the lowest (BV = 37, NPU = 30).
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