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Biomolecular Characterization of Wild Sicilian Oregano: Phytochemical Screening of Essential Oils and Extracts, and Evaluation of Their Antioxidant Activities
Author(s) -
Tuttolomondo Teresa,
La Bella Salvatore,
Licata Mario,
Virga Giuseppe,
Leto Claudio,
Saija Antonella,
Trombetta Domenico,
Tomaino Antonio,
Speciale Antonio,
Napoli Edoardo M.,
Siracusa Laura,
Pasquale Andrea,
Curcuruto Giusy,
Ruberto Giuseppe
Publication year - 2013
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.201200219
Subject(s) - phytochemical , chemistry , thymol , essential oil , polyphenol , flavones , antioxidant , chemotype , food science , chromatography , traditional medicine , botany , organic chemistry , biochemistry , biology , medicine
An extensive survey of wild Sicilian oregano was made. A total of 57 samples were collected from various sites, followed by taxonomic characterization from an agronomic perspective. Based on morphological and production characteristics obtained from the 57 samples, cluster analysis was used to divide the samples into homogeneous groups, to identify the best biotypes. All samples were analyzed for their phytochemical content, applying a cascade‐extraction protocol and hydrodistillation, to obtain the non volatile components and the essential oils, respectively. The extracts contained thirteen polyphenol derivatives, i.e. , four flavanones, seven flavones, and two organic acids. Their qualitative and quantitative characterization was carried out by LC/MS analyses. The essential oils were characterized using a combination of GC‐FID and GC/MS analyses; a total of 81 components were identified. The major components of the oils were thymol, p ‐cymene, and γ ‐terpinene. Cluster analysis was carried out on both phytochemical profiles and resulted in the division of the oregano samples into different chemical groups. The antioxidant activity of the essential oils and extracts was investigated by the Folin Ciocalteau (FC) colorimetric assay, by UV radiation‐induced peroxidation in liposomal membranes (UV‐IP test), and by determining the O $\rm{{_{2}^{{^\cdot} -}}}$ ‐scavenging activity.