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Riboflavin - CFA Equipment manufacturer - TG40 Diaphragm Wall Equipment

Discovery
Fluorescent spectra of Riboflavin
Vitamin B was originally considered to have two components, a heat-labile vitamin B1 and a heat-stable vitamin B2 (1). In the 1920s, vitamin B2 was thought to be the factor necessary for preventing pellagra. In 1923, Paul Gyorgi in Heidelberg was investigating egg white injury in rats, the curative factor for this condition was called vitamin H. Since both pellagra and vitamin H deficiency were associated with dermatitis, Gyorgi decided to test the effect of vitamin B2 on vitamin H deficiency in rat. He enlisted the service of Wagner-Jauregg in Kuhn laboratory (1). In 1933, Kuhn, Gyorgy, and Wagner found that thiamin-free extracts of yeast, liver, or rice bran prevented the growth failure of rats fed a thiamin supplemented diet. Further, they noted that a yellow-green fluorescence in each extract promoted rat growth, and that the intensity of fluorescence was proportional to the effect on growth. This observation enabled them to develop a rapid chemical and bioassay to isolate the factor from egg white in 1933, they called it Ovoflavin. The same group then isolated the same preparation (a growth-promoting compound with yellow-green fluorescence) from whey using the same procedure (lactoflavin). In 1934 Kuhn group identified the structure of so-called flavin and synthesised vitamin B2 (1). Toxicity
Riboflavin is not toxic when taken orally, as its low solubility keeps it from being absorbed in dangerous amounts from the gut. Although toxic doses can be administered by injection, any excess at nutritionally relevant doses is excreted in the urine, imparting a bright yellow color when in large quantities. In humans, there is no evidence for riboflavin toxicity produced by excessive intakes. Even when 400 mg/d of riboflavin was given orally to subjects in one study for three months to investigate the efficacy of riboflavin in the prevention of migraine headache, no short-term side effects were reported. Industrial synthesis
Various biotechnological processes have been developed for industrial scale riboflavin biosynthesis using different microorganisms, including filamentous fungi such as Ashbya gossypii, Candida famata and Candida flaveri as well as the bacteria Corynebacterium ammoniagenes and Bacillus subtilis. The latter organism has been genetically modified to both increase the bacteria's production of riboflavin and to introduce an antibiotic (ampicillin) resistance marker, and is now successfully employed at a commercial scale to produce riboflavin for feed and food fortification purposes. The chemical company BASF has installed a plant in South Korea, which is specialized on riboflavin production using Ashbya gossypii. The concentrations of riboflavin in their modified strain are so high, that the mycelium has a reddish / brownish color and accumulates riboflavin crystals in the vacuoles, which will eventually burst the mycelium. Riboflavin in food: Occurrence, sources and stability
Riboflavin powder.
A riboflavin solution.
Riboflavin is yellow or yellow-orange in color and in addition to being used as a food coloring, it is also used to fortify some foods. It is used in baby foods, breakfast cereals, pastas, sauces, processed cheese, fruit drinks, vitamin-enriched milk products, and some energy drinks. Regarding occurrence and sources of vitamin B2, Yeast extract is considered to be exceptionally rich in vitamin B2, and liver and kidney are also rich sources. Wheat bran, eggs, meat, milk, and cheese are important sources in diets containing these foods. Cereals grains contain relatively low concentrations of flavins, but are important sources in those parts of the world where cereals constitute the staple diet. The milling of cereals results in considerable loss (up to 60%) of vitamin B2, so white flour is enriched in some countries such as USA by addition of the vitamin. The enrichment of bread and ready-to-eat breakfast cereals contributes significantly to the dietary supply of vitamin B2. Polished rice is not usually enriched, because the vitamin yellow color would make the rice visually unacceptable to the major rice-consumption populations. However, most of the flavins content of the whole brown rice is retained if the rice is steamed prior to milling. This process drives the flavins in the germ and aleurone layers into the endosperm. Free riboflavin is naturally present in foods along with protein-bound FMN and FAD. Bovine milk contains mainly free riboflavin, with a minor contribution from FMN and FAD. In whole milk, 14% of the flavins are bound noncovalently to specific proteins. Egg white and egg yolk contain specialized riboflavin-binding proteins, which are required for storage of free riboflavin in the egg for use by the developing embryo.
It is difficult to incorporate riboflavin into many liquid products because it has poor solubility in water. Hence the requirement for riboflavin-5'-phosphate (E101a), a more expensive but more soluble form of riboflavin.
