Table 6 Free amino acid contents in Doenjang according to manufacturing method of soybean paste during fermentation period (mg/L)

Compounds	NaCl (%)	8				12
	Fermentation period (week)	0		24		0		24
	Doenjang group	Soaking Doenjang	Non-soaking Doenjang	Soaking Doenjang	Non-soaking Doenjang	Soaking Doenjang	Non-soaking Doenjang	Soaking Doenjang	Non-soaking Doenjang
	Alanine		62.01	29.74	47.61	24.50	126.80	113.03	89.37	97.81
	Ammonia		ND1)	ND	ND	ND	ND	ND	ND	ND
Anserine		ND	ND	ND	ND	ND	ND	ND	ND
Arginine		13.56	31.24	25.72	25.70	0.29	0.79	1.08	0.67
Aspartic acid		63.60	21.92	46.65	20.21	193.92	153.25	114.75	125.98
α-Aminoadioic acid		9.42	13.84	9.95	12.00	3.49	6.00	6.62	7.70
α-Aminobutyric acid		1.95	2.38	1.06	2.16	0.47	0.59	0.17	0.43
β-Alanine		5.38	8.13	5.97	7.24	12.79	16.29	11.33	13.08
γ-Aminobutyric acid		5.99	8.53	6.75	7.58	4.16	7.20	4.77	6.22
β-Aminoisobutyric acid		14.09	16.15	13.77	13.24	5.86	10.44	9.26	9.40
Carnosine		3.94	0.83	0.88	12.38	8.86	ND	5.91	ND
Citrulline		64.69	12.66	41.74	11.47	48.23	60.96	74.92	70.46
Cystathionine		ND	0.58	ND	0.52	0.46	0.26	ND	ND
Cysteine		ND	ND	ND	ND	ND	ND	ND	ND
Ethanolamine		278.83	187.64	248.29	188.68	485.08	420.25	374.78	389.35
Glutamic acid		181.05	82.11	127.26	68.97	336.63	279.73	222.59	247.46
Glycine		41.24	11.73	28.65	10.00	108.58	89.96	60.64	68.38
Histidine		30.01	11.79	22.39	11.94	54.06	48.55	38.58	41.87
Hydroxylysine		ND	ND	ND	ND	ND	ND	ND	ND
Hydroxyproline		ND	ND	ND	ND	ND	ND	ND	ND
Isoleucine		59.38	17.36	43.04	14.42	133.86	113.64	95.53	99.83
Leucine		97.44	43.02	75.35	33.32	202.57	180.44	146.62	156.04
Lysine		95.16	61.84	80.76	53.34	153.83	153.57	124.70	139.36
Methionine		16.63	7.56	12.83	5.81	32.94	27.84	22.90	24.61
3-Methylhistidine		ND	1.98	ND	3.97	ND	1.05	ND	1.18
Ornithine		29.64	25.07	25.76	21.93	42.25	58.44	38.94	42.31
Phenylalanine		69.32	32.18	53.49	26.36	123.75	109.69	92.53	95.75
Phosphoethanolamine		ND	ND	ND	ND	ND	ND	ND	ND
Phosphoserine		ND	ND	ND	ND	ND	ND	ND	ND
Proline		ND	ND	ND	ND	ND	ND	ND	ND
Sarcosine		ND	5.13	1.96	3.22	ND	ND	0.92	1.17
Serine		62.66	17.80	43.25	14.18	139.99	128.93	102.77	111.30
Taurine		ND	ND	ND	ND	ND	ND	ND	ND
Threonine		44.39	12.91	32.93	10.54	103.74	92.97	75.04	80.70
Tryptophan		ND	ND	ND	ND	ND	ND	ND	ND
Urea		33.34	16.70	12.95	12.45	ND	ND	ND	ND
Valine		53.42	21.63	38.98	19.58	139.30	116.05	95.70	100.73
Total		1,384.42	725.09	1,088.25	654.04	2,544.19	2,248.29	1,888.92	1,985.31

ND, not detected.