From the known phytochemicals, the six C-glycosyl flavones
(shown in Figure 1), shaftoside (1), isomollupentin 7-O-[beta]-glucopyranoside, orientin (2), isoorientin (3), vitexin (4), and isovitexin (5) isolated from the methanolic extract of C.
Feeding response of corn earworm larvae (Lepidoptera: Noctuidae) on corn silks of varying flavone
Concentrations of flavone
aglycones, DHPPG, and (+)-catechin were significantly lower in fertilized saplings (Table 1, [ILLUSTRATION FOR FIGURE 2 OMITTED]).
In contrast, the chromenone ring system of the flavone
molecule faces a larger, negatively charged, and hydrophilic cavity, which includes hydroxyl and carbonyl groups of Gly120, Ser125, Tyr133, and Glu202.
Chen, "Protective effect of total flavones
of rhododendra on ischemic myocardial injury in rabbits," The American Journal of Chinese Medicine, vol.
3.7- dihydroxy flavone
(2.5 mg/kg, 5 mg/kg, and 10 mg/kg), 3,3'-dihydroxy flavone
, 6,3'-dihydroxy flavone
, and 5,6-dihydroxy flavone
(5 mg/kg,10 mg/kg, and 20 mg/kg) were used.
The UV ([[lambda].sub.max]) spectrum and IR ([cm.sup.-1]) absorption bands were similar to flavone
. The MS gives M.F C21H21O10 showing peak at m/z 433.
These two profiles were among the most complex recorded here (Table 3 and Figure 1), and agreed with the flavone
diversity reported by Kawashty and El-Garf (2000) for other species of Verbena.
are substances of phenolic nature and are characterized by having two benzene aromatic rings united by a bridge with three carbon atoms.
LT molecules have a hydroxyl group at the 3' position on the flavone
skeleton, and a crucial enzyme that introduces the 3'-hydroxyl group on the corresponding precursor has been identified as flavone
3'-hydroxylase (F3'H) (Figure 3).
Kim, "Jaceosidin, a natural flavone
, promotes angiogenesis via activation of VEGFR2/FAK/PI3K/AKT/NF-[kappa]B signaling pathways in endothelial cells," Experimental Biology and Medicine, vol.
Among these organic compounds, it is possible to find phenolic compounds, esters and flavonoids (flavonols, flavones
, flavonones, dihydroflavonols and chalcones), terpenes, steroids, aromatic beta-aldehydes, alcohols, sesquiterpenes and stilbene (Aga et al., 1994; Russo et al., 2002).