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Range of Products

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D.C. Hammell

and Body Human Oxidants The



  • and Body Human Oxidants The
  • Oxidant—Antioxydant system: Role and significance in human body
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  • Indian J Exp Biol. Nov;40(11) Oxidant-antioxidant system: role and significance in human body. Irshad M(1), Chaudhuri PS. Author information. Chronic exercise also leads to the upregulation of the body's antioxidant defence mechanism, which helps minimize the oxidative stress that. The human body is made up of substances like proteins, fats and DNA, When the free radicals (pro-oxidants) outnumber the antioxidants, this.

    and Body Human Oxidants The

    ROS include the radicals superoxide and hydroxyl radical, plus derivatives of oxygen that do not contain unpaired electrons, such as hydrogen peroxide, singlet oxygen, and hypochlorous acid.

    Because they have one or more unpaired electrons, free radicals are highly unstable. They scavenge your body to grab or donate electrons, thereby damaging cells , proteins, and DNA genetic material.

    The same oxidative process also causes oils to become rancid, peeled apples to turn brown, and iron to rust. It is impossible for us to avoid damage by free radicals. Free radicals arise from sources both inside endogenous and outside exogenous our bodies.

    Oxidants that develop from processes within our bodies form as a result of normal aerobic respiration , metabolism, and inflammation.

    Exogenous free radicals form from environmental factors such as pollution , sunlight , strenuous exercise , X-rays , smoking and alcohol. Our antioxidant systems are not perfect, so as we age, cell parts damaged by oxidation accumulate. Source Reference Robin Brett Parnes.

    ROS are produced in the body in day-to-day life by: Some good choices include blueberries, raspberries, apples, broccoli, cabba Antioxidants have been dated in medical literature to the early 19th and 20th centuries, but researchers and health Each nutrient is unique in terms of its structure a Although dietary antioxidants have been investigated for potential effects on neurodegenerative diseases such as Alzheimer's disease , Parkinson's disease , and amyotrophic lateral sclerosis , [18] [19] these studies have been inconclusive.

    Common pharmaceuticals and supplements with antioxidant properties may interfere with the efficacy of certain anticancer medication and radiation. Relatively strong reducing acids can have antinutrient effects by binding to dietary minerals such as iron and zinc in the gastrointestinal tract and preventing them from being absorbed.

    Nonpolar antioxidants such as eugenol —a major component of oil of cloves —have toxicity limits that can be exceeded with the misuse of undiluted essential oils. The beta-carotene and Retinol Efficacy Trial CARET study of lung cancer patients found that smokers given supplements containing beta-carotene and vitamin A had increased rates of lung cancer. While antioxidant supplementation is widely used in attempts to prevent the development of cancer, antioxidants may interfere with cancer treatments, [43] since the environment of cancer cells causes high levels of oxidative stress, making these cells more susceptible to the further oxidative stress induced by treatments.

    As a result, by reducing the redox stress in cancer cells, antioxidant supplements and pharmaceuticals could decrease the effectiveness of radiotherapy and chemotherapy. A paradox in metabolism is that, while the vast majority of complex life on Earth requires oxygen for its existence, oxygen is a highly reactive molecule that damages living organisms by producing reactive oxygen species. Thus, the function of antioxidant systems is not to remove oxidants entirely, but instead to keep them at an optimum level.

    This species is produced from hydrogen peroxide in metal-catalyzed redox reactions such as the Fenton reaction. The use of oxygen as part of the process for generating metabolic energy produces reactive oxygen species.

    This unstable intermediate can lead to electron "leakage", when electrons jump directly to oxygen and form the superoxide anion, instead of moving through the normal series of well-controlled reactions of the electron transport chain. Antioxidants are classified into two broad divisions, depending on whether they are soluble in water hydrophilic or in lipids lipophilic.

    In general, water-soluble antioxidants react with oxidants in the cell cytosol and the blood plasma , while lipid-soluble antioxidants protect cell membranes from lipid peroxidation.

    Some antioxidants are only found in a few organisms and these compounds can be important in pathogens and can be virulence factors. The relative importance and interactions between these different antioxidants is a very complex question, with the various antioxidant compounds and antioxidant enzyme systems having synergistic and interdependent effects on one another.

    Some compounds contribute to antioxidant defense by chelating transition metals and preventing them from catalyzing the production of free radicals in the cell.

    Particularly important is the ability to sequester iron, which is the function of iron-binding proteins such as transferrin and ferritin. Uric acid is by far the highest concentration antioxidant in human blood. Uric acid UA is an antioxidant oxypurine produced from xanthine by the enzyme xanthine oxidase , and is an intermediate product of purine metabolism.

    Uric acid has the highest concentration of any blood antioxidant [76] and provides over half of the total antioxidant capacity of human serum. Ascorbic acid or " vitamin C " is a monosaccharide oxidation-reduction redox catalyst found in both animals and plants.

