Abstract
Pectolinarin, a flavone heteroside, was isolated from Distictella elongata (Vahl) Urb. leaves ethanol extract, along with a mixture of ursolic, pomolic and oleanolic acids, besides β-sitosterol. Their structures were established on the basis of spectral analysis (1H and 13C NMR, 1D and 2D) and they were compared with literature. This is the first report on the occurrence of this flavonoid in a species of the Bignoniaceae family.
Highlights
Bignonieae is a large and diverse clade of neotropical lianas
The RP-HPLC profile of the leaves ethanol extract (LEE) from D. elongata has shown the major peaks in the range of 19.0 to 31.0 min
TLC phytochemical screening carried out for LEE indicated the presence of phenols, including flavonoids, terpenoids and/ or steroids (Wagner et al 1984)
Summary
Bignonieae is a large and diverse clade of neotropical lianas. The group is widely distributed in the neotropics, occurring in Central America, Amazonia, the Atlantic forests of eastern Brazil, and the open dry forests and savannahs of Argentina, Bolivia, Brazil, and Paraguay. Leaves ethanol extract (LEE) from D. elongata were phytochemically investigated affording the flavonoid di-O-glycoside pectolinarin (1) along with a mixture of the triterpenoids: ursolic, pomolic and oleanolic acids and β-sitosterol. A portion of the EtOAc:MeOH (1:1) fraction (230 mg) was further purified by preparative reverse phase HPLC separation to give the flavone pectolinarin (17 mg).
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