Riboflavin is generally stable during the heat processing and normal cooking of foods if light is excluded. The alkaline conditions in which riboflavin is unstable are rarely encountered in foodstuffs. Riboflavin degradation in milk can occur slowly in dark during storage in the refrigerator. (7). Nutrition-Recommended Dietary Allowance (RDA) Recommended Dietary Allowance (RDA)
The latest (1998) RDA recommendation for vitamin B2 are similar to the 1989 RDA, which for adults, suggested a minimum intake of 1.2 mg for persons whose caloric intake may be > 2,000 Kcal. The current RDAs for Riboflavin for adult men and women are 1.3 mg/day and 1.1 mg/day, respectively; the estimated average requirement for adult men and women are 1.1 mg and 0.9 mg, respectively. Recommendations for daily riboflavin intake increase with pregnancy and lactation to 1.4 mg and 1.6 mg, respectively (1in advanced). For infants the RDA is 0.3-0.4 mg/day and for children it is 0.6-0.9 mg/day. Riboflavin deficiency
Further information: Ariboflavinosis
Riboflavin is continuously excreted in the urine of healthy individuals, making deficiency relatively common when dietary intake is insufficient. However, riboflavin deficiency is always accompanied by deficiency of other vitamins.
A deficiency of riboflavin can be primary - poor vitamin sources in one's daily diet - or secondary, which may be a result of conditions that affect absorption in the intestine, the body not being able to use the vitamin, or an increase in the excretion of the vitamin from the body.
In humans, signs and symptoms of riboflavin deficiency (ariboflavinosis) include cracked and red lips, inflammation of the lining of mouth and tongue, mouth ulcers, cracks at the corners of the mouth (angular cheilitis), and a sore throat. A deficiency may also cause dry and scaling skin, fluid in the mucous membranes, and iron-deficiency anemia. The eyes may also become bloodshot, itchy, watery and sensitive to bright light.
Riboflavin deficiency is classically associated with the oral-ocular-genital syndrome. Angular cheilitis, photophobia, and scrotal dermatitis are the classic remembered signs.
In animals, riboflavin deficiency results in lack of growth, failure to thrive, and eventual death. Experimental riboflavin deficiency in dogs results in growth failure, weakness, ataxia, and inability to stand. The animals collapse, become comatose, and die. During the deficiency state, dermatitis develops together with hair-loss. Other signs include corneal opacity, lenticular cataracts, hemorrhagic adrenals, fatty degeneration of the kidney and liver, and inflammation of the mucus membrane of the gastrointestinal tract. Post-mortem studies in rhesus monkeys fed a riboflavin-deficient diet revealed that about one-third the normal amount of riboflavin was present in the liver, which is the main storage organ for riboflavin in mammals. These overt clinical signs of riboflavin deficiency are rarely seen among inhabitants of the developed countries. However, about 28 million Americans exhibit a common ub-clinical stage. characterized by a change in biochemical indices (e.g. reduced plasma erythrocyte glutathione reductase levels). Although the effects of long-term sub-clinical riboflavin deficiency are unknown, in children this deficiency results in reduced growth. Subclinical riboflavin deficiency has also been observed in women taking oral contraceptives, in the elderly, in people with eating disorders, and in disease states such as HIV, inflammatory bowel disease, diabetes and chronic heart disease. The fact that riboflavin deficiency does not immediately lead to gross clinical manifestations indicates that the systemic levels of this essential vitamin are tightly regulated. Assessment of Riboflavin Status
Biochemical tests are essential for confirming clinical cases of riboflavin deficiency and for establishing subclinical deficiencies. Among these tests:
Erythrocyte glutathione reductase activity:
Glutathione reductase is a nicotinamide adenine dinucleotide phosphate (NADPH), a FAD-dependent enzyme, and the major flavoproteins in erythrocyte. The measurement of the activity coefficient of erythrocyte glutathione reductase (EGR) is the preferred method for assessing riboflavin status. It provides a measure of tissue saturation and long-term riboflavin status. In vitro enzyme activity in terms of activity coefficients (AC) is determined both with and without the addition of FAD to the medium. ACs represent a ratio of the enzyme activity with FAD to the enzyme activity without FAD. An AC of 1.2 to 1.4, riboflavin status is considered low when FAD is added to stimulate enzyme activity. An AC > 1.4 suggests riboflavin deficiency. On the other hand, if FAD is added and AC is < 1.2, then riboflavin status is considered acceptable. Tillotson and Baker (1972) reported that a decrease in the intakes of riboflavin was associated with increase in EGR AC. in the U.K. study of Norwich elderly (Bailey et al., 1997), initial EGR AC values for both males and females were significantly correlated with those measured 2 years later, suggesting that EGR AC may be a reliable measure of long-term biochemical riboflavin status of individuals. These findings are consistent with earlier studies (Rutishauser et al., 1979).