    As one of the enzymes needed to make ascorbic acid has been lost by mutation during primate evolution , humans must obtain it from the diet; it is therefore a vitamin. In other cells, it is maintained in its reduced form by reaction with glutathione, which can be catalysed by protein disulfide isomerase and glutaredoxins.

    Glutathione is a cysteine -containing peptide found in most forms of aerobic life. In cells, glutathione is maintained in the reduced form by the enzyme glutathione reductase and in turn reduces other metabolites and enzyme systems, such as ascorbate in the glutathione-ascorbate cycle , glutathione peroxidases and glutaredoxins , as well as reacting directly with oxidants. Vitamin E is the collective name for a set of eight related tocopherols and tocotrienols , which are fat-soluble vitamins with antioxidant properties.

    Antioxidants that are reducing agents can also act as pro-oxidants. For example, vitamin C has antioxidant activity when it reduces oxidizing substances such as hydrogen peroxide, [] however, it will also reduce metal ions that generate free radicals through the Fenton reaction. The relative importance of the antioxidant and pro-oxidant activities of antioxidants is an area of current research, but vitamin C, which exerts its effects as a vitamin by oxidizing polypeptides, appears to have a mostly antioxidant action in the human body.

    That is, paradoxically, agents which are normally considered antioxidants can act as conditional pro-oxidants and actually increase oxidative stress. Besides ascorbate, medically important conditional pro-oxidants include uric acid and sulfhydryl amino acids such as homocysteine. Typically, this involves some transition-series metal such as copper or iron as catalyst.

    The potential role of the pro-oxidant role of uric acid in e. Another example is the postulated role of homocysteine in atherosclerosis. As with the chemical antioxidants, cells are protected against oxidative stress by an interacting network of antioxidant enzymes.

    This detoxification pathway is the result of multiple enzymes, with superoxide dismutases catalysing the first step and then catalases and various peroxidases removing hydrogen peroxide. As with antioxidant metabolites, the contributions of these enzymes to antioxidant defenses can be hard to separate from one another, but the generation of transgenic mice lacking just one antioxidant enzyme can be informative.

    Superoxide dismutases SODs are a class of closely related enzymes that catalyze the breakdown of the superoxide anion into oxygen and hydrogen peroxide. Catalases are enzymes that catalyse the conversion of hydrogen peroxide to water and oxygen, using either an iron or manganese cofactor.

    Here, its cofactor is oxidised by one molecule of hydrogen peroxide and then regenerated by transferring the bound oxygen to a second molecule of substrate. Peroxiredoxins are peroxidases that catalyze the reduction of hydrogen peroxide, organic hydroperoxides , as well as peroxynitrite. The thioredoxin system contains the k Da protein thioredoxin and its companion thioredoxin reductase. Plants, such as Arabidopsis thaliana , have a particularly great diversity of isoforms.

    In its active state, thioredoxin acts as an efficient reducing agent, scavenging reactive oxygen species and maintaining other proteins in their reduced state. The glutathione system includes glutathione, glutathione reductase , glutathione peroxidases , and glutathione S -transferases. There are at least four different glutathione peroxidase isozymes in animals. Surprisingly, glutathione peroxidase 1 is dispensable, as mice lacking this enzyme have normal lifespans, [] but they are hypersensitive to induced oxidative stress.

    Oxidative stress is thought to contribute to the development of a wide range of diseases including Alzheimer's disease , [] [] Parkinson's disease , [] the pathologies caused by diabetes , [] [] rheumatoid arthritis , [] and neurodegeneration in motor neuron diseases.

    Here, low density lipoprotein LDL oxidation appears to trigger the process of atherogenesis , which results in atherosclerosis , and finally cardiovascular disease.

    Oxidative damage in DNA can cause cancer. Several antioxidant enzymes such as superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glutathione S-transferase etc. It has been proposed that polymorphisms in these enzymes are associated with DNA damage and subsequently the individual's risk of cancer susceptibility.

    A low calorie diet extends median and maximum lifespan in many animals. This effect may involve a reduction in oxidative stress. Antioxidants are used as food additives to help guard against food deterioration. Exposure to oxygen and sunlight are the two main factors in the oxidation of food, so food is preserved by keeping in the dark and sealing it in containers or even coating it in wax, as with cucumbers.

    However, as oxygen is also important for plant respiration , storing plant materials in anaerobic conditions produces unpleasant flavors and unappealing colors. Antioxidants are an especially important class of preservatives as, unlike bacterial or fungal spoilage, oxidation reactions still occur relatively rapidly in frozen or refrigerated food.

    The most common molecules attacked by oxidation are unsaturated fats; oxidation causes them to turn rancid. Thus, these foods are rarely preserved by drying; instead, they are preserved by smoking , salting or fermenting. Even less fatty foods such as fruits are sprayed with sulfurous antioxidants prior to air drying.

    Oxidation is often catalyzed by metals, which is why fats such as butter should never be wrapped in aluminium foil or kept in metal containers. Some fatty foods such as olive oil are partially protected from oxidation by their natural content of antioxidants, but remain sensitive to photooxidation.

