THE RELATIONSHIP BETWEEN DIETARY-PROTEIN INTAKE AND THE POSTPRANDIAL DIGESTIVE BALANCE OF PLASMA ALANINE, GLUTAMATE AND GLUTAMINE IN RATS AFTER SHORT AND LONG-TERM TREATMENT

The effects of different amounts of dietary protein 10% (I), 5% (II), 15% (III), 50% (IV) casein in the diet/ on postprandial portal-systemi c plasma level differences, i. e. digestive balance (DB), of alanine ( Ala), glutamate (Glu) and glutamine (Gln) were estimated after 7 and 2 1 days in rats. The results showed specific plasma patterns of these a mino acid with a positive DB for Afa in all groups, for Glu in the hyp erprotein groups (IV-7, IV-21) and for Gln at 7 days (groups III-7, IV -7). In contrast, a negative DB for Glu was obtained in the (I-7, II-7 , II-21) and in one normoprotein group (III-7). A tendency for the fev er of amino acids and/or DB to decrease from 7 to 21 days of treatment , was noted in both portal and systemic plasmas, except for Gln in gro ups 1-7 and I-21.