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Wikipedia Thiamine Definition PDF Print E-mail
Written by Bean   

The Following is an excerpt from Wikipedia about Thiamin, Thiamine, Vitamin B1

Thiamine or thiamin or vitamin B1 (pronounced /ˈθaɪ̯əmɨn/, THYE-ə-min), and named as the "thio-vitamine" ("sulfur-containing vitamin") is a water-soluble vitamin of the B complex. First named aneurin for the detrimental neurological effects of its lack in the diet, it was eventually assigned the generic descriptor name vitamin B1. Its phosphate derivatives are involved in many cellular processes. The best characterized form is thiamine pyrophosphate (TPP), a coenzyme in the catabolism of sugars and amino acids. In yeast, ThDP is also required in the first step of alcoholic fermentation.

All living organisms use thiamine in their biochemistry, but it is synthesized in bacteria, fungi and plants. Animals must obtain it from their diet, and thus for them it is a vitamin. Insufficient intake in birds produces a characteristic polyneuritis, and in mammals results in a disease called beriberi affecting the peripheral nervous system (polyneuritis) and/or the cardiovascular system, with fatal outcome if not cured by thiamine administration.[1] In less severe deficiency, nonspecific signs include malaise, weight loss, irritability and confusion.[2] Today, there is still much work devoted to elucidating the exact mechanisms by which thiamine deficiency leads to the specific symptoms observed (see below). New thiamine phosphate derivatives have recently been discovered,[3] emphasizing the complexity of thiamine metabolism and the need for more research in the field.

A careful research of our ThiaminVitamin.com web site will discuss various aspects of the above Thiamine information.

 
Thiamine's Mood-Mending Qualities PDF Print E-mail
Written by Richard N. Podell, M.D.   

Here Is an Interesting Article that is topical, relevant and speaks about results of good nutrition. Thank You Dr. Podell.

From The January 1999 Issue of Nutrition Science News

Doctor's Insight

Thiamine's Mood-Mending Qualities

Thiamine, also known as vitamin B1, is essential for the citric acid function known as the Krebs cycle—the primary biochemical path by which useful energy is extracted from glucose, amino acids and fats. The RDA of 1.1 to 1.5 mg a day provides enough thiamine to prevent beriberi, a potentially deadly deficiency disease, but is it enough to optimize biochemical function or to maximize a person's subjective well-being? How many people would feel better if they took more? Does medical science have the testing skills to tell who needs how much?Thiamin Vitamin B1 Mood Enhancement

Researchers from the department of psychology at the University of Wales in Swansea, together with the Basel, Switzerland-based Hoffman-LaRoche pharmaceutical company, recently put these questions to the test. One hundred twenty healthy female college students were given either 50 mg thiamine, considered a high dose, or a placebo. At the beginning of the study all but one volunteer had normal thiamine levels as measured by the standard erythrocyte transketolase test.

Despite their ostensibly normal nutritional status, after two months the students who took extra thiamine more than doubled their scores on the clear-headedness and mood subclasses of the bipolar Profile of Mood States (POMS) psychological test. Students treated with placebo showed no change. Those taking thiamine also increased their quickness on a reaction-time test. Again, the placebo group was unchanged. Finally, improvement also occurred on POMS subscales that measured if a participant felt confident, composed or elated. However, these latter results were not statistically significant.1

The same group of researchers had previously demonstrated the benefit of thiamine supplementation in people with subtle, borderline or subclinical thiamine deficiency.2,3 The current work with healthy college students augments earlier research by showing that young women with normal thiamine levels can benefit from megadose supplements.

I was disappointed that the authors did not cite the pioneering research of Derrick Lonsdale, M.D., and Raymond J. Shamberger, Ph.D., formerly of the Cleveland Clinic in Ohio. Lonsdale and Shamberger identified 20 patients with neuroticlike symptoms. Eight had biochemical evidence of thiamine deficiency; 12 did not. However, all improved substantially after an open trial of thiamine supplements plus a diet that restricted refined sugar.4

Most nutrition-oriented physicians in the United States would argue that improving one's overall diet is as important as supplementing with thiamine—and with good reason. Biochemically, the more calories consumed, especially carbohydrates, the more thiamine is required for the Krebs cycle to process the food into energy.

