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D-biotin Powder, also known as biotin, vitamin H, or coenzyme R, is a water-soluble B-complex vitamin (vitamin B7). Molecular formula C biotin 10H16N2O3S