Antioxidant effect of oregano (Lippia berlandieri v. Shauer) essential oil and mother liquors
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The conventional steam distillation process for oregano (Lippia berlandieri v. Shauer) essential oil extraction produces large volumes of mother liquor. This residual liquid represents a potential value because the soluble antioxidants it contains. Essential oil and ethyl acetate mother liquor extracts (MLEs) were evaluated for antioxidant activity. Total phenolic content and antioxidant activities by the 2-2′-diphenyl-1-picrylhydrazyl (DPPH) method, by the deoxyribose degradation assay, and by oxidation of low density lipoproteins (LDL) with CuSO4 were evaluated. Oil yield was 4.34%25. Total phenolic content was 151 ± 2.00 and 150.5 ± 0.98 mg of GAE (gallic acid equivalents)/mL for the essential oil and MLEs, respectively. DPPH assay showed a low radical scavenging activity (RSA) for oregano essential oil. Meanwhile MLEs exhibited no significant RSA at low concentrations, but at higher concentrations (100 μg/mL), it was superior to those exhibited by the controls ascorbic acid and butylated hydroxytoluene (BHT). Deoxy-d-ribose assay results for both essential oil and MLEs showed a good hydroxyl radical RSA at the concentrations tested. Essential oil and MLEs delayed induction time effectively. Solubility problems, chemical constituents, and their hydrophilic-lipophilic distribution are key factors that explain samples behavior for an eventual use of these natural products. © 2006 Elsevier Ltd. All rights reserved.
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Antioxidant; LDL oxidation; Mother liquor extracts; Oregano essential oil 1,1 diphenyl 2 picrylhydrazyl; acetic acid ethyl ester; butylcresol; deoxyribose; essential oil; gallic acid; oregano extract; phenol derivative; plant extract; scavenger; analytic method; antioxidant activity; article; chemical composition; concentration (parameters); degradation kinetics; hydrophilicity; lipophilicity; lippia berlandieri shauer; medicinal plant; solubility; Lippia berlandieri; Origanum vulgare
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