Chemical constituents from the seed husks of Oryza sativa L.

Abstract

Oryza sativa L. (Family Poaceae) is cultivated in tropical regions as a staple food all over the world. The rice grain husk is considered as a tonic and administered orally to relieve dysentery. The air-dried seeds husks of O. sativa were exhaustively extracted with methanol in a Soxhlet apparatus. The concentrated methanol extract was adsorbed on silica gel and chromatographed on a silica gel column. The column was eluted with petroleum ether, chloroform and methanol successively to isolate four phytoconstituents characterised as 7-ketostigmasterol (1), 3β-benzyloxy-stigmast-7-one-22-en-19-oic acid 29-ethyleneglycol ether (2), sesquaurs-11-en- 2β, 3β,5α-triol (3) and 2′-(1′′β-hydroxypropyl)-7,4′-dimethoxyapigenin (4). These phytoconstituents were identified on the basis of spectral data analysis.

Graphical Abstract

Keywords:

• Oryza sativa husk
• phytoconstituents
• isolation
• structural elucidation

Acknowledgements

The authors express their gratitude to the Director, Central Institute of Medicinal and Aromatic Plants (CSIR), Lucknow for providing infrastructures and other facilities.

Disclosure statement

No conflict of interest was reported by the authors.