Supercritical CO2-based tailor made valorization of Origanum vulgare L extracts: A green approach to extract high-value compounds with applied perspectives. (15th February 2019)

• Record Type: Journal Article
• Authors: García-Pérez, J. Saúl; Cuéllar-Bermúdez, Sara P.; Cruz-Quiroz, Reynaldo de la; Arévalo-Gallegos, Alejandra; Esquivel-Hernandez, Diego A.; Rodríguez-Rodríguez, José; García-García, Rebeca; Iqbal, Hafiz M.N.; Parra-Saldivar, Roberto
• Is Part Of: Journal of environmental management. Volume 232(2019)
• Page Start: 796
• Page End: 802
• Publication Date: 2019-02-15
• Subjects: Bio-waste -- Valorization -- Green technology -- Supercritical CO2-based extraction -- Taguchi design -- Antimicrobial -- Antioxidant; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2018.11.117
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: In this study, the supercritical CO2 -based extraction approach was used from the green technologies to extract Oregano oil ( Origanum vulgare L.). A Taguchi experimental design was applied to evaluate the effect of pressure, temperature and ethanol as co-solvent. High yield of oregano oil (13.40%) was obtained at 40 °C, 100 bar and 8 g min −1 of co-solvent flow. Fatty acids profile include α-linolenic, palmitic, oleic and linoleic that contribute to 70.9–76.8% of total fatty acids. Volatile compounds including carvacrol (29.99%), heneicosane (8.21%), nonacosane (11.78%), docosane (7.18%), borneol (4.35%) and thymol (4.51%) were the main compounds identified. Antimicrobial activity assays showed that extracts obtained at 40 °C were highly efficient against S. aureus, E. coli, and C. albicans . Highest antioxidant activities on DPPH and FRAP assays were reached under 8 g min −1 of co-solvent flow (6.08 and 6.89 μmol TE g −1 extract, respectively). On the other hand, antioxidant activity (35.76 μmol TE g −1 ) on ABTS assay was improved at 40 °C, 100 bar, and 4 g min −1 of co-solvent flow. Graphical abstract: Image Highlights: Bio-waste valorization via supercritical CO2 -based extraction approach was exploited. Highest oil yield was obtained from O. vulgare under 100 bar and 8 g min −1 of ethanol. Large percentage of carvacrol was detected at 8 g min −1 of ethanol flow. The oils extracted at 40 °C showed better antimicrobial activities potential.