Table 3. Rejection and recognition thresholds for various bitter compounds.

Bitter compounds	RjT (mM)		aRcT (mM)
	No Exposure	Exposure	No Exposure	Exposure
l-Tryptophan	60	N.D.	3	N.D.
l-Isoleucine	200	N.D.	3	N.D.
Denatonium benzoate	0.3	3	0.03	0.1
Quinine-HCl	0.01	0.1	0.003	0.03
Caffeine	10	50	3	3
Salicin	50	50	3	5
Epigallocatechin gallate	1	3	0.3	1

N.D., not determined.