Absolute Antioxidant Activity of Five Phenol-Rich Essential Oils
In: Molecules, Vol 26, Iss 5237, p 5237 (2021, Jg. 26 (2021), Heft 5237, p 5237
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Zugriff:
Essential oils (EOs) have promising antioxidant activities which are gaining interest as natural alternatives to synthetic antioxidants in the food and cosmetic industries. However, quantitative data on chain-breaking activity and on the kinetics of peroxyl radical trapping are missing. Five phenol-rich EOs were analyzed by GC-MS and studied by oxygen-uptake kinetics in inhibited controlled autoxidations of reference substrates (cumene and squalene). Terpene-rich Thymus vulgaris (thymol 4%; carvacrol 33.9%), Origanum vulgare , (thymol 0.4%; carvacrol 66.2%) and Satureja hortensis , (thymol 1.7%; carvacrol 46.6%), had apparent k inh (30 °C, PhCl) of (1.5 ± 0.3) × 10 4 , (1.3 ± 0.1) × 10 4 and (1.1 ± 0.3) × 10 4 M −1 s −1 , respectively, while phenylpropanoid-rich Eugenia caryophyllus (eugenol 80.8%) and Cinnamomum zeylanicum , (eugenol 81.4%) showed apparent k inh (30 °C, PhCl) of (5.0 ± 0.1) × 10 3 and (4.9 ± 0.3) × 10 3 M −1 s −1 , respectively. All EOs already granted good antioxidant protection of cumene at a concentration of 1 ppm (1 mg/L), the duration being proportional to their phenolic content, which dictated their antioxidant behavior. They also afforded excellent protection of squalene after adjusting their concentration (100 mg/L) to account for the much higher oxidizability of this substrate. All investigated EOs had k inh comparable to synthetic butylated hydroxytoluene (BHT) were are eligible to replace it in the protection of food or cosmetic products.
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Absolute Antioxidant Activity of Five Phenol-Rich Essential Oils
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Autor/in / Beteiligte Person: | Guo, Yafang ; Pizzol, Romeo ; Gabbanini, Simone ; Baschieri, Andrea ; Amorati, Riccardo ; Valgimigli, Luca |
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Zeitschrift: | Molecules, Vol 26, Iss 5237, p 5237 (2021, Jg. 26 (2021), Heft 5237, p 5237 |
Veröffentlichung: | MDPI AG, 2021 |
Medientyp: | academicJournal |
DOI: | 10.3390/molecules26175237 |
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