Other research emphasizes the importance of vitamin B1:

  • In one double-blind Israeli study, researchers gave intravenous thiamine or placebo for one week to 30 patients who were being treated for congestive heart failure. Echocardiography showed greater contraction power and increased urine excretion in the thiamine group.5
  • A New Zealand study found that 15 percent of a large group of randomly selected older people had thiamine deficiency as measured by the transketolase test. Their subjective quality of life scores and blood pressure improved after taking thiamine. Extra thiamine had no effect on those with normal transketolase.6
  • A 1957 study found that thiamine deficiency was associated with increased hypochondriasis, depression and hysteria scores on the Minnesota Multiphasic Personality Inventory test (MMPI).7

 

The bottom line is that vitamin supplements, such as thiamine, are beginning to prove their value—even for people whose nutritional status is considered normal. This way of thinking is a departure from the traditional disease-focused medical model, which assumes nutritional shortfalls aren't relevant until they become severe enough to cause illness. The traditional model assumes adding more nutrients adds nothing to the body's chemistry or function. From this perspective, the level of thiamine intake that's good enough for one should be good for all.

But the holistic model is pushing doctors, nutritionists and patients to rethink this approach to health. More people than ever are considering the relevance of biochemical individuality and enzyme enhancement with nutritional cofactors.

It is easy to see the progress made. Who would have thought even 10 years ago that physicians would be recommending greater than RDA doses of folic acid to pregnant women or that the government would be adding folic acid to our food supply? This is surely a tribute to how far we've come.

Dr Podell Thiamine Mood Enhancement

Richard N. Podell, M.D., is director of the Podell Medical Center in New Providence, N.J.

References

1. Benton D. Thiamine supplementation improves mood and cognitive functioning. Psychopharmacology 1997;129:66-71.

2. Benton D, et al. Vitamin supplementation for one year improves mood. Europsychobiology 1995;32:98-105.

3. Benton D, et al. The impact of long-term vitamin supplementation on cognitive function. Psychopharmacology 1995;117:298-305.

4. Lonsdale D, Shamberger R. Red cell transketolase as an indicator of nutritional deficiency. Am J Clin Nutr 1980;33:205-11.

5. Shimon I, et al. Improved left ventricular function after thiamine supplementation in patients with congestive heart failure receiving long-term furosemide therapy. Am J Med 1995;98:485.

6. Wilkinson T, et al. The response to treatment of subclinical thiamine deficiency in the elderly. Am J Clin Nutr 1997;66:925-8.

7. Brozek J. Psychological effects of thiamine restriction and deprivation in normal young men. Am J Clin Nutr 1957;5:109-18.

 
Vitamin B1 PDF Print E-mail
Written by Bean   

Thiamine Vitamin B1 For Growth, Energy and Caloric Intake

Lose Weight With Thiamine

Many men and women who are trying to lose weight turn to Vitamin B1 supplements. This vitamin is known to increase energy levels and speed up metabolism. It helps the body turn carbohydrates into energy. Vitamin B1 is also necessary for cells, the heart, and the brain to function properly. Vitamin B1 is also known as Thiamine or Thiamin. There are 8 distinct types of vitamins in the B category, explaining why each has a number after it. If your body is lacking Vitamin B1, you may feel fatigue and shaky. The recommended daily allowance for men is 1.5 milligrams. For women, 1.1 milligrams. 1

Thaimine is it Water Soluble and Fat Soluble ?

Nutritionists categorize vitamins by the materials that a vitamin will dissolve in. There are two categories: water-soluble and fat-soluble vitamins. Water-soluble vitamins, which include the B-complex group and vitamin C, travel through the bloodstream. Whatever water-soluble vitamins are not used by the body are eliminated in urine, which means you need a continuous supply of them in your food. Vitamin B1 is a water-soluble vitamin. 2

Thiamine in Plants and Animals

Thiamine is found in both plants and animals and plays a crucial role in certain metabolic reactions, particularly, as mentioned, the conversion of carbohydrates (starches) into energy. For example, thiamine is essential during exercise, when energy expenditure is high. 3

The researchers knew that thiamine was normally found in roots, so they put thiamine in the culture medium and found that root growth did occur. Vitamin B1 is manufactured in 0lant leaves and sent to the roots, but if roots are cut off and placed in a petri plate, vitamin B1 stimulates growth of the roots when it saturates the culture medium. 4

