Chemical Constituents from the Leaves and Stems of Piper ornatum N.E.Br (Piperaceae) and their Antioxidant Activity

Nik Nur Asyiqin Nik Mohammed Ainul Azman

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Type :	article
Subject :	H Social Sciences
ISSN :	1511-2292
Main Author :	Nik Nur Asyiqin Nik Mohammed Ainul Azman
Additional Authors :	Wan Mohd Nuzul Hakimi Wan Salleh Abubakar Siddiq Salihu
Title :	Chemical Constituents from the Leaves and Stems of Piper ornatum N.E.Br (Piperaceae) and their Antioxidant Activity

Place of Production :	Tanjung Malim
Publisher :	Fakulti Sains dan Matematik
Year of Publication :	2023
Notes :	Malaysian Journal of Chemistry
Corporate Name :	Universiti Pendidikan Sultan Idris
HTTP Link :	Click to view web link

Abstract : Universiti Pendidikan Sultan Idris

Plants of the genus Piper have long been used as medicinal herbs. The chemistry of Piper species has been widely investigated, and phytochemicals investigations led to the isolation of a number of physiologically active compounds. This study was carried out to investigate the phyto - chemicals isolated from the leaf and stem extracts of Piper ornatum. Cold extraction of the dried powdered leaf and stem was employed to extract the phytochemicals according to the polarity gradient of hexane, ethyl acetate, and methanol. The phytochemicals were obtained using chromatography techniques (column chromatography and prep-TLC) and their structures were confirmed by spectroscopic analysis (IR, NMR and MS) and comparison with literature. The isolation was successfully led to the identification of 5,7-dimethoxyflavone (1), 4',7-dihydroxy-3',5',5-trimethoxyflavone (2), 4'-hydroxy-3',5',5,7-tetramethoxyflavone (5) and 3',4',5,5',7-pentamethoxyflavone (6), together with piperine (3) and ?-sitosterol (4). Compounds (2) and (3) showed significant activity towards DPPH radical scavenging (concentration 1,000 ?g/mL) with percentage inhibition of 47.5% and 41.5%, respectively. This study may provide valuable and useful information and indications for further exploring the potential nutraceutical and pharmaceutical applications of the Piper species. 2024 Malaysian Institute of Chemistry. All rights reserved.

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