the pomegranate seeds of four iranian commercial varieties  (abanmahi (ab), malas (ms), pust sefid (ps) and shahvar (sh)) were evaluated in terms of some quality properties including protein, oil, dietary fiber, mineral contents and fatty acid composition. physicochemical properties and antioxidant activity of pomegranate seed oils (psos) were also determined. the oil antioxidant activity was m...

Tyrosinase exhibits catalytic activity for the ortho-hydroxylation of monophenols to diphenols as well as their subsequent oxidation to quinones. Owing to polymerization of these quinones, brown-coloured high-molecular-weight compounds called melanins are generated. The latent precursor form of polyphenol oxidase 4, one of the six tyrosinase isoforms from Agaricus bisporus, was purified to homo...

Phenolics, in addition to color, flavor, nutritional value, and organoleptic properties, are mainly responsible for the oxidative stability of olive oil change according degree maturity processes. In this study, it was aimed optimize malaxation process using response surface method terms yield bioactive constituents, including total phenolic content, ortho-diphenol, free radical scavenging acti...

The total phenols in virgin olive oil are highly dependent on cultivar, but also ripening stage and other agronomic factors. focus of most studies factors has been irrigation, while fertilization received less attention. Most the works find that nitrogen over-fertilization leads to a decrease phenol contents (VOO) extra (EVOO), under rain-fed or irrigation management. Ortho-diphenols with high ...

The problematic increase in multidrug-resistant bacteria translates into the urgent need to discover novel and effective antimicrobial substances. Herein, mushrooms could be a promising alternative of natural source new antimicrobials. present work aimed compare phytochemical composition activity methanol aqueous crude extracts Lentinula edodes var. Koshin Donko. Disk diffusion method was used ...

Tyrosinase is a type 3 copper enzyme that catalyzes the ortho-hydroxylation of monophenols to diphenols as well as their subsequent oxidation to quinones, which are precursors for the biosynthesis of melanins. The first plant tyrosinase from walnut leaves (Juglans regia) was purified to homogeneity and crystallized. During the purification, two forms of the enzyme differing only in their C-term...

Extracellular Neurospora laccase (p-diphenol:oxygen oxidoreductase; EC 1.10.3.2) has been purified to apparent homogeneity by classical purification techniques. The enzyme, which consists of mainly one form, has a molecular weight of 64,800 and contains 11% carbohydrate. The ultraviolet, visible, and electron paramagnetic resonance spectra indicate that both type I and type II copper are presen...

Background: Olive oil is a source of antioxidants and poses positive effects on human health. The objective of this study was firstly to identify and quantify the phenolics of some Algerian olive oils; secondly, the antioxidant activity of the samples was assessed. Methods: The virgin olive oils used in this study were derived from three Algerian cultivars, including Azeradj, Bouchouk, and Che...