been Découvertespectres riboflavineLa fluorescent vitamin B has two components, a heat labile vitamin B1 and vitamin B2 stable to heat (1) views. In the 1920s, the vitamin B2 has been thought to require a factor, prevent pellagra. In 1923 Paul was in Heidelberg Gyorgi verification of protein injury in rats, the healing factor of this disease has been called Vitamin H. For two pellagra and vitamin H were associated with dermatitis, decided Gyorgi the effect of vitamin B2 deficiency in Vitamin H To test rats. He entered the service of the Wagner-Jauregg in the laboratory of Kuhn (1). In 1933, Kuhn, Gyorgy, and Wagner, that extracts of thiamine without yeast, liver and rice bran prevents the growth retardation in rats fed a diet rich in thiamin. They also found that yellow-green fluorescence to extract promote growth in each of the rat, and the intensity of fluorescence is proportional to the impact on growth. This observation allowed them to rapid chemical and biological tests to develop the factor of protein isolated in 1933, they called Ovoflavin. The same group subsequently isolated the same compound (a compound that promotes the growth with a fluorescent yellow-green) from whey by the same procedure (Lactoflavin). In 1934, the group determined the structure of the flavin Kuhn himself and the synthesis of vitamin B2 (1). ToxicitéLa Riboflavin is not toxic orally, because of the low solubility prevents them absorbed in dangerous amounts in the gut. Although toxic doses can be administered by injection, an excess of nutritionally relevant doses is excreted in the urine, imparting a bright yellow, when large quantities. In humans, there are no signs of toxicity produced by excessive intake of riboflavin. Even if 400 mg of riboflavin was administered orally to subjects in a study of three months, the efficacy in the prevention of riboflavin migraine study, no short-term side effects were reported. Synthesis industrielleDivers biotechnological methods have been developed for the biosynthesis of riboflavin on an industrial scale with the help of various microorganisms, including filamentous fungi such as Ashbya gossypii, Candida famata and Candida flaveri and the bacteria Corynebacterium ammoniagenes and Bacillus subtilis. The latter body has been genetically modified both increase production of bacterial riboflavin and introduced an antibiotic (ampicillin) resistance marker and is now successfully used on a commercial scale to produce riboflavin for feed and food fortification. Chemicals group BASF has a plant in South Korea which is specialized in the production, installed with Ashbya gossypii riboflavin. The concentrations of riboflavin in their modified strain are so high that the mycelium has a red / brown color and accumulates riboflavin crystals in the vacuoles, which eventually burst the mycelium. Riboflavin in food: occurrence, sources, and the stabilitépoudre riboflavine.Une riboflavine.La riboflavin solution is yellow or yellow-orange in color and in addition to use as a food dye used, it is also used to reinforce some food. It is in baby foods, cereals, pasta, sauces, cheese, fruit juices, dairy products, the use of vitamins and energy drinks. In terms of accident and sources of vitamin B2, yeast extract is regarded as particularly rich in vitamin B2 and liver and kidney are also rich sources. Wheat bran, eggs, meat, milk and cheese are important sources in the diet with these foods. Cereal grains contain relatively low concentrations of flavins, but are important sources in these regions of the world where cereals are the staple food. The flour is enriched with a significant loss (60%) of vitamin B2, when white flour in some countries like the United States by the addition of vitamin. The enrichment of bread and ready-to-eat breakfast cereals contribute significantly to the food supply of vitamin B2. Polished rice is generally not enriched, because the yellow color would make the vitamin rice visually unacceptable to the major populations of rice for consumption. However, the substance most flavins whole brown rice is to be retained when the rice is steamed before grinding. This process involves the flavins in the germ and aleurone layers in the endosperm. free riboflavin is a natural component of foods with protein-bound FMN and FAD. Cow’s milk contains mainly free riboflavin, with a small contribution of FMN and FAD. In whole milk, 14% of the flavins are covalently bound to specific proteins. Egg white and egg yolk contains specific proteins binding riboflavin, which are needed for the storage of free riboflavin in the egg for use by the developing embryo. It is difficult to incorporate riboflavin into many liquid products because they are poor solubility