Thiamine at the Cellular Level

Various B-complex vitamins assist in cellular energy production, by forming adenosine triphosphate (ATP), the cells' energy source. Vitamin B1 is essential for every cell, and processes carbohydrates, proteins, and fats. Vitamin B2, which can serve as an antioxidant, is essential for activating folic acid and vitamin B6, and for processing fats and amino acids. Vitamin B3 assists in transforming carbohydrates into fats, and also processes alcohol. One specific form, niacin, is responsible for cholesterol regulation. Besides its role in energy production, vitamin B5 is required for forming lipids (fats), steroids and neurotransmitters. One B5 by-product, pantethine, may help lower cholesterol and triglyceride blood levels. Biotin is essential for fat and carbohydrate metabolism, supporting cell and nerve tissue growth and development. 5

Because thiamin plays a part in the reactions that supply the body with energy, "stress formula" supplements often tout it as a cure for stress and fatigue. Although thiamin does not provide energy itself, it helps turn the food you eat into energy. If you're marginally low in thiamin, a supplement will help squeeze more energy out of your food. But deficiencies aren't common if you eat a varied diet of whole foods. 6

Thiamine works with the other B vitamins to change protein, carbohydrate, and fat to energy. It is especially vital for changing carbohydrates to energy. It is a key factor in the healthy functioning of all the body's cells, especially the nerves. 7

Thiamin is utilized by the liver, brain, and other tissues to synthesize thiamin diphosphate (TDP), the active form of thiamin. TDP is critical for the metabolism of carbohydrates into energy (ATP) by serving as a coenzyme for the oxidative decarboxylation of pyruvate and alpha-ketoglutarate. Thiamin by Jarrow Formulas is manuafactured according to the highest pharmaceutical standards and uses only the best quality raw ingredients. Click here for more information. 8

Vitamin B1 is a water soluble vitamin that readily enters and exits the body daily so it must be taken internally on a daily basis. Vitamin B1 is a crystalline, yellow-white, water-soluble compound that is heat and alkali reactive when placed in solution. Thiamin helps maintain a normal metabolism and helps burn carbohydrates. Vitamin B1 is found in most whole grains. 10

Thiamin Prevents Disease such as BeriBeri

In its most common form, the disease was characterized by muscular weakness , energy deprivation, and inactivity. Sailing voyages were a common backdrop for the appearance of beriberi, and the addition of whole grains to ships rations was discovered to prevent its occurrence. By 1926, researchers discovered that the preventive substance in whole grains that could also remedy the energy deprivation in the ships' crews was vitamin B1. 9

Since vitamin B1 works in concert with other members of the B complex, a multivitamin supplement that contains all of the B vitamins is usually recommended, unless a specific B1 deficiency is being treated. Because vitamin B1 is water-soluble, the body excretes excess amounts of the nutrient, so there is little danger of overdose. 11

Most cells in the body depend on sugar as an energy source. When oxygen is used to help convert sugar into usable energy, the process of energy generation is called aerobic energy production. This process cannot take place without adequate supplies of vitamin B1, since B1 is part of an enzyme system (called the pyruvate dehydrogenase system) that enables oxygen-based processing of sugar. 12

Vitamin B1 and its deficiency leading Depression Vitamin B1 is essential for nerve stimulation and for metabolism of carbohydrates to give brain energy as well as body energy. Deficiency symptoms include mood disorders, anxiety, insomnia, restlessness, night terror etc. 13

Because vitamin B1 is so important in energy production, and because food energy is usually measured in terms of calories, vitamin B1 is often prescribed in relationship to caloric intake. For example, recommendations sometime suggest intake of 0.5 milligrams of B1 for every 1,000 calories consumed. 14

Thiamine and the Nervous System

Vitamin B1 also plays a key role in support of the nervous system, where it permits healthy development of the fat-like coverings which surround most nerves (called myelin sheaths). In the absence of vitamin B1, these coverings can degenerate or become damaged. Pain, prickly sensations, and nerve deadening are nerve-related symptoms that can result from vitamin B1 deficiency. 15

