Table 1. Concentration level of taste compounds for detection threshold.

Taste	Taste compound	Level 1 (g/l)	Level 2 (g/l)	Level 3 (g/l)	Level 4 (g/l)	Level 5 (g/l)
Sweet	Sucrose	3.0	6.0	9.0	12.0	16.0
Sour	Citric acid	0.05	0.1	0.16	0.2	0.25
Salty	Sodium chloride	0.2	0.4	0.8	1.2	1.6
Umami	Monosodium glutamate	0.1	0.3	0.6	1.2	1.5
Bitter	Caffeine	0.05	0.1	0.15	0.2	0.27
Bitter	Quinine	0.0014	0.0017	0.0023	0.0038	0.006