in water. Hence the need for riboflavin 5′-phosphate (E101a), a more expensive, but soluble form of riboflavin riboflavine.La is generally stable during the heat treatment and normal cooking of food, when the light is excluded. Alkaline conditions in which riboflavin is unstable are rarely found in foods. Degradation of riboflavin can occur in the milk slowly in the dark during storage refrigerator. (7). Nutrition Recommended Dietary Allowance (RDA) Recommended Dietary Allowance (RDA) The latest (1998 recommended) RDA for vitamin B2 are similar to the GDR in 1989, for adults, points to a minimum intake of 1.2 mg for people whose energy intake to> 2,000 kcal. The current RDA for riboflavin for adults men and women are 1.3 mg / day and 1.1 mg / day, respectively, the estimated needs for the average male and female adults, 1.1 mg and 0.9 mg. Recommendations for increasing the daily dose of riboflavin during pregnancy and lactation to 1.4 mg and 1.6 mg and (1 inch advanced). For infants in the GDR is 0.3 to 0.4 mg / day and for children is 0.6 to 0.9 mg / day. Lack riboflavinePour More information: ariboflavinoseLa Riboflavin is continuously excreted in the urine of healthy persons, which quite often lack, if food is insufficient. However, riboflavin deficiency is always accompanied by a lack of other primary vitamines.Une riboflavin deficiency – poor sources of vitamin in the diet – or secondary, a result of conditions that absorption may be impaired in the intestine, the body is not in the Location, vitamin, use or increased excretion of vitamin corps.Chez people, signs and symptoms of riboflavin deficiency (ariboflavinosis) cracked and red lips, inflammation of the mouth and tongue, mouth ulcers, cracks at the corner of the mouth (angular cheilitis ), and neck pain. A deficiency can also cause dry, scaly, fluid on the mucous membranes and iron deficiency anemia. The eyes can also bloodshot, itchy, watery and sensitive to become lumière.carence riboflavin is classic with an oro-genital associated oculomotor nerve. Angular cheilitis, photophobia, and eczema of the scrotum are the classic signs of rappeler.Chez animals, results of riboflavin deficiency in the absence of growth, stunting and eventual death. stand the results of riboflavin deficiency in dogs in experimental growth retardation, weakness, ataxia and inability. The collapse of the animals in a coma and die. While the government deficit, dermatitis developed with the loss of hair. Other signs include corneal opacity, lenticular cataracts, hemorrhagic adrenals, fatty degeneration of the liver and kidneys, and inflammation of the mucous membranes of the digestive tract. post-mortem studies in rhesus monkeys fed a riboflavin-deficient diet showed that about one third the normal amount of riboflavin in the liver, the principal organ for the storage of riboflavin in mammals. These obvious clinical signs of riboflavin deficiency is rare among the inhabitants of industrialized countries. However, about 28 million Americans a joint UB-clinical stage. characterized by a change in biochemical indices (for example, reduced the plasma levels of erythrocyte glutathione reductase). Although the effects of riboflavin deficiency are unknown in long-term subclinical, leading to deficiency in children of reduced growth. Subclinical riboflavin deficiency has also been observed in women taking oral contraceptives, the elderly, people with eating disorders and diseases such as HIV, inflammatory bowel disease, diabetes and chronic heart disease. The fact that riboflavin deficiency is not immediately lead to serious clinical symptoms, show that systemic concentrations of these are essential vitamin tightly regulated. Evaluation of riboflavin stateThe biochemical tests are necessary to confirm clinical cases of riboflavin deficiency and subclinical deficiencies. These tests: the activity of erythrocyte glutathione reductase: glutathione reductase is a Nicotinamide adenine dinucleotide phosphate (NADPH), FAD-dependent enzyme, and the most important flavoproteins in erythrocytes. The extent of the activity coefficient of erythrocyte glutathione reductase (EGR) is the preferred method to assess the state of riboflavin. It is a measure of tissue saturation and the state of riboflavin provides long-term. In vitro enzymatic activity in the form of activity coefficients (AC) is determined, both with and without addition of FAD to the average. CA provides a ratio of activity of the enzyme with FAD on the enzyme activity without FAD. A turnover of 1.2 to 1.4, the state of riboflavin is low when FAD is added to stimulate the enzyme activity considered. A C> 1.4 suggests a lack of riboflavin. On the other hand, when FAD is added and