Antioxidant and Antimicrobial Activities of Essential Oils Obtained from Oregano (Origanum vulgare ssp hirtum) by Using Different Extraction Methods

Date

2011-06-01

Author

KARAKAYA, SİBEL
EL, SEDEF NEHİR
Karagozlu, Nural
Şahin, Serpil

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In this study, antioxidant and antimicrobial activities of essential oils obtained from oregano (Origanum vulgare ssp. hirtum) were determined by using solvent-free microwave extraction (SFME), supercritical fluid extraction, and conventional hydrodistillation (CH) methods. The inhibitory effects on the 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical of essential oils obtained from oregano by using SFME and CH were similar. However, essential oil extracted by CH showed greater (2.69 mu mol/mL of oil) Trolox equivalent antioxidant capacity (TEAC) than oregano oils obtained by SFME (P<.05). The difference between percentage inhibition and TEAC values most probably is due to the fact that undiluted and diluted samples are used in the percentage inhibition assay and the TEAC assay, respectively. TEAC values of oregano essential oils obtained by SFME at different microwave power levels were found to be similar and ranged from 0.72 to 0.84 mu mol/mu L of oil. Essential oils obtained by CH and SFME at different microwave powers inhibited the survival of Listeria monocytogenes, Salmonella typhimurium, and Escherichia coli O157:H7, whereas survival of Staphylococcus aureus was not influenced. In addition, oregano oil obtained by SFME at 40% power level did not show any inhibitory effect on E. coli O157:H7.

Subject Keywords

Nutrition and Dietetics, Medicine (miscellaneous)

URI

https://hdl.handle.net/11511/45837

Journal

JOURNAL OF MEDICINAL FOOD

DOI

https://doi.org/10.1089/jmf.2010.0098

Collections

Department of Food Engineering, Article

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Citation Formats

S. KARAKAYA, S. N. EL, N. Karagozlu, and S. Şahin, “Antioxidant and Antimicrobial Activities of Essential Oils Obtained from Oregano (Origanum vulgare ssp hirtum) by Using Different Extraction Methods,” JOURNAL OF MEDICINAL FOOD, pp. 645–652, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/45837.