Table 3.

Amino acid composition of different sources of collagen ^a

Amino acid	Ox hide gelatinb	Commercial bone gelatinb	Pig skin gelatinb	Whaleskin gelatineb	Ox-bone gelatinb	Human bone collagenb	Human tendon acid extractb	Wallaby tendonb	Sturgeon swim-bladder collagenc	Cod-bone gelatinc	Shark skin gelatinc	Lung-fish skin collagenc	Lung-fish skin gelatinc
Alanine	11.0	11.3	10.7	10.8	10.5	10.9	10.3	10.7	11.6	10.4	11.2	11.7	11.9
Arginine	8.8	9.0	9.1	9.5	9.2	8.8	8.9	9.5	10.0	9.1	9.3	9.1	9.9
Aspartic acid	6.7	6.7	6.7	6.7	7.1	6.7	6.7	7.0	6.9	7.5	6.0	6.6	6.2
Cystine	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Glutamic acid	11.4	11.6	11.3	11.2	11.9	11.4	11.1	11.5	11.4	11.4	10.3	11.9	11.9
Glycine	27.5	27.2	26.4	26.7	25.3	25.8	25.4	25.7	27.7	28.2	26.5	24.0	26.1
Histidine	0.8	0.7	1.0	1.0	1.0	1.0	0.9	0.8	0.8	1.2	1.3	0.8	0.8
Hydroxylysine	1.0	0.8	1.0	1.0	1.1	0.6	1.5	1.4	1.9	1.4	0.8	0.9	1.1
Hydroxyproline	14.1	13.3	13.5	12.8	14.1	14.1	12.6	13.0	11.8	8.3	10.9	9.8	10.8
Isoleucine	1.7	1.5	1.4	1.6	1.7	1.9	1.5	1.3	1.7	1.6	2.7	1.6	1.3
Leucine	3.3	3.5	3.3	3.6	3.9	3.6	3.5	3.7	2.6	3.3	3.3	3.4	2.8
Lysine	4.5	4.4	4.1	4.1	4.1	4.4	3.3	3.8	3.5	3.7	3.8	3.6	3.6
Methionine	0.9	0.6	0.9	0.8	0.8	0.8	0.9	1.1	1.4	2.3	1.6	0.6	0.5
Phenylalanine	2.2	2.5	2.6	2.3	2.9	2.5	2.5	2.8	2.5	2.0	2.4	2.6	2.4
Proline	16.4	15.5	16.2	16.2	14.7	15.3	15.2	14.7	12.8	12.4	13.9	14.8	15.8
Serine	4.2	3.7	4.1	4.7	4.2	4.1	4.1	4.4	5.8	7.9	5.0	4.7	4.7
Threonine	2.2	2.4	2.2	3.1	2.5	2.4	2.3	2.6	3.8	3.2	3.2	3.2	3.0
Tyrosine	0.3	0.2	0.6	0.7	0.6	0.9	0.7	0.8	0.5	0.6	0.3	0.2	0.1
Valine	2.6	2.8	2.8	2.6	2.7	3.0	3.1	2.9	2.3	2.3	2.7	2.6	2.2

^aValues presented are in grams of amino acids per 100 g of protein.

^bData extracted from Eastoe.³²

^cData extracted from Eastoe.³³