Abstract
Sixty-three out of 165 species of trees were found to possess milk clotting ability. Leaf extracts of some trees hydrolyzed κ-casein more rapidly than α s1-casein and β-casein, while those of the other trees digested α s1-casein and/or β-casein as well as κ-casein. Leaf extracts of Albizia julibrissin, Euonymus sieboldianus and Celastrus orbiculatus digested casein components, resulting in some large peptide fragments, and the fragments hardly isappeared despite long incubation. The ratios of milk clotting activity to proteolytic activity of the extracts of Albizia julibrissin, Euonymus sieboldianus and Celastrus orbiculatus, and chymosin were 26.9, 21.6, 23.3 and 34.2, respectively. On the other hand, milk clotting activity was observed not only in leaves but also in the bark and young seeds of Albizia julibrissin.
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