Vitamin B1 is needed to process carbohydrates, fat, and protein. Every cell of the body requires vitamin B1 to form the fuel the body runs on - ATP. Nerve cells require vitamin B1 in order to function normally. Vitamin B1 (thiamine) assists in blood formation, carbohydrate metabolism, and the production of hydrochloric acid, which is important for proper digestion. Vitamin B1 (thiamine) also enhances circulation and optimizes cognitive activity and brain function. Vitamin B1 (thiamine) has a positive effect on energy, growth, normal appetite, and learning capacity, and is needed for muscle tone of the intestines, stomach, and heart. Vitamin B1 acts as an antioxidant, protecting the body from generative effects of aging, alcohol consumption, and smoking. May improve glucose tolerance and retard arterial blockages, especially in diabetics. 16

Foods Containing Thiamin Vitamin B1

Thiamin is available in nutritional supplements in the form of thiamin hydrochloride and thiamin nitrate. These are also the forms used for food fortification. Thiamin pyrophosphate or cocarboxylase may also be available in some products. Vitamin B1 is the first part which is separated from the rest of the complex. Thiamine helps prevent beriberi. Although this vitamin can now be synthetically prepared, it can be found in Liver, port, yeast, nuts, and some grains. An average adult requires 2 to 3 grams of vitamin B1. Breads, flour and cereals are now enriched with thiamine so there is no longer a worry of deficient Vitamin B1 intake, which would cause beriberi. The highest concentrations of vitamin B1 are found in muscle, heart, liver, kidneys, and brain. 17

Taking any one of the B complex vitamins for a long period of time can result in an imbalance of other important B vitamins. For this reason, it is generally important to take a B complex vitamin with any single B vitamin. 18

Thiamine works with the other B vitamins to change protein, carbohydrate, and fat to energy. It is especially vital for changing carbohydrates to energy. It is a key factor in the healthy functioning of all the body's cells, especially the nerves. Vitamin B1 helps the body cells convert carbohydrates into energy. It is also essential for the functioning of the heart, muscles, and nervous system. As a coenzyme, thiamin plays a key role in energy production, conversion of glucose to fat. Every cell of the body requires vitamin B1 to form the fuel the body runs on - ATP. Nerve cells require vitamin B1 in order to function normally. 19

Vitamin B1 should not be taken at the same time as the antibiotic tetracycline because it interferes with the absorption and effectiveness of this medication. Vitamin B1 either alone or in combination with other B vitamins should be taken at different times from tetracycline. 20

References

  • www.costcutworld.com
  • www.lifeclinic.com
  • www.umm.edu
  • www.coopext.colostate.edu
  • www.vitacost.com
  • recipes.howstuffworks.com
  • health.discovery.com
  • www.vitamins-supplements.org
  • www.whfoods.com
  • www.vitamins-supplements.org
  • vitamins.ultimatefatburner.com
  • www.whfoods.com
  • www.depression-guide.com
  • www.whfoods.com
  • www.whfoods.com
  • www.vitamins-supplements.org
  • www.vitamins-supplements.org
  • www.umm.edu
  • www.vitamins-supplements.org
  • www.umm.edu
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    Thiamine Vitamin PDF Print E-mail
    Written by Bean   

    Thiamine a Water-Soluble Vitamin

    Thiamine is a member of the B family of vitamins (B Complex). It was the first water-soluble vitamin discovered. Like all the B vitamins, thiamine (or vitamin B-1) is best known for its role in the production of energy. Although rare in the United States, beriberi is the most common disease associated with thiamine deficiency. Water-Soluble Thiamine

    Vitamin B1, more commonly known as thiamine, is a water-soluble vitamin and part of the B vitamin family. B vitamins help support adrenal function, help calm and maintain a healthy nervous system, and are necessary for key metabolic processes. Thiamine B Vitamin

    Vitamin B1 is a water soluble vitamin that readily enters and exits the body daily so it must be taken internally on a daily basis. Vitamin B1 is a crystalline, yellow-white, water-soluble compound that is heat and alkali reactive when placed in solution. Thiamin helps maintain a normal metabolism and helps burn carbohydrates. Vitamin B1 is found in most whole grains. Thiamin for Normal Metabolism

    Thiamine Is Heat Sensitive

    Thiamin or Thiamine is an organic and water-soluble vitamin belonging to the B-complex family. Also known as Vitamin B1 or Aneurine, Thiamin is heat sensitive and needs to be stored in cool places. The chemical structure includes a thiazole and pyrimidine ring. Vitamin B1

    Thiamin is a water-soluble B vitamin that helps your cells produce energy from carbohydrates. It is essential for the functioning of the heart, muscles and nervous system because it plays a role in conducting nerve impulses and in muscle contraction. Thiamine Role

