Table 2. Free amino acid composition in chicken breast hydrolysates by commercial proteases

Amino acid	1	2	3	4	5	6	7	8	9	10
Aspartic acid	8.80±1.30^bc	3.52±0.64^a	17.12±2.08^e	5.76±1.07^ab	9.60±1.19^c	11.52±1.76^cd	19.68±3.16^e	9.12±1.84^c	8.48±1.33^bc	12.96±1.78^d
Threonine	5.12±0.78^a	4.48±0.74^a	18.72±1.84^d	4.96±0.88^a	5.60±0.62^ab	8.16±2.26^b	24.80±2.52^e	5.12±0.95^a	6.24±1.11^ab	11.36±2.04^c
Serine	5.28±0.80^ab	4.16±0.60^a	14.4±1.73^d	4.80±1.57^ab	5.6±1.23^ab	7.04±1.03^b	14.88±1.51^d	5.28±0.65^ab	6.88±0.84^b	9.12±1.21^c
Asparagine	3.52±0.50^bc	1.28±0.36^a	18.72±2.29^f	2.56±0.47^ab	2 24±0.66^ab	4.00±0.56^d	17.28±1.46^e	2.40±0.56^ab	3.20±0.68^bc	8.96±1.11^d
Glutamic acid	25.76±2.27^cd	10.40±1.60^a	42.88±2.34^f	17.92±2.46^b	26.24±1.91^cd	25.92±1.98^cd	50.72±3.22^g	28.48±2.10^d	23.20±2.29^c	32.48±2.12^e
Proline	3.84±0.46^a	3.20±0.42^a	6.56±0.95^c	4.00±0.48^a	3.20±0.49^a	2.88±0.42^a	8.88±1.05^d	3.84±0.73^a	3.04±0.42^a	5.12±0.69^b
Glycine	1.76±0.41^a	1.92±0.34^ab	5.76±0.73^d	1.76±0.45^a	3.20±0.37^c	3.84±0.95^c	5.76±0.57^d	1.76±0.57^a	3.52±0.61^c	2.88±0.41^bc
Alanine	10.08±0.46^ab	8.64±0.31^a	21.76±1.07^e	8.80±0.50^a	11.2±1.23^b	15.2±0.77^cd	23.2±1.54^e	10.56±1.01^b	13.92±1.04^c	16.00±1.10^d
Valine	5.92±0.99^a	7.2±0.52^ab	22.56±1.48^d	6.88±0.93^ab	6.88±0.61^ab	8.16±0.34^b	28.8±1.29^e	6.40±0.63^a	7.52±0.59^ab	13.28±0.82^c
Cystine	-¹⁾	-	3.04±0.32^b	-	-	-	3.20±0.28^b	1.12±0.14^a	1.12±0.21^a	1.44±0.24^a
Methionine	8.48±0.69^ab	7.2±0.43^a	13.44±0.63^d	8.8±0.53^b	8.48±0.58^ab	11.84±1.06^c	17.44±0.75^e	8.80±0.43^b	9.60±1.11^b	11.52±0.95^c
Isoleucine	5.12±0.46^a	8.64±0.55^c	18.24±1.33^e	8.00±0.91^c	6.4±0.62^ab	7.52±0.93^bc	27.36±1.22^f	5.44±0.50^a	7.36±0.75^bc	13.28±0.78^d
Leucine	23.84±1.43^a	24.32±0.80^a	40.32±2.32^d	29.28±2.30^b	22.72±2.18^a	28.48±2.00^b	52.80±1.58^e	24.00±1.09^a	24.16±1.04^a	36.32±0.89^c
Tyrosine	7.84±0.93^bc	5.76±0.47^a	15.52±1.11^e	7.36±0.66^ab	7.36±0.65^ab	9.28±0.92^c	20.32±1.47^f	7.84±0.62^bc	8.00±0.87^bc	12.8±1.45^d
Phenylalanine	9.60±0.81^ab	8.96±1.37^a	17.60±0.68^c	11.04±0.99^b	8.64±0.95^a	11.20±0.83^b	25.28±1.59^d	9.92±0.79^ab	10.08±1.08^ab	16.32±0.73^c
β-Alanine	23.04±0.89^e	-	-	6.88±0.28^b	-	-	10.88±1.20^c	16.96±1.26^d	3.36±0.51^a	12.16±1.01^c
BAIBA	26.24±1.01^C	5.12±0.62^a	24.64±1.06^c	12.64±0.96^b	6.72±0.67^a	6.72±0.56^a	38.72±3.01^e	30.24±25.4^d	7.84±1.19^a	25.76±1.76^c
GABA	3.68±0.42	-	-	-	-	4.48±0.52	-	-	-	-
Histidine	2.24±0.28^ab	1.60±0.43^a	10.56±1.00^d	1.76±0.30^a	2.72±0.49^b	3.04±0.39^b	13.12±0.69^e	2.08±0.27^ab	2.88±0.41^b	6.72±0.40^c
Carnosine	4.64±0.74^cd	0.80±0.12^a	2.08±0.18^b	5.44±0.57^d	4.8±0.54^cd	2.40±0.41^b	7.20±0.54^e	4.00±0.23^c	6.40±0.63^e	4.48±0.69^c
Lysine	10.72±0.78^b	7.04±0.65^a	35.84±0.89^e	8.16±0.55^ab	16.32±0.61^c	18.24±0.70^c	42.88±1.23^f	10.56±0.66^b	16.48±0.60^c	30.72±1.03^d
Arginine	10.08±1.56^b	6.72±0.47^a	30.08±1.14^e	7.52±1.44^ab	14.56±1.33^c	15.36±1.44^c	39.52±3.14^f	8.16±1.52^ab	14.40±1.28^c	23.68±1.62^d
Total	205.6±18.96	121.07±11.42	379.84±27.44	164.32±19.24	172.48±17.41	205.29±20.34	492.71±35.03	202.09±19.07	187.68±19.57	307.36±23.81

Not detected.