Urinary riboflavin excretion:
Experimental balance studies indicate that urinary riboflavin excretion rates increase slowly with increasing intakes, until intake level approach 1.0 mg/d, when tissue saturation occurs. At higher intakes, the rate of excretion increases dramatically. Once intakes of 2.5 mg/d are reached, excretion becomes approximately equal to the rate of absorption (Horwitt et al., 1950)(18). At such high intake a significant proportion of the riboflavin intake is not absorbed.If urinary riboflavin excretion is <19 g/g creatinine (without recent riboflavin intake) or < 40 g per day are indicative of deficiency. Function
FMN and FAD function as coenzymes for a wide variety of oxidative enzymes and remain bound to the enzymes during the oxidation-reduction reactions. Flavins can act as oxidizing agents because of their ability to accept a pair of hydrogen atoms. Reduction of isoalloxazine ring (FAD, FMN oxidized form) yields the reduced forms of the flavoproteins (FMNH2 and FADH2). Mechanism of Action
Flavoproteins exhibit a wide range of redox potential and therefore can play a wide variety of roles in intermediary metabolism (5). Some of these roles are:
Flavoproteins play very important roles in the electron transport chain(5)
Decarboxylation of pyruvate and -Ketoglutarate requires FAD()
Fatty acyl CoA dehydrogenase requires FAD in fatty acid oxidation (5)
FAD is required to the production of pyridoxic acid from pyridoxal (vitamin B6)
The primary coenzyme form of vitamin B6 (Pyridoxal phosphate) is FMN dependent(5)
FAD is required to convert retinal (Vitamin A) to retinoic acid
Synthesis of an active form of folate (5-methyl THF) is FADH2 dependent
FAD is required to convert tryptophan to niacin (vitamin B3)
Reduction of the oxidized form of glutathione (GSSG) to its reduced form (GSH) is also FAD dependent (5) Clinical uses
Riboflavin has been used in several clinical and therapeutic situations. For over 30 years, riboflavin supplements have been used as part of the phototherapy treatment of neonatal jaundice. The light used to irradiate the infants breaks down not only the toxin causing the jaundice, but the naturally occurring riboflavin within the infant's blood as well.
More recently there has been growing evidence that supplemental riboflavin may be a useful additive along with beta-blockers in the prevention of migraine headaches.
Development is underway to use riboflavin to improve the safety of transfused blood by reducing pathogens found in collected blood. Riboflavin attaches itself to the nucleic acids (DNA and RNA) in cells, and when light is applied, the nucleic acids are broken, effectively killing those cells. The technology has been shown to be effective for inactivating pathogens in all three major blood components: (platelets, red blood cells, and plasma). It has been shown to inactivate a broad spectrum of pathogens, including known and emerging viruses, bacteria, and parasites.
Recently riboflavin has been used in a new treatment to slow or stop the progression of the corneal disorder keratoconus. This is called corneal collagen crosslinking (CXL). In corneal crosslinking, riboflavin drops are applied to the patient corneal surface. Once the riboflavin has penetrated through the cornea, Ultraviolet A light therapy is applied. This induces collagen crosslinking, which increases the tensile strength of the cornea. The treatment has been shown in several studies to stabilize keratoconus. Industrial Uses
Because riboflavin is fluorescent under UV light, dilute solutions (0.015-0.025% w/w) are often used to detect leaks or to demonstrate coverage in an industrial system such a chemical blend tank or bioreactor. (See the ASME BPE section on Testing and Inspection for additional details.) Good sources
Riboflavin is found naturally in asparagus, bananas, persimmons, okra, chard, cottage cheese, milk, yogurt, meat, eggs, fish, and green beans (particularly on the ends), each of which contain at least 0.1 mg of the vitamin per 310.5 oz (85300 g) serving.(5). Riboflavin is destroyed by exposure to ultraviolet light, so milk sold in transparent (glass/plastic) bottles will likely contain less riboflavin than milk sold in opaque containers. See also
Ariboflavinosis (riboflavin deficiency)
Flavin
Riboflavin synthase
Riboflavin kinase References
^ "Current EU approved additives and their E Numbers". UK Food Standards Agency. July 27, 2007. http://www.food.gov.uk/safereating/chemsafe/additivesbranch/enumberlist. Retrieved December 3, 2009. 
^ a b c Brody, Tom (1999). Nutritional Biochemistry. San Diego: Academic Press. ISBN 0-12-134836-9. OCLC 162571066 212425693 39699995 51091036. 
^ Higdon, Jane; Victoria J. Drake (2007). "Riboflavin". Micronutrient Information Center. Linus Pauling Institute at Oregon State University. http://lpi.oregonstate.edu/infocenter/vitamins/riboflavin/. Retrieved December 3, 2009. 
^ a b Unna, Klaus and Greslin, Joseph G. (1942). "Studies on the toxicity and pharmacology of riboflavin". J Pharmacol Exp Ther 76 (1): 7580. 
^ Zempleni, 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): 5466. PMID 8604671. 
