نتایج جستجو برای: catechol oxidase
تعداد نتایج: 54988 فیلتر نتایج به سال:
BACKGROUND: Ensiling forages often leads to degradation of protein to non-protein nitrogen (NPN), which is poorly utilized by ruminants. Postharvest protein degradation is especially high in alfalfa (Medicago sativa L.). In contrast, red clover (Trifolium pratense L.) has up to 90% less protein loss during ensiling due to polyphenol oxidase (PPO) forming o-quinones from endogenous o-diphenols a...
The catechol-O-methyltranferase (COMT) is one of the main enzymes that metabolise dopamine in the brain. The Val158Met polymorphism in the COMT gene (rs4680) causes a trimodal distribution of high (Val/Val), intermediate (Val/Met) and low (Met/Met) enzyme activity. We tested whether the Val158Met polymorphism is a modifier of the age at onset (AAO) in Parkinson's disease (PD). The rs4680 was ge...
The authors report the synthesis of some bioactive organic compounds which could be pharmacological interest using Dioscorea praehensilis tyrosinase immobilized on calcium-alginate beads. enzymatic these involved pyruvic acid as a source carbonyl groups, ammonia and catechol. Catechol was used substrate parent compound that supplied aromatic ring carbons for reactions. structures novel synthesi...
Haemolymph from late third-instar larvae of the blowflies Calliphora sp. (Karlson & Schweiger, 1961 ; Thomson & Sin, 1970) and Lucilia cuprina (Hackman & Goldberg, 1967) contains phenol oxidase in an inactive or proenzyme form. The anterior end of a late third-instar Sarcophaga larva was pricked with a fine pin and the haemolymph released (approx. 5 0 ~ 1 ) was collected in an ice-cold tube. By...
The flesh of fresh apricots when cut and exposed to the air rapidly develops a brown color due to enzymic oxidation. This phenomenon is of great importance in the freezing and freezing storage of fresh apricots and in the preparation of apricots for canning and drying. In commercial freezing the oxidizing enzymes of this fruit are controlled by treatment with dilute SO2 solution or by covering ...
the electrochemical oxidation and determination of tryptophan (trp) and glutathione (gsh) in the presence of catechol as a homogeneous redox in the aqueous medium were investigated at the surface of a carbon paste electrode modified with multi-walled carbon nanotube (mwcnt-cpe) using cyclic voltammetry (cv), double step potential chronoamperometry and differential pulse voltammetry (dpv) techni...
Catechol (benzenediol) is present in plant-derived products, such as vegetables, fruits, coffee, tea, wine, areca nut and cigarette smoke. Because platelet dysfunction is a risk factor of cardiovascular diseases, including stroke, atherosclerosis and myocardial infarction, the purpose of this study was to evaluate the anti-platelet and anti-inflammatory effect of catechol and its mechanisms. Th...
Earlier study suggested that 3,4-dihydroxytamoxifen (tam catechol), a tamoxifen metabolite, is proximate to the reactive intermediate that binds covalently to proteins and possibly to DNA (). The current study demonstrates that rat and human hepatic cytochrome P-450s (CYPs) catalyze tam catechol formation from tamoxifen (tam), 3-hydroxy-tam (Droloxifene), and 4-hydroxy-tam (4-OH-tam). Higher le...
The results of studies on certain enzymes, hemin chromoproteins, and iron and copper in the tissues of normal, copper-deficient, and iron-deficient swine are reported in this paper. It has been suggested that the enzymes cytochrome oxidase (l-3), uricase (4), tyrosinase (5), plasma polyphenol oxidase (coeruloplasmin) (6), glutathione oxidase (7), and butyryl coenzyme A dehydrogenase (8) either ...
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