title: Microwave-assisted hydrodistillation of essential oil from rosemary.
abstract: Effects of microwave assisted hydrodistillation (MAHD) and conventional hydrodistillation (HD) methods on yield, composition, specific gravity, refractive index, and antioxidant and antimicrobial activities of essential oil of Rosmarinus officinalis L were studied. The main aroma compounds of rosemary essential oil were found as 1,8-cineole and camphor. Trolox equivalent antioxidant capacity (TEAC) values for essential oils extracted by MAHD and HD were 1.52 mM/ml oil and 1.95 mM/ml oil, respectively. DPPH radical scavenging activity of the oils obtained by MAHD and HD were found as 60.55% and 51.04% respectively. Inhibitory effects of essential oils obtained by two methods on linoleic acid peroxidation were almost the same. Essential oils obtained by two methods inhibited growth of Esherichia coli O157:H7, Salmonella typhimurium NRRLE 4463 and Listeria monocytogenes Scott A with the same degree. However, inhibitory activity of essential oil obtained by MAHD on Staphylococcus aureus 6538P was stronger than that of obtained by HD (p < 0.05).
authors.affiliation: Faculty of Engineering, Department of Food Engineering, Ege University, 35100 Izmir, Turkey.
authors.forename: Sibel
authors.initials: S
authors.lastname: Karakaya
authors.affiliation: Faculty of Engineering, Department of Food Engineering, Ege University, 35100 Izmir, Turkey.
authors.forename: Sedef Nehir
authors.initials: SN
authors.lastname: El
authors.affiliation: Faculty of Engineering, Department of Food Engineering, Celal Bayar University, Manisa, Turkey.
authors.forename: Nural
authors.initials: N
authors.lastname: Karagozlu
authors.affiliation: Department of Food Engineering, Middle East Technical University, 06531 Ankara, Turkey.
authors.forename: Serpil
authors.initials: S
authors.lastname: Sahin
authors.affiliation: Department of Food Engineering, Middle East Technical University, 06531 Ankara, Turkey.
authors.forename: Gulum
authors.initials: G
authors.lastname: Sumnu
authors.affiliation: Department of Food Engineering, Middle East Technical University, 06531 Ankara, Turkey.
authors.forename: Beste
authors.initials: B
authors.lastname: Bayramoglu
keywords: Antioxidant activity; DPPH; Essential oils; Microwave-assisted hydrodistillation (MAHD)