^ Boehnke C., Reuter U., Flach U., and et al., High-dose riboflavin treatment is efficacious in migraine prophylaxis: an open study in a tertiary care centre 2004 Jul;11(7):475-7
^ Gropper S.S., Smith J.L., and Groff J.L., Riboflavin, Chapter 9, in Advanced Nutrition and Human Metabolism, 5th ed. Wadsworth CENGAG Learning, 2009, P329-333
^ Stahmann KP, Revuelta JL and Seulberger H. (2000). "Three biotechnical processes using Ashbya gossypii, Candida famata, or Bacillus subtilis compete with chemical riboflavin production". Appl Microbiol Biotechnol 53 (5): 509516. doi:10.1007/s002530051649. 
^ Food Standards Agency, McCance and Widdowson The Composition of Foods, 6th summary ed, Royal Society of Chemistry, Cambridge, 2002
^ Ball F.M. George, Riboflavin in Vitamins in Foods, Analysis, Bioavailability, and Stability. Taylor and Francis Group, New York, 2006. P168-175
^ Ball F.M. George, Riboflavin in Vitamins in Foods, Analysis, Bioavailability, and Stability. Taylor and Francis Group, New York, 2006. P168-175
^ Kanno, C., Kanehara, N., Shirafuji, K., and et al. Binding Form of Vitamin B2 in Bovine Milk: its concentration, distribution, and binding linkage, J. Nutr. Sci. Vitaminol., 37, 15, 1991
^ Faron G, Drouin R, Pedneault L, et al. Recurrent cleft lip and palate in siblings of a patient with malabsorption syndrome, probably caused by hypovitaminosis A associated with folic acid and riboflavin deficiencies. Teratology 2001;63:1613
^ National Research Council. RDAs, 10th ed. Washington, DC: National Academy Press, 1989, PP.132-37
^ Gropper S.S., Smith J.L., and Groff J.L., Riboflavin, Chapter 9, in Advanced Nutrition and Human Metabolism, 5th ed. Wadsworth CENGAG Learning, 2009, P329-333
^ Powers J. Hilary. Riboflavin (vitamin B-2) and health, Review Article. Am J Clin Nutr 2003;77:135260
^ 10. Gibson S. Rosalind, Riboflavin in Principles of Nutritional Assessment, 2nd ed. OXFORD university press, 2005
^ Gropper S.S., Smith J.L., and Groff J.L., Riboflavin, Chapter 9, in Advanced Nutrition and Human Metabolism, 5th ed. Wadsworth CENGAG Learning, 2009, P329-333
^ Tilloston JA, Bashor EM. An enzymatic measurement of the riboflavin status in man. American J. Of Clin. Nutr., 1972; 72:251-261
^ Rutishauser IHE, Bates CJ, Paul AA, and et al. Long term vitamin status and dietary intake of health elderly subjects. I. Riboflavin. British J. of Nutr. , 1979; 42:33-42
^ Gibson S. Rosalind, Riboflavin in Principles of Nutritional Assessment, 2nd ed. OXFORD university press, 2005.
^ Sndor PS, Afra J, Ambrosini A, Schoenen J. Prophylactic treatment of migraine with beta-blockers and riboflavin: differential effects on the intensity dependence of auditory evoked cortical potentials. Headache. 2000 Jan;40(1):30-5. External links
Jane Higdon, "Riboflavin", Micronutrient Information Center, Linus Pauling Institute
Mirasol PRT includes a brief description of riboflavin as an agent to inactivate pathogens.
v  d  e
Vitamins (A11)
Fat soluble
A
Retinol  -Carotene  Tretinoin  -Carotene
D
D2 (Ergosterol, Ergocalciferol)   D3 (7-Dehydrocholesterol, Previtamin D3, Cholecalciferol, 25-hydroxycholecalciferol, Calcitriol (1,25-dihydroxycholecalciferol), Calcitroic acid)
D4 (Dihydroergocalciferol)   D5   D analogues (Dihydrotachysterol, Calcipotriol, Tacalcitol, Paricalcitol)
E
Tocopherol (Alpha, Beta, Gamma, Delta)  Tocotrienol  Tocofersolan
K
Naphthoquinone  Phylloquinone/K1  Menatetrenone/K2  Menadione/K3
Water soluble
B
B1 (Thiamine)  B2 (Riboflavin)  B3 (Niacin, Nicotinamide)  B5 (Pantothenic acid, Dexpanthenol, Pantethine)  B6 (Pyridoxine, Pyridoxal phosphate, Pyridoxamine)
B7 (Biotin)  B9 (Folic acid, Dihydrofolic acid, Folinic acid)  B12 (Cyanocobalamin, Hydroxocobalamin, Methylcobalamin, Cobamamide)   Choline
C
Ascorbic acid   Dehydroascorbic acid
see also: enzyme cofactors, enzymes, Multivitamins Categories: Flavins | Vitamins | Coenzymes
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