Table 3.

Effect of protein restriction on plasma amino acid concentrations

	Portal vein						Artery
	20P			5P			20P			5P
Asp	57.88	±	9.32	47.36	±	9.88	70.44	±	2.39	62.57	±	2.38
Glu	119.36	±	16.87	81.34	±	9.87	94.56	±	5.84	85.06	±	9.38
Ser	354.58	±	49.84	208.98	±	16.87*	250.04	±	21.28	182.79	±	11.1*
Asn	135.76	±	22.13	73.9	±	5.94	74.01	±	6.05	49.98	±	1.93**
Gly	282.54	±	49.93	213.72	±	15.02	169.47	±	27.66	131.28	±	12.83
Gln	3.49	±	1.41	3.38	±	1.42	9.8	±	2.77	7.38	±	0.91
His	138.23	±	12.35	90.87	±	8.07*	115.56	±	6.64	88.99	±	3.48**
Thr	89.45	±	7.13	65.81	±	4.53*	82.95	±	6.33	60.75	±	2.38*
Ala	1222.46	±	139.25	810.39	±	53.87*	711.78	±	16.09	636.44	±	18.72*
Arg	54.32	±	18.01	53.58	±	8.98	30.21	±	5.36	30.61	±	2.08
Pro	9.15	±	0.92	6.88	±	0.27	22.5	±	4.72	15.96	±	2.64
Tyr	145.58	±	12.16	86.78	±	5.74**	123.82	±	6.96	80.86	±	2.90**
Val	303.78	±	27.91	168.17	±	9.07**	242.19	±	12.58	158.55	±	5.34**
Met	78.8	±	7.18	44.08	±	1.78**	66.81	±	3.17	46.28	±	1.82**
Cys	32.53	±	4.03	30.15	±	3.76	3.27	±	0.32	2.65	±	0.4
Ile	167.87	±	18.84	81.74	±	3.19**	116.07	±	6.09	73.87	±	2.35**
Leu	235.63	±	24.88	118.03	±	6.04**	173.42	±	8.99	109.25	±	3.68**
Phe	101.12	±	9.20	66.48	±	3.13	80.37	±	2.43	65.45	±	1.72**
Trp	178.12	±	94.76	36.82	±	7.33	44.32	±	11.76	32.24	±	4.67
Lys	290.25	±	62.6	187.54	±	28.1	235.73	±	43.59	130.83	±	11.21

(nmol/mL)

*p < 0.05, **p < 0.01 vs. 20P

Amino acid abbreviations: Ala alanine, Arg arginine, Asn asparagine, Cys cystine, Gln glutamine, Glu glutamate, Gly glycine, His histidine, Ile isoleucine, Leu leucine, Lys lysine, Met methionine, Phe phenylalanine, Pro proline, Ser serine, Thr threonine, Trp tryptophan, Tyr tyrosine, Val valine, 20P control diet containing 20% casein, 5P low-protein diet containing 5% casein