Table 2. The Profile of amino acid contents (mg/g) of gelatins obtained from buffalo hide pretreated with different acids, as compared with those of bovine skin gelatin

Amino acid	CA 0.6 Ma	AC 1.5 Ma	HA 0.9 Ma	BSGa
Aspartic acid	39.59	56.31	51.70	39.08
Glutamic acid	77.62	109.30	102.61	79.49
Serine	27.39	34.83	38.04	28.99
Histidine	5.49	6.59	7.58	5.67
Glycine	165.40	214.53	230.61	179.63
Arginine	53.14	69.47	78.71	56.66
Alanine	59.83	83.24	81.01	63.50
Tyrosine	5.06	6.06	6.99	3.48
Tryptophan	0.14	ND	0.12	ND
Methionine	6.45	7.62	8.88	7.03
Valine	14.45	19.36	19.96	15.27
Phenylalanine	0.14	ND	0.12	ND
Isoleucine	10.27	12.94	13.38	10.28
Leucine	20.86	27.63	28.91	21.48
Lysine	34.54	47.75	44.11	34.70
Cysteine	ND	ND	ND	ND
Proline	84.01	112.26	113.21	88.14
Hydroxyproline	64.45	29.20	21.80	42.06