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Flavonoids from Iochroma gesnerioides

D Alfonso¹, I Kapetanidis

¹Laboratoire de Pharmacognosie, Genève, Switzerland.

Pharmaceutica Acta Helvetiae

|May 1, 1994

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Researchers identified common flavonoids and rare glycosides in Iochroma gesnerioides. This study details the isolation and characterization of these compounds, contributing to Solanaceae family phytochemical knowledge.

Area of Science:

Phytochemistry
Plant Sciences
Organic Chemistry

Background:

The Solanaceae family is known for its diverse secondary metabolites.
Flavonoids are common in Solanaceae, but specific glycoside derivatives can be rare and taxonomically significant.

Purpose of the Study:

To isolate and identify flavonoid aglycones and glycosides from Iochroma gesnerioides.
To investigate the presence of specific 3-sophorose glycosides within the Solanaceae family.

Main Methods:

Isolation of chemical compounds using standard phytochemical techniques.
Structural elucidation and identification primarily through Nuclear Magnetic Resonance (NMR) spectroscopy, including 1H and 13C NMR.

Main Results:

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Two aglycones, kaempferol and quercetin, were successfully isolated.

Three glycosides, isoquercitrin, kaempferol 3-sophoroside, and quercetin 3-sophoroside, were identified.

The 3-sophorose derivatives are noted as being rare within the Solanaceae family, found in only three genera.

Conclusions:

The phytochemical profile of Iochroma gesnerioides includes both common and rare flavonoid derivatives.
The presence of kaempferol 3-sophoroside and quercetin 3-sophoroside supports their limited distribution within the Solanaceae family.
NMR spectroscopy is a key method for identifying these complex plant metabolites.