Barbaterpene and Barbatusterol, New Constituents from Plectranthus barbatus Growing in Saudi Arabia

Author(s): Musarat Amina*, Nawal M. Al Musayeib*, Mansour S. Al-Said, Rania A. Al-Zahrani, Sabrin R.M. Ibrahim, Gamal A. Mohamed

Journal Name: Letters in Drug Design & Discovery

Volume 15 , Issue 8 , 2018

Become EABM
Become Reviewer
Call for Editor

Graphical Abstract:


Background: Plectrantus barbatus Andr. (Lamiaceae) has been used in Hindu and Ayurvedic Indian traditional as well as Brazilian folk medicine for the treatment of several diseases. Chemical investigation of different parts of this plant has led to isolation of essential oil, diterpenes (abietane and labdane), flavonoids, phenolic compounds with interesting biological properties. The objective of study was to isolate pure new chemical entities from aerial parts of P.barbatus.

Methods: Different chromatographic methods were used to isolate pure compounds from the ethyl acetate soluble fraction of ethanol extract of P. barbatus. Their chemical structures were verified utilizing various spectroscopic experiments such as NMR (1H, 13C, COSY, HMBC, HSQC), Mass spectrometry (EI-MS experiments) as well as by chemical degradation.

Results: The chemical investigation of ethyl acetate soluble fraction of the ethanol extract of P. barbatus resulted in six compounds, barbaterpene (2) (2`R-hydroxydocosanoylursa-12-en-3β-ol) and barbatusterol (3) new to the literature along with four known compounds, stigmasterol (1), sugiol (4), 11,14-dihydroxy-8,11,13-abietatrien-7-one (5), and caffeic acid (6).

Conclusion: Two new metabolites: barbaterpene (2) (2`R-hydroxydocosanoylursa-12-en-3β-ol) and barbatusterol (3) (3β,5α-dihydroxy-stigma-7(8),22-diene), in addition to stigmasterol (1), sugiol (4), 11,14-dihydroxy-8,11,13-abietatrien-7-one (5), and caffeic acid (6) were separated from the aerial parts of P.barbatus.

Keywords: Plectranthus barbatus, Lamiaceae, triterpene, sterol, barbaterpene, barbatusterol.

Rights & PermissionsPrintExport Cite as

Article Details

Year: 2018
Published on: 20 November, 2017
Page: [851 - 856]
Pages: 6
DOI: 10.2174/1570180814666171120161340
Price: $65

Article Metrics

PDF: 26
PRC: 1