CA is <1.2, then the status of riboflavin is considered acceptable. Tillotson and Baker (1972) reported that reducing the intake of riboflavin associated with elevated CA PMA. Study in the United Kingdom Norwich elderly (Bailey et al., 1997), the initial CA EGR for men and women were significantly correlated with the measured two years later, suggesting that AC EGR a reliable measure of the long-term biochemical riboflavin status of the individual. These results are consistent with previous studies (Rutishauser et al., 1979). Riboflavin urine: Experimental studies indicate that increases the balance of renal excretion of riboflavin slowly with increasing flow up review that the approach of 1.0 mg / d, when the saturation of the tissues. At higher levels of intake, the rate of excretion dramatically. When the recording of 2.5 mg / day is reached, the excretion is approximately equal to the rate of absorption (Horwitt et al., 1950) (18). At high intake of such a large proportion of the intake of riboflavin is not absorbed.If urinary excretion of riboflavin is <19 g / g creatinine (without addition of riboflavin recent) or <40 g per day for signs of weakness. FonctionFMN and function as coenzymes for numerous enzymes and oxidative enzymes remain bound FAD during the oxidation-reduction. Flavius may as oxidants for their ability to act to accept a pair of hydrogen atoms. Break the ring isoalloxazine (FAD, FMN oxidized form), we obtain the reduced forms of flavoproteins (FMNH2 and FADH2). Mechanism actionFlavoprotéines have a wide range of redox potentials and are therefore a variety of roles in intermediary metabolism (5). are some of these roles: Flavoproteins play an important role in the electron transport chain (5) decarboxylation of pyruvate and-ketoglutarate requires FAD () acyl-CoA dehydrogenase requires FAD oxidation of fatty acids (5) FAD is necessary for acid production pyridoxic pyridoxal ( vitamin B6), the primary form of vitamin B6 coenzyme (pyridoxal phosphate) is dependent FMN (5) FAD is necessary to retinal (vitamin A) acid rétinoïqueSynthèse convert d an active form of folic acid (5-methyl-THF) to FADH2 is chargeFAD is necessary to convert tryptophan into niacin (vitamin B3) reduction of oxidized glutathione (GSSG) to its reduced form (GSH) is also dependent on FAD (5) Does cliniquesLa riboflavin was in many clinical situations and therapeutic use. For over 30 years of riboflavin supplements in the treatment of phototherapy for neonatal jaundice have used. The light used to irradiate the infants not only breaks the toxin that causes jaundice, but riboflavin in the blood of children naturally ainsi.Plus recently, it was increasingly clear that the additional riboflavin may be a useful additive with beta-blockers to prevent migraines.Le development is underway to use the riboflavin to ensure the safety of blood transfusion by reducing the pathogens in blood collected Enhance. Riboflavin binds to nucleic acids (DNA and RNA) in cells broken, and if the light is applied, the nucleic acids, the killing of the cells. The technology has been shown that the inactivation of pathogens in all three major blood components (platelets, red blood cells and plasma) effect. It has been shown that a broad spectrum of pathogens, including known and unknown viruses, bacteria and parasites.riboflavine has been used recently in a new treatment to slow or stop the progression of keratoconus corneal disorder inactivated. This is called corneal collagen cross-linking (CXL). Through the network of the cornea, riboflavin drops applied to the cornea of the patient. As soon as riboflavin has through the cornea, a UV-light therapy is applied penetrated. This induces the crosslinking of collagen, which increases the strength of the cornea. The treatment was, in several studies have shown that to stabilize the keratoconus. Use industriellesParce that riboflavin is fluorescent under UV light, diluted solutions (w 0.015 to 0.025% w / w) are often used to detect leaks or display cover in an industrial plant as a chemical mixing tank or bioreactor. (See ASME BPE test and inspection reports for details.) Good sourcesLa Riboflavin is found naturally in asparagus, bananas, persimmons, beans, okra, chard cheese, milk, yogurt, meat, eggs, fish, and green (especially at the ends ), each of which contains at least 0.1 mg vitamin per 310.5 oz (85 300 g) serving. (5). Riboflavin is destroyed by irradiation with ultraviolet light, then the milk in transparent (glass / plastic bottles) are likely to contain less riboflavin than milk sold in opaque containers. See aussiAriboflavinose (riboflavin deficiency) Flavinsynthase kinase riboflavineRiboflavine References ^ “Current EU approved additives and E numbers. Food Standards Agency in Britain. 