Antioxidant Activity of the Essential Oil and Oleoresin ofZingiber OfficinaleRoscoe as Affected by Chemical Environment

Abstract

Three different biochemical test systems were chosen based on their solubility to study the antioxidant activity of ginger extracts. Reducing power and DPPH . scavenging activity tests were considered to produce hydrophilic environments and the H 2 O 2 test was considered as creating a lipophilic environment. The average yields were 10.23 ± 1.02% and 0.48 ± 0.19% for oleoresin and essential oil, respectively. The content of total phenols was 67.6 ± 1.08 mg GAE/g of dry extract. In terms of EC 50 , in hydrophilic environment standards, it showed the highest effects compared to ginger extracts, with oleoresin presenting more activity than essential oil. In contrast, except for quercetin, essential oil showed the best scavenging activity in inhibiting H 2 O 2 compared to all other antioxidants. The present work demonstrated that, when using reducing power, DPPH· free radical scavenging and H 2 O 2 scavenging assays, the same ginger extracts exhibit different antioxidant activities, which were affected not only by the extract itself but also by the chemical environment (hydrophilic/lipophilic).

Laurus nobilis, Zingiber officinale and Anethum graveolens Essential Oils: Composition, Antioxidant and Antibacterial Activities against Bacteria Isolated from Fish and Shellfish

“…These activities can be attributed to the high content in monoterpene hydrocarbons and oxygenated monoterpenes in the essential oil [54]. Additionally, ginger is one of the most widely used herbs that contains several interesting bioactive constituents and possesses health promoting properties [55,56,57]. Previous results have shown the antioxidant activities of ginger essential oil and their bioactive components.…”

“…It was also reported that compounds such as α-pinene, α-terpineol and geraniol, present at low concentrations in the zinger essential oil, affected the overall efficiency of the antibacterial activity of the oil, indicating a synergistic effect of all components. Using the incorporation method, Bellik and co-workers reported that the MICs values of ginger essential oil ranged from 8.69 mg/mL for S. aureus , 86.92 mg/mL for B. subtilis and 173.84 mg/mL for E. coli strains [57].…”

Zingiber officinale Rosc. essential oil, a review on its composition and bioactivity

“…The antioxidant evaluation of Chinese ginger essential oil had EC 50 (mg/ml) of 63.23, 11.68 and 0.118 in reducing power, DPPH scavenging and H 2 O 2 scavenging assays. The corresponding EC 50 for ascorbic acid were 0,.025, 0.005, 0.478, respectively and for quercetin were 0.017, 0.002, 0.078 [35]. Ginger essential oil also showed antioxidant activity in ABST assay.…”

Pharmacological Effects of Sacred Oils Belonging to Ancient Civilizations

“…The most important benefit of antioxidants is their ability to fight the accumulation of harmful free radicals in the body. Ginger essential oil protect the cells from these extracellular deleterious radicals, by increasing the liver antioxidant enzyme [26]. All major active ingredients of Ginger, such as zingerone, gingerdiol, zingibrene, gingerols and shogaols, are known to possess anti-oxidant activities [27].…”