    Thiamine B vitamins are complex, water-soluble organic chemicals, often containing heterocyclic a coenzyme. Coenzymes are cofactors essential to the catalytic activity of enzymes. Thiamin is also known as vitamin B 1 . Thiamine Heterocyclic

    RDA Of Thiamine

    The U.S. RDA for thiamine is the amount of the vitamin used as a standard in nutrition labeling of foods. This allowance is based on the 1968 Recommended Dietary Allowances (RDA) for 24 sex-age categories set by the Food and Nutrition Board of the National Academy of Sciences. The 1989 RDA has been set at 1.1 milligrams per day for women 19 to 50 years of age and 1/5 milligrams for men 19 to 50 years of age. Thiamine RDA

    Thiamine as a Natural Mosquito Repellent

    Other claims for thiamine Vitamin B1 as a Natural Mosquito Repellent come from several thiamine patch suppliers. The patches are thiamine enriched whereby absorption of thiamine is through the skin or trans-dermal. But, a steady regimen of Vitamin B1 may easier to take orally. An interesting way to determine the time that ingested thiamine has been reduced in your system is to to take some B12 with it. Most have noticed the bright yellow in urine as a result of B12. When this bright yellow has faded or subsided, it is about time to take some more. Natural Mosquito Repellent

    Lack of Thiamine and Depletion

    Since very little thiamin is stored in the body, depletion can occur in as little as two weeks. Symptoms of thiamine deficiency (also known as "beriberi") can result from inadequate intake or excessive loss of thiamine from the body, an increased requirement for thiamine, or consumption of anti-thiamine factors in food. Some people are at a higher risk for thiamine deficiency, including chronic alcoholics, patients who receive intravenous feeding for more than seven days without additional multivitamins or dietary thiamin, and people on kidney dialysis. Loss of Thiamin

    Lack of thiamin causes the deficiency disease called beriberi, which has been known since antiquity. More recently, at least in industrialized nations, thiamine deficiency has been mainly found in association with chronic alcoholism, where it presents as the Wernicke-Korsakoff syndrome. Thiamine Deficiency

    Because thiamin deficiency often occurs with other B vitamin deficiencies, multiple water-soluble vitamins are usually given for several weeks. Patients should continue to consume a nutritious diet, supplying 1 to 2 times the daily recommended intake (DRI) of vitamins; all alcohol intake should stop. B Vitamin Deficiencies

    Thiamine Side Effect

    Thiamin (Vitamin B1) is a water-soluble vitamin and as such, it is least likely to reach toxic levels. However, there is an exception. When Thiamin is taken intravenously (injections), it has been reported to cause anaphylactic shock in few people. Thiamin Side Effect

    Toxicity is very rare as excess thiamin is excreted in the urine. Long-term excessive use can produce symptoms of hyperthyroidism: headache, irritability, trembling, rapid pulse and insomnia. With injected thiamine, reactions of itching, weakness, gastrointestinal bleeding, low blood pressure, pain, sweating, nausea, tingling and faintness can sometimes occur. The lowest daily dose known to cause side effects is 5 mg, but many people can tolerate much larger doses. Thiamine Toxicity

    Thiamine Advanced Study

    Thiamin is released by the action of phosphatase and pyrophosphatase in the upper small intestine. At low concentrations the process is carrier mediated and at higher concentrations, absorption occurs via passive diffusion. Active transport is greatest in the jejunum and ileum. The cells of the intestinal mucosa have thiamin pyrophosphokinase activity, but it is unclear whether the enzyme is linked to active absorption. The majority of thiamin present in the intestine is in the phosphorylated form, but when thiamine arrives on the serosal side of the intestine it is often in the free form. The uptake of thiamine by the mucosal cell is likely coupled in some way to its phosphorylation/dephosphorylation. On the serosal side of the intestine, evidence has shown that discharge of the vitamin by those cells is dependent on Na+-dependent ATPase. Thiamin Absorption

    Thiamin, also called vitamin B1, helps the body to digest carbohydrates and perform other functions. Like other B vitamins, thiamine is not stored in the body, so poor diet can lead to deficiency in a relatively short period of time and possibly worsen the symptoms of heart failure. Although thiamin deficiency has not been extensively studied among heart failure patients, the researchers said that there are several reasons to be concerned about the problem. For instance, many heart failure patients have poor diets, and some earlier studies have indicated that diuretic medicines prescribed to help treat the condition may increase the losses of thiamin. Thiamine in heart failure patients