27 July 2007. Http://www.food.gov.uk/safereating/chemsafe/additivesbranch / enumberlist. Retrieved 3 December 2009. ↑ abc Brody, Tom (1999). Biochemistry of Nutrition. San Diego: Academic Press. ISBN 0-12-134836-9. 162 571 066 212 425 693 39699995 OCLC 51091036.Higdon ^, Jane, Victoria J . Drake (2007). “riboflavin. Information for micronutrients. Linus Pauling Institute at the University of Oregon. Http: / / lpi.oregonstate.edu / Info Center / Vitamins / Riboflavin /. Accessed 3rd December 2009. ↑ from Unna, Klaus and Greslin, Joseph G. (1942). “Studies on the toxicity and pharmacology of riboflavin. J Pharmacol Exp There 76 (1): 7580.Zempléni ^ J and Galloway, JR and McCormick, DB (1996).” Pharmacokinetics of orally and intravenously administered riboflavin in healthy humans. Am J Clin Nutr (The American Society for Nutrition) 63 (1): 5466th PMID 8604671st ^ C. Boehnke, Reuter U, Flach U, et al. The high-dose riboflavin treatment is effective in the prophylaxis of migraine: an open study in a tertiary care center in July 2004, 11 (7) :475-7SS ^ Gropper, JL Smith and JL Groff, riboflavin, Chapter 9, Advanced Nutrition and human metabolism, 5th Ed. Cengage Wadsworth, 2009, P329-333KP ^ Stahmann, JL Revuelta and Seulberger H. (2000). “Three of biotechnological processes using Ashbya gossypii, Candida famata, or Bacillus subtilis compete with chemical riboflavin production. Appl Microbiol Biotechnol 53 (5): 509 516th DOI: 10.1007/s002530051649. ^ Food Standards Agency, McCance and Widdowson food composition, 6 . ed summary, Royal Society of Chemistry, Cambridge, 2002Ball ^ George FM, riboflavin vitamins in food analysis, bioavailability and stability. Taylor and Francis Group, New York, 2006. P168-FM 175Ball ^ George, riboflavin vitamins in food analysis, bioavailability and stability. Taylor and Francis Group, New York, 2006. P168-175 ^ Kanno, C. Kanehara, N., Shirafuji, K., et al. Binding form of vitamin B2 in bovine milk: concentration, distribution, and the binding link , J. Nutr. Sci. Vitaminol., 37, 15, 1991G ^ Faron, Drouin R, Pedneault L, et al. Recurrent lip and cleft palate in siblings of a patient with malabsorption syndrome, probably caused by hypovitaminosis A with folic acid and riboflavin deficiencies related causes. Teratology 2001; 63:1613 ^ National Research Council. DDR, 10th Ed. Washington, DC: National Academy Press, 1989, PP.132-37SS ^ Gropper, JL Smith and JL Groff, riboflavin, Chapter 9, Advanced nutrition and human metabolism, 5th ed. Cengage Wadsworth, 2009, P329-333Puissances ^ J. Hilary. riboflavin (vitamin B-2) and health review, articles. Am J Clin Nutr 2003; 77:135260 ^ 10 S . Rosalind Gibson, riboflavin in the principles of nutritional assessment, 2nd ed. Oxford University Press, 2005SS ^ Gropper, JL Smith and JL Groff, riboflavin, Chapter 9, Advanced nutrition and human metabolism, 5th ed. Cengage Wadsworth Learning, 2009, P329-333JA Tilloston ^ EM Bashore. An enzymatic measurement of riboflavin status in humans. American J. Clin. Nutr., Bates 1972; 72:251 ^ 261IHE Rutishauser, CJ, Paul AA, et al. the status the long-term vitamin and dietary intake of healthy elderly subjects. I. Riboflavin. British J. Nutr., 1979; 42:33-42 ^ Rosalind S. Gibson, riboflavin in the principles of nutritional assessment, 2nd ed. Oxford University Press, 2005. Sndor ^ PS, Afra J, Ambrosini A, Schoenen J. Prophylaxis of migraine with beta-blockers and riboflavin: different effects on the intensity dependence of auditory evoked cortical potentials. Headache. 2000 Jan; 40 (1): 30-5. externesHigdon Links Jane “riboflavin”, Information Centre for micronutrients PRT contains Linus Institute PaulingMirasol a short description of riboflavin as an agent for inactivating agents pathogènes.v, d, eVitamines (A11) LiposolublesUneRétinol-carotene tretinoin carotèneDD2 (ergosterol, ergocalciferol) D3 (7-dehydrocholesterol, provitamin D3, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), the acid Calcitroic) D4 (Dihydroergocalciferol) D5 D analogues (dihydrotachysterol, calcipotriol, Tacalcitol, paricalcitol) ETocophérol (Alpha, Beta , Gamma, Delta) Tocofersolan TocotrienolKNaphtoquinone Phylloquinone/K1 Menatetrenone/K2 Menadione/K3Solubles in eauBB1 (thiamine), B2 (riboflavin), B3 (niacin, nicotinamide), B5 (pantothenic acid, Pantethine Dexpanthenol) B6 (pyridoxine, pyridoxal phosphate, pyridoxamine) B7 (biotin), B9 (folic acid, dihydrofolic, folinic acid), B12 (cyanocobalamin, hydroxocobalamin, methylcobalamin, Cobamamide) ascorbic acid CholineCL’acide déhydroascorbiquevoir also enzyme cofactors, enzymes, multivitamins categories: Flavius | Vitamins | Coenzymes
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