Analytical investigation of certain compounds possessing Quinonoid
4] is oxidized to quinonoid
dihydrobiopterin and is recycled to BH4 by pterin-4[alpha]-carbinolamine dehydratase (EC 4.
The degree of oxidation (x) was calculated from the intensity ratio of the quinonoid
peak at ~1570 [cm.
1] corresponding to the stretching deformation of benzonoid and quinonoid
rings, respectively (42-45).
328 and 610 nm, representing the [pi]-[pi]* transition in the benzenoid structure and the exciton formation in the quinonoid
5b shows predominantly the presence of the quinonoid
imine (=N-) structure and the benzenoid amine (-NH-) structure.
It is due to diverse secondary metabolites like polyphenols terpenoids flavonoids quinonoids
and xanthenes that have been reported previously to neutralize snake poison (Asad et al.
Presence of secondary metabolites like xanthenes phenols quinonoids
terpenoids and various flavonoids have previously been documented to inhibit snake venom enzymes.