ABSTRACT
Shinkai’s team also has an efficient heterobireceptor signaling system 99 which has as its target D-galactouronic acid [184-185]. The phenanthrolineZn2+ complex serves as the fluorophore and also as the receptor for the car-
boxylate group of the uronic acid. Fluorescence enhancement factors of 3.5 are achievable. Saccharides lacking the acid group, such as fructose, produce en hancement factors of 1.6-small but not insignificant. This is because 99 has only one PET process centered on the aminomethylphenyl boronic acid moiety.
