African Journal of Biotechnology Vol. 5 (24), pp. 2428-2432, 18 December 2006   

ISSN 1684–5315 © 2006 Academic Journals        

Full Length Research Paper

Antioxidant activity of the methanolic extracts of some species of Phlomis and Stachys on sunflower oil

Katayoun Morteza-Semnani¹*, Majid Saeedi² and Somayeh Shahani¹

¹Department of Medicinal Chemistry, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran.

²Department of Pharmaceutics, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran.

*Corresponding Author’s E-mail: semnani_k@yahoo.co.uk   Tel/Fax   +98-151-3543082.

Accepted 19 October, 2006

Antioxidant effects of the methanolic extract of Phlomis bruguieri, P. herba-venti, P. olivieri, Stachys byzantina, S. inflata, S. lavandulifolia and S. laxa were tested in sunflower oil stored at 70ºC, by mea-suring peroxide values after regular intervals and compared with rosemary-, green tea- and BHA-containing samples. The methanolic extracts of P. bruguieri and S. laxa were found to be most effective in stabilizing sunflower oil.

Key words: Antioxidant activity, extracts, sunflower oil, peroxide value, Phlomis, Stachys.