Table 3. Changes in free amino acids of meat from pigs fed processed sulfur during aging.

Amino acid (mg/100g)	Supplementation			Aging time (d)					p-value
	NP	SP	SEM	0	3	7	14	21	SEM	Supplementation	Time	Interaction
Asp	6.7103	9.1806	0.58	2.24c	2.51c	3.96c	11.18b	19.84a	2.16	0.088	0.001	0.447
Glu	161.9537	161.7992	17.64	117.55c	111.96c	144.96c	194.96b	239.95a	11.74	0.989	<0.001	0.611
Asn	27.1634	26.9343	4.53	15.44c	14.28c	22.36c	34.69b	48.47a	2.39	0.920	<0.001	0.459
Ser	73.7565	74.824	9.52	49.75cd	45.95d	67.09c	92.24b	116.43a	5.93	0.849	<0.001	0.449
Gln	105.9815	110.6208	1.71	99.03ns	93.64	106.59	126.58	115.67	9.53	0.093	0.162	0.338
His	30.171	28.6223	4.33	18.31c	17.66c	24.43c	36.73b	49.86a	2.42	0.482	<0.001	0.355
Gly	58.9448	62.4699	6.88	45.84cd	38.96d	56.12bc	70.81b	91.81a	4.92	0.437	<0.001	0.383
Thr	63.5952	63.309	8.98	40.22cd	37.44d	54.98c	79.97b	104.65a	4.95	0.952	<0.001	0.485
Arg	60.3796	69.7159	7.64	45.44c	43.10	61.05bc	83.15ab	92.49a	7.18	0.177	0.002	0.600
Ala	511.968	501.2456	21.59	451.86c	431.07c	528.82b	532.11b	589.18a	17.20	0.433	<0.001	0.037
Tau	72.8372	71.9731	2.63	77.49a	63.38b	78.44a	70.10ab	72.63ab	3.29	0.735	0.035	0.040
Tyr	47.4961	51.7935	5.49	34.23c	33.35c	47.73b	61.40a	71.51a	4.12	0.279	<0.001	0.560
Val	57.7023	60.0223	9.00	35.23c	34.79c	49.02c	73.34b	101.93a	4.83	0.591	<0.001	0.296
Met	42.5924	42.6349	5.10	28.14d	27.99d	38.59c	52.33b	66.03a	2.39	0.098	<0.001	0.348
Trp	21.1916	21.8912	1.23	18.29c	17.92c	21.12b	23.11b	27.26a	0.78	0.308	<0.001	0.263
Phe	49.0572	50.0997	6.14	33.63d	32.04cd	44.09c	59.56b	78.57a	3.31	0.737	<0.001	0.413
Ile	44.0688	45.9961	6.39	28.02c	27.36c	38.67c	55.94b	75.17a	3.38	0.545	<0.001	0.443
Leu	85.9777	89.8923	11.10	59.00cd	56.21d	78.15c	106.31b	140.01a	6.20	0.502	<0.001	0.444
Lys	92.7646	99.9375	13.51	63.04b	56.15b	86.61b	128.93a	147.03a	11.05	0.523	0.001	0.736
Pro	45.854	48.9553	1.20	32.38b	31.10b	41.40b	56.43a	75.72b	4.71	0.082	<0.001	0.250
TFAA2)	1661.636	1690.448	149.27	1295.12d	1216.85cd	1594.17c	1949.86b	2324.20a	98.6	0.763	<0.001	0.525

¹⁾NP, normal diet fed pigs; SP, sample from 0.3% processed sulfur fed pigs. ²⁾TFAA, total free amino acid ³⁾ Different superscript letters in the same row indicate significant differences during aging time, p<0.05.