Table 1. Free sugar contents of onion juice (OJ), black onion juice (BJ), onion vinegar (OV), and black onion vinegar (BV)

Free sugars	Contents (g/L)
	Not fermented		Fermented
	OJ1)	BJ	OV	BV
Fructose	101.5±5.442)	124.4±6.22	19.7±1.10	42.6±2.40
Glucose	127.5±5.14	82.1±1.20	21.4±1.36	37.5±2.30
Sucrose	10.6±0.30	3.5±0.37	4.8±0.17	-3)
Lactose	-	1.2±0.17	4.8±0.53	-
Total	239.6±1.71	211.2±0.99	50.9±0.86	80.1±4.70
Brix°	27.5	25	5.4	9.8

OJ, onion juice; BJ, black onion juice; OV, onion vinegar; BV, black onion vinegar.
Values are mean±SD (n=3).
Not detected.