    Uptake of thiamine by cells of the blood and other tissues occurs via active transport. About 80% of intracellular thiamin is phosphorylated and most is bound to proteins. In some tissues, thiamine uptake and secretion appears to be mediated by a soluble thiamin transporter that is dependent on Na+ and a transcellular proton gradient. The highest concentration of the transporter have been found in skeletal muscle, heart, and placenta. Intracellular Thiamine

    Good Sources of Thiamine

    Thiamin is mostly found in whole-grain and enriched grain products like bread, pasta, rice, and fortified cereals. These foods are enriched with thiamin because the vitamin is often lost during the refining process. Pork, liver, and other organ meats are naturally high in thiamin. This table lists good food sources of thiamine. Thiamine Enriched

    Actually, dairy products and milk, most fruits, and most vegetables are not very high in thiamine, but when consumed in large amounts and regularly they can become a significant source. The U.S. RDA for thiamin is based on the amount of vitamin B-1 needed for daily consumption and that allowance is used as a standard in Nutrition labeling of foods. Foods containing Thiamine

    Thiamine Supplements

    Thiamine is available in nutritional supplements in the form of thiamin hydrochloride and thiamine nitrate. These are also the forms used for food fortification. Thiamin pyrophosphate or cocarboxylase may also be available in some products. Vitamin B1 is the first part which is separated from the rest of the complex. Thiamine helps prevent beriberi. Although this vitamin can now be synthetically prepared, it can be found in Liver, port, yeast, nuts, and some grains. An average adult requires 2 to 3 grams of vitamin B1. Breads, flour and cereals are now enriched with thiamine so there is no longer a worry of deficient Vitamin B1 intake, which would cause beriberi. The highest concentrations of vitamin B1 are found in muscle, heart, liver, kidneys, and brain. Thiamine Supplements

    Thiamine works with the other B vitamins to change protein, carbohydrate, and fat to energy. It is especially vital for changing carbohydrates to energy. It is a key factor in the healthy functioning of all the body's cells, especially the nerves. Vitamin B1 helps the body cells convert carbohydrates into energy. It is also essential for the functioning of the heart, muscles, and nervous system. As a coenzyme, thiamine plays a key role in energy production, conversion of glucose to fat. Every cell of the body requires vitamin B1 to form the fuel the body runs on - ATP. Nerve cells require vitamin B1 in order to function normally. Vitamin B1

     

    References

  • www.stjohn.org
  • www.drweil.com
  • www.ionnutrition.biz
  • www.highbeam.com
  • www.hoptechno.com
  • www.drweil.com
  • www.eatingwell.com
  • www.nap.edu
  • www.vitamins-supplements.org
  • www.trekfit.com
  • en.wikipedia.org
  • healthlibrary.epnet.com
  • www.news-medical.net
  • thiaminvitamin.com
  • www.vitamin-update.com
  • www.merck.com

     

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    Thiamine Phosphate Derivatives PDF Print E-mail

    The following information is appended to this site in case a little deeper research is required. In general this site is striving to maintain a plain language approach for the reader so that a well rounded and easily understood study of Thiamin can be accomplished.

    Thiamine Phosphate Derivatives:

    Currently there are four known natural thiamine phosphate derivatives:

    1. thiamine monophosphate (ThMP)
    2. thiamine diphosphate (ThDP) or thiamine pyrophosphate (TPP)
    3. thiamine triphosphate (ThTP)
    4. adenosine thiamine triphosphate (AThTP).
    • Thiamine Pyrophosphate (TPP) or Thiamine Diphosphate (ThDP)

    This is the active form of the Vitamin B1, Thiamine. Thiamin pyrophosphate (TPP) is a thiamine derivative that is cleaved by Thiamin Pyrophosphatase.

    Thiamine pyrophosphate (TPP), also known as thiamin diphosphate (ThDP), and cocarboxylase is a coenzyme for several enzymes that catalyze the dehydrogenation (decarboxylation and subsequent conjugation to Coenzyme A) of alpha-keto acids. Examples include:

    TPP is synthesized by the enzyme thiamin pyrophosphokinase, which requires free thiamin, magnesium, and adenosine triphosphate.

     

    References:

    http://en.wikipedia.org/wiki/Thiamin