Characterization and Potential Use of Cuttlefish Skin Gelatin Hydrolysates Prepared by Different Microbial Proteases

Table 2

Amino acid composition of CSGHs (number of residues/1000 residues).

Amino acids	CSG	A26-CSGH	NH1-CSGH	A21-CSGH	Alcalase-CSGH
Asx^a	63	62	61	62.5	60
Thr^b	23	22	24.6	22.4	22
Ser	49	45	44	42.3	40.7
Glx^a	92	98	96.4	97.4	89.4
Gly	321	320	316	317	318
Ala	81	87.3	85.4	98.6	97.4
Val^b	22	12	13.6	13.5	12.1
Met^b	6	6.3	6.4	6.9	7.1
Ile^b	22	22.6	23.4	22.1	23.1
Leu^b	29	19.7	20.4	18.7	20
Try	5	5.9	6.2	6.1	5.8
Phe^b	10	9.6	9.9	9.3	9.4
His^b	18	15	14	14	17
Lys^b	13	32	34	33	32
Arg	51	53.6	52.7	51.2	52
Cys	0	0	0	0	0
Pro	96	92	94	90	98
Hyp	84	97	98	95	96
TAA^c	1000	1000	1000	1000	1000
THAA^c	587.0	569.5	569.1	576.1	585.1
TEAA/TAA (%)^c	14.3	13.92	14.63	13.99	14.27

aThe aspartic and glutamic acid contents include, respectively, asparagines and glutamine, Asx = Asp + Asn; Glx = Glu + Gln.
^bEssential amino acids.
^cTAA = total amino acids; THAA = total hydrophobic amino acids; TEAA = total essential amino acids.