Table 2. Volatile compounds of farm-made and commercial ‘Kujippong’ vinegars identified detected by electronic nose

Column	RT (s)	Peak area				Compound	Description
		V_A371)	V_B7	CV_A	CV_B
MTX-5	17.50	2,756.2±110.12)	4,799.5±222.5	672.8±121.1	6,631.4±867.8	Acetaldehyde	Fruity, pungent
	19.15	139,073.9±1,437.1	175,459.7±1,747.3	34,035.6±1,250.1	371,877.8±12,960.4	Ethanol	Alcoholic
	22.49	2,763.1±370.5	3,030.2±337.8	7,165.3±461.3	59,374.8±1,090.4	2-Propanol	Alcoholic
	26.38	4,696.1±468.5	6,657.5±492.8	5,148.0±193.5	16,145.5±639.3	Butane-2,3-dione	Caramelized, fruity
	28.76	151,231.7±11,440.7	173,686.5±12,585.0	62,697.5±3,900.1	537,358.5±4,891.0	Ethyl acetate	Acidic, fruity
	30.33	23,482.8±2,468.2	24,893.1±2,272.8	11,567.3±394.5	26,693.9±6,387.5	Acetic acid	Acidic, pungent
	40.27	6,768.0±998.1	10,498.7±1,180.9	2,913.8±235.5	14,390.5±737.7	2-Ethyl furan	Acidic, sweet
MTX-5	42.54	2,585.4±391.2	6,368.5±301.4	ND3)	9,280.3±658.9	Propanoin acid	Acidic, rancid
	44.25	14,935.3±586.3	15,812.4±540.8	6,131.2±218.5	13,643.6±917.4	2-Methyl-1-butanol	Balsamic, malty
MTX-1701	21.93	136,026.8±1,577.5	172,090.4±1,935.6	34,109.8±1,233.6	363,904.2±12,602.4	Ethanol	Alcoholic
	24.30	3,814.4±305.2	4,711.4±221.7	9,289.6±258.9	64,875.2±1,025.2	2-Propanol	Alcoholic
	31.75	72,932.8±388.4	97,156.4±634.3	30,607.1±975.0	503,451.4±5,504.0	Ethyl acetate	Acidic, fruity
	38.58	9,763.4±126.0	10,805.1±49.6	4,539.7±106.9	6,693.8±215.6	Ethyl propanoate	Fruity
	43.31	167,894.7±14,377.8	134,678.5±27,117.3	94,531.7±8,790.8	110,509.0±4,251.6	Acetic acid	Acidic, pungent
	53.22	18,880.3±36.9	19,970.2±549.0	7,922.3±153.9	14,339.2±1,152.9	3-Methyl-1-butanol	Alcoholic, balsamic
	54.53	12,798.5±603.5	17,449.3±2,185.0	7,124.7±1,109.3	18,157.2±2,389.6	2-Methyl-1-butanol	Balsamic, malty

Abbreviation of samples referred to Table 1.
Mean±SD.
Not detected.