Tropical Journal of Pharmaceutical Research

Original Research Article | OPEN ACCESS

High Levels of Phytophenolics and Antioxidant Activities in Oryza Sativa - Unpolished Thai Rice Strain of Leum Phua

Prasit Suwannalert¹ , Sirichet Rattanachitthawat²

¹Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok 10400; ²Faculty of Agricultural Technology, Burapha University Sakaeo Campus, Sakaeo 27160, Thailand.

For correspondence:- Prasit Suwannalert Email: parasit109@yahoo.com Tel:+6622015550

Received: 14 February 2011 Accepted: 30 June 2011 Published: 20 August 2011

Citation: Suwannalert P, Rattanachitthawat S. High Levels of Phytophenolics and Antioxidant Activities in Oryza Sativa - Unpolished Thai Rice Strain of Leum Phua. Trop J Pharm Res 2011; 10(4):431-436 doi: 10.4314/tjpr.v10i4.8

© 2011 The authors.
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Abstract

Purpose: To investigate phenolic levels, phytophenolic profiles and total antioxidant activities of Oryza sativa, unpolished Thai rice.

Methods: Unpolished Thai rice strains of Leum Phua, Klam, Hawm Nil and Black Rose were measured for antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2’-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) and ferric reducing antioxidant power (FRAP) methods. Phytophenolic chromatograms were obtained by a high performance liquid chromatography (HPLC) technique. Additionally, phenolic content and anthocyanin pigment were also assayed.

Results: Oryza sativa, unpolished Thai rice strain of Leum Phua showed the highest antioxidant activity. It was also highest in anthocyanin pigment. The strains of Leum Phua, Klam, Hawm Nil and Black Rose showed high levels of phenolic content: 1.36±0.03, 0.78±0.02, 0.61±0.01 and 0.57±0.02 mg gallic acid/ g sample, respectively. Interestingly, phytophenolic chromatogram and anthocyanin pigment levels showed a strong correlation.

Conclusion: Oryza sativa, unpolished Thai rice strain of Leum Phua, has high levels of anthocyanin pigment, phenolic content and antioxidant activity. Its pure phytochemical contents should be further studied for their pharmaceutical benefits.

Keywords: Antioxidant, Oryza sativa, Phenolics, Anthocyanin, Phytochemicals, Thai rice