Stoichiometric and kinetic values of phenolics against DPPH (2,2-diphenyl-1-picrylhydrazyl) were determined for Andean purple corn (Zea mays L.) and red sweetpotato (Ipomoea batatas). Both crops had higher antioxidant capacity and antiradical kinetics than blueberries and higher or similar anthocyanin and phenolic contents. The second-order rate constant (k(2)) was 1.56, 1.12, 0.57, and 0.26 (m...

Many pine bark extracts have antioxidant properties. This work examined bench scale extraction on the yield, the composition and antioxidant properties of Pinus radiata. Acetone solvent (98.7% w/w at 120 °C) yielded maximum phenols concentration, tannins concentration, anti-radical activity (DPPH) and reducing activity (FRAP), although its extraction yield was the lowest. When the organic solve...

CHEMICAL COMPOSITION AND PHOTOPROTECTIVE ANTIRADICAL ACTIVITIES OF THE BRANCHES Platonia insignis (CLUSIACEAE). The chemical study of the branches enabled isolation biflavonoid morelloflavone and identification, by mass spectrometry, over 14 polyphenols, including seven biflavonoids three derivatives, two benzophenones, one xanthone. in vitro biological tests solar photoprotection antiradical a...

the majority of the antioxidant and antidiabetic activities of fruits are anthocyanins, a group of polyphenolics that are responsible for the color of many fruits, vegetables and flowers. the harvesting time, storage conditions, maturity, extraction steps etc. are very important for the biological activities based on the alteration of chemical composition. the free radical scavenging and antidi...

Nowadays, green synthesis of metal nanoparticles has become a promising synthetic strategy in nanotechnology and materials sciences. In this research, biosynthesis of silver nanoparticles (AgNPs) was successfully accomplished in the presence of Prosopis farcta fruit extract as a reducing agent. Proceeding of the reaction was assessed by using UV–vis spectroscopy. Characterization of silver nano...

Pro-inflammatory enzymes play a key role in inflammatory processes and are potential targets of anti-inflammatory drugs. In this study, the objective was to evaluate antiradical activity extracts their ability inhibit phospholipase A 15-lipoxygenase activity. The hydroethanolic extract revealed strongest reducing power with an IC 7.29 ± 0.61 µg/mL. three most active on PLA were (IC 21.43 0.66 ?...

The present investigation has been carried out to determine the antioxidant activity of the methanolic extracts obtained from four cultivars of cowpea (Vigna unguiculata (L) Walp.) seeds. Phenolic compounds present in the extracts showed the antioxidant and antiradical properties when investigated using a linoleic acid peroxidation model, FRAP, ORAC and TRAP assays, as well as DPPH, hydroxyl, n...

• Bee species, not the two harvesting methods, influenced variation in honey properties. The honeys exhibited antiradical activity, likely derived from phytochemical. Some quality parameters deviated set limits for Apis mellifera honey. We investigated effect of bee species identity and methods on chemical composition activity 53 samples, produced by six stingless western Kenya (Kakamega forest...