Chemical Composition and Active Properties Evaluation of Wild Oregano (Origanum Vulgare) and Ginger (Zingiber Officinale-Roscoe) Essential Oils

Abstract

The compounds in Ginger (Zingiber officinale-Roscoe) essential oil provenience China and wild oregano (Origanum vulgare) essential oil of Romanian origin were identified by GC/MS and their antioxidant and antifungal properties were evaluated. Wild oregano oil was characterized by high content of oxygenated monoterpenes hydrocarbons (84.05%) of which carvacrol was the most abundant (73.85%) followed by b-linalool (3.46%) and thymol (2.29%). Ginger oil had a higher content of sesquiterpene hydrocarbons including zingiberene (31.47%), b-sesquiphellandrene (13.76%), a-curcumene (10.41%), a-farnesene (8.31%) and b-bisabolene (7.55%) but a lower content of oxygenated monoterpenes (7.97%). The high content of oxygenated monoterpens of wild oregano oil is in accordance with total content of polyphenols determined by the Folin�Ciocalteu method (6.71�0.73 mg of gallic acid equivalent per g oil). Ginger oil had only 1.34�0.22 mg gallic acid equivalent per g oil. Wild oregano oils exhibited appreciable in vitro antioxidant activity as assessed by 2, 2`-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and 2,2�-azino-bis (3 ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS). The sample concentration required to scavenge 50% of the DPPH free radicals was 0.76�0.13 mg/mL for wild oregano oil compared to 20.22�2.12 mg/mL for ginger oil. Also, wild oregano oils showed significant inhibitory activity against selected pathogenic fungi (Fusarium oxysporum, Aspergillus flavus and Penicillium expansum). 1�L of oregano oil is sufficient for almost 75% growth inhibition of Aspergillus flavus compared to ginger oil which shows antifungal activity at 240�L for 78% growth inhibition. It can be concluded that wild oregano oil could be used as food preservative in some food products in which Fusarium oxysporum, Aspergillus flavus and Penicillium expansum could grow and have potential to produce health hazards mycotoxines.

Antimicrobial and Phytotoxic Activity of Origanum heracleoticum and O. majorana Essential Oils Growing in Cilento (Southern Italy)

“…However, different studies reported an antifungal activity of plants belonging to Origanum genus. For example, O. dictamnus essential oil is active against the growth of B. cinerea [16]; O. vulgare against P. expansum [17,18] and O. minutiflorum against A. niger [19].…”

The Chemical Reactivity Study of Organotin(IV) 4-aminobenzoates Using Cyclic Voltammetry and Antioxidant Activity Test by the DPPH Method

“…Antioxidant activity test by DPPH method was performed according to a previous method used by others [21][22][23][30][31][32]. Briefly, the compounds to be tested were dissolved in methanol at concentrations of 2; 4; 8; 16, and 32 μM.…”

“…In this study, we aimed to determine the chemical reactivity of the organotin(IV) carboxylate compounds diphenyltin(IV) di-4-aminobenzoate and triphenyltin(IV) 4-aminobenzoate by using cyclic volta-mmetry. We also examined the antioxidant properties of these compounds using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method using a similar procedure applied by others [30][31][32].…”

Comparative lipid and uric acid suppressing properties of four common herbs in high fat-induced obese mice with their total phenolic and flavonoid index

“…Ginger is the rhizome of Zingiber officinale Roscoe belonging to the family of Zingiberaceae and is native in Asia but also grown in Africa, India and other tropical regions [ 33 ]. Z. officinale Roscoe is primarily used in the management of nausea, but it is also used as an anti-inflammatory, a pain remedy, a warming remedy and a cholesterol-lowering herb [ 34 ].…”