Tag Archives: Antioxidant activity

Chemical Composition and Antioxidant Activities of the Oleoresin from the Clove Buds (Syzygium Aromaticum) (Published)

The chemical composition and antioxidant activities of the oleoresin from clove buds were investigated in this work. The results showed that 20 compositions of the oleoresin were identified, and eugenol (72.85%) was found to be the main components of the oleoresin, followed by eugenyl acetate (10.54%), β-caryophyllene (4.54%), and d-cadinene (3.88%). The oleoresin from clove buds had the better scavenging capacity against 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2, 2’-azino-bis (3-ethylbenothiazoline-6-sulfonic acid) diammonium salts (ABTS) radicals, and inhibiting lipid peroxidation reaction in lard emulsion, as well as exhibited different protection effects against DNA damage caused by Fe2+ and 2,2′-azobis (2-methylpropionamidine) dihydrochloride (AAPH). And the antioxidant activities of oleoresin showed a dose-response relationship to some degree. However, the oleoresin did not have the protection against protein damage, but had a prooxidant effect on protein oxidative damage.

Keywords: Antioxidant activity, Chemical composition., Free radical, Oleoresin

Chemical Composition and Antioxidant Activities of the Oleoresin from the Clove Buds (Syzygium Aromaticum) (Published)

The chemical composition and antioxidant activities of the oleoresin from clove buds were investigated in this work. The results showed that 20 compositions of the oleoresin were identified, and eugenol (72.85%) was found to be the main components of the oleoresin, followed by eugenyl acetate (10.54%), β-caryophyllene (4.54%), and d-cadinene (3.88%). The oleoresin from clove buds had the better scavenging capacity against 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2, 2’-azino-bis (3-ethylbenothiazoline-6-sulfonic acid) diammonium salts (ABTS) radicals, and inhibiting lipid peroxidation reaction in lard emulsion, as well as exhibited different protection effects against DNA damage caused by Fe2+ and 2,2′-azobis (2-methylpropionamidine) dihydrochloride (AAPH). And the antioxidant activities of oleoresin showed a dose-response relationship to some degree. However, the oleoresin did not have the protection against protein damage, but had a prooxidant effect on protein oxidative damage.

Keywords: Antioxidant activity, Chemical composition., Free radical, Oleoresin

Effects of Extraction Solvents on Phytochemicals and Antioxidant Activities of Walnut (Juglans Regia L.) Green Husk Extracts (Published)

The effects of extraction solvents (hexane, ethyl-acetate, acetone, ethanol, methanol, and water) on the content of phytochemicals including total polyphenols, flavonoids and condensed tannins, as well as antioxidant activities of walnut green husk were investigated. The results showed that extraction solvents significantly affected phytochemicals content and antioxidant activities of walnut green husk. The acetone, ethanol, and methanol extracts had the higher content of phytochemicals, and they exhibited stronger antioxidant activities, followed by ethyl-acetate and water extracts, and the lowest for hexane extract. These results indicated that selective extraction from walnut green husk, by an appropriate solvent, is important for obtaining fractions with high antioxidant activity, which will be useful for the developing and application of walnut green husk.

Keywords: Antioxidant activity, Extraction Solvent, Walnut Green Husk, phytochemicals

COMPARATIVE STUDY ON ANTIOXIDANT ACTIVITY OF ESSENTIAL OIL FROM WHITE AND BLACK PEPPER (Published)

In this paper, the antioxidant activities of black and white pepper (Piper nigrum L.) essential oils (BEO and WEO) were evaluated and compared based on radical scavenging activities, reducing power, and DNA oxidative damage protection assays. The results showed that EOS exhibited antioxidant activities, and DNA damage protective effect to various extents. For BEO and WEO, they showed a concentration-dependent antioxidant activity at some concentrations. On the whole, WEO exhibited higher antioxidant activity than BEO. These results suggest that the essential oil of white pepper and black pepper may be a new potential source as a natural antioxidant.

Keywords: Antioxidant activity, Damage protective effect, Essential oil, Pepper