TABLE I.

Binding Constants for the Complexes Between N-Hydroxy-IQ and Various Compounds in Tea^*

Tea constituent	Kb (× 103 M−1)
EGC	1.1
EGCG	1.0
(+)-catechin	0.95
ECG	0.88
caffeine	<0.5

^*The mutagen was titrated with each tea constituent as shown in Figure 5, and the binding constant was determined from the Benesi-Hildebrand plot (Fig. 6).