| 摘要 |
PROBLEM TO BE SOLVED: To provide a composition which is stable in the paunches (lumens) of ruminants and is elutable in the abomasum and subsequent digestive organs by chemically modifying amino acid. SOLUTION: This composition contains at least one kind of the N-acyl- aspartyl dipeptide expressed by the formula (R is a lower fatty acid acyl group, such as formyl group, acetyl group or propionyl group, benzyloxycarbonyl group, ternary butyloxycarbonyl group, benzoyl group, paratoluenesulfonyl group; Asp is an aspartic acid residue; X is a methinion residue, glutamic residue, alanine residue, valine residue, isoleucine residue or phenyl alanine residue) and its salt. The compd. of the formula is obtd. by bringing N-acyl-aspartic anhydride and neutral amino acid into reaction in acetic acid. |