    Antioxidants are frequently added to industrial products. A common use is as stabilizers in fuels and lubricants to prevent oxidation, and in gasolines to prevent the polymerization that leads to the formation of engine-fouling residues. Antioxidant polymer stabilizers are widely used to prevent the degradation of polymers such as rubbers, plastics and adhesives that causes a loss of strength and flexibility in these materials.

    They can be protected by antiozonants. Solid polymer products start to crack on exposed surfaces as the material degrades and the chains break. The mode of cracking varies between oxygen and ozone attack, the former causing a "crazy paving" effect, while ozone attack produces deeper cracks aligned at right angles to the tensile strain in the product.

    Oxidation and UV degradation are also frequently linked, mainly because UV radiation creates free radicals by bond breakage. The free radicals then react with oxygen to produce peroxy radicals which cause yet further damage, often in a chain reaction. Other polymers susceptible to oxidation include polypropylene and polyethylene. The former is more sensitive owing to the presence of secondary carbon atoms present in every repeat unit.

    Attack occurs at this point because the free radical formed is more stable than one formed on a primary carbon atom. Oxidation of polyethylene tends to occur at weak links in the chain, such as branch points in low-density polyethylene. Antioxidant vitamins are found in vegetables, fruits, eggs, legumes and nuts. Vitamins A, C, and E can be destroyed by long-term storage or prolonged cooking.

    Other antioxidants are not obtained from the diet, but instead are made in the body. For example, ubiquinol coenzyme Q is poorly absorbed from the gut and is made through the mevalonate pathway. As any glutathione in the gut is broken down to free cysteine, glycine and glutamic acid before being absorbed, even large oral intake has little effect on the concentration of glutathione in the body.

    Measurement of antioxidant content in food is not a straightforward process, as antioxidants collectively are a diverse group of compounds with different reactivities to various reactive oxygen species. In food science , the oxygen radical absorbance capacity ORAC was once an industry standard for estimating antioxidant strength of whole foods, juices and food additives, mainly from the presence of polyphenols. Alternative in vitro measurements of antioxidant content in foods — also based on the presence of polyphenols — include the Folin-Ciocalteu reagent , and the Trolox equivalent antioxidant capacity assay.

    As part of their adaptation from marine life, terrestrial plants began producing non-marine antioxidants such as ascorbic acid vitamin C , polyphenols and tocopherols. In the late 19th and early 20th centuries, extensive study concentrated on the use of antioxidants in important industrial processes, such as the prevention of metal corrosion , the vulcanization of rubber, and the polymerization of fuels in the fouling of internal combustion engines.

    Early research on the role of antioxidants in biology focused on their use in preventing the oxidation of unsaturated fats , which is the cause of rancidity.

    However, it was the identification of vitamins C and E as antioxidants that revolutionized the field and led to the realization of the importance of antioxidants in the biochemistry of living organisms.

    From Wikipedia, the free encyclopedia. A compound that inhibits the oxidation of other molecules. Pathology , Free-radical theory , and Oxidative stress. List of antioxidants in food and Polyphenol antioxidant. Ullmann's Encyclopedia of Industrial Chemistry. Retrieved 20 June The Cochrane Database of Systematic Reviews. Journal of General Internal Medicine.

    The Proceedings of the Nutrition Society. World Cancer Research Fund Retrieved 24 July CNS and Neurological Disorders. Plant Foods for Human Nutrition. Journal of Alzheimer's Disease.

    Oxidant—Antioxydant system: Role and significance in human body

    Oxidants can play useful or harmful roles in human health and industry. At their most basic level, oxidants remove electrons from other substances Scholar: Oxidant-antioxidant System: Role and Significance in Human Body. Present article gives a holistic view of the causes, role and conrol of oxidative stress in the development and progre - sion of various human diseases. Several . Your body also creates oxidants to help keep viruses at bay, but - like you from some of the medical conditions associated with free radicals.




    Oxidants can play useful or harmful roles in human health and industry. At their most basic level, oxidants remove electrons from other substances Scholar: Oxidant-antioxidant System: Role and Significance in Human Body.


    Present article gives a holistic view of the causes, role and conrol of oxidative stress in the development and progre - sion of various human diseases. Several .


    Your body also creates oxidants to help keep viruses at bay, but - like you from some of the medical conditions associated with free radicals.


    Antioxidants are compounds that inhibit oxidation. Oxidation is a chemical reaction that can . These compounds may be synthesized in the body or obtained from the diet. The different antioxidants are present at a wide range of concentrations.


    Oxidants and Antioxidants: What You Need to Know. ROS are produced in the body in day-to-day life ROS can be directl Read More. How is ROS produced.


    Request PDF on ResearchGate | Oxidant—Antioxydant system: Role and significance in human body | Present article gives a holistic view of the causes, role.


    Antioxidants are a critical part of the body's powerful defense system. For the most part, our antioxidant reserves can keep errant oxidation under control.

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