Journal
FRONTIERS IN CHEMISTRY
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2021.739273
Keywords
Withania frutescens L; essential oil; antioxidant; anti-corrosion; chemical composition
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Funding
- Deanship of Scientific Research at King Saud University [RG-1441-360]
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This study evaluated the anticorrosive and antioxidant activities of essential oil from Withania frutescens L., showing potent antioxidant activity in various bioassays and behaving as a suitable corrosion inhibitor in an acidic medium.
The present study was conducted to evaluate the anticorrosive and antioxidant activities of essential oil from Withania frutescens L. In the present study, the extraction of Withania frutescens L. essential oil (Wf-EO) was conducted using hydrodistillation before being characterized by gas chromatographic analysis (GC/MS) and flame ionization detector (GC/FID). Four bioassays were used for antioxidant testing including 2,2-diphenyl-1-picrylhydrazyl (DPPH), total antioxidant capacity (TAC), ferric reducing antioxidant power (FRAP), and beta-carotene bleaching. The inhibiting effect of Wf-EO on the corrosion behavior of mild steel in 1.0 M HCl was conducted by using polarization curves and electrochemical impedance spectroscopy techniques. The yield of Wf-EO was 0.46% including 175 compounds identified by GC-MS. The oil was mostly constituted of camphor (37.86%), followed by thujone (26.47%), carvacrol (6.84%), eucalyptol (3.18%), and linalool (2.20%). The anti-free radical activity of Wf-EO was 34.41 +/- 0.91 mu g/ml (DPPH), 9.67 +/- 0.15 mg/ml (FRAP), 3.78 +/- 0.41 mg AAE/g (TAC), and 89.94 +/- 1.44% (beta-carotene). The Wf-EO showed potent antioxidant activity in all bioassays used for testing. The anticorrosion activity, polarization curves as well as EIS diagrams indicated that the Wf-EO exhibited anticorrosive properties and reacted as a suitable corrosion inhibitor in an acidic medium.
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