Table 4.
Free amino acid contents using different detoxified Rhus verniciflua extract concentrations in vinegar after static fermentation (Unit : ug/mL)

	Free amino acid	Extract content (%)
		0	2	6	10
		Essential amino acid	Threonine	51.98	57.77	53.32	28.13
Valine	105.14		115.49	104.32	66.46
Methionine	59.15		56.88	46.03	15.13
Isoleucine	74.07		81.04	70.29	47.44
Leucine	176.53		189.76	163.85	108.37
Phenylalanine	155.09		169.29	144.20	87.28
Lysine	143.24		145.18	125.75	77.93
Total	713.22		757.65	654.44	402.62
Nonessential amino acid	Aspartic acid	97.21	113.07	106.00	57.79
	Serine	92.11	104.09	95.14	57.61
	Glutamic acid	209.16	262.38	245.88	159.01
	Glycine	90.74	110.24	99.44	59.39
	Alanine	195.81	270.94	231.99	126.11
	Cystine	45.74	57.74	49.63	19.27
	Tyrosine	167.96	187.92	167.37	100.56
	Histidine	67.01	68.23	60.78	35.83
	Arginine	311.87	333.33	283.45	190.30
	Proline	219.73	290.81	273.77	125.61
	Total	1,400.13	1,685.67	1,507.46	873.70
Amino acid derivative	Sarcosine	26.98	84.98	71.12	22.39
	α-Amino adipic acid	10.88	26.66	24.22	4.50
	Urea	19.90	33.75	33.16	0.00
	Phosphoserine	3.90	5.02	5.15	5.41
	α-Amino-n-butyric acid	2.25	18.00	3.24	1.51
	Cystationine	15.91	21.62	16.84	9.93
	β-Alanine	38.89	47.23	42.04	14.85
	β-Amino isobutyric acid	119.28	121.55	100.13	45.25
	γ-Amino-n-butyric acid	34.53	37.28	32.59	17.86
	Ethanol amine	12.76	16.07	14.00	11.93
	Ammonia	25.98	34.93	35.05	14.38
	Hydroxylysine	25.98	28.93	25.96	20.36
	Ornithine	23.62	20.69	17.48	15.19
	3-Methyl histidine	102.07	9.13	7.68	7.16
	Anserine	126.07	125.80	120.40	33.45
	Carnosine	6.60	9.44	7.19	5.65
	Total	595.61	641.09	556.24	229.82
Total		2,858.15	3,255.26	2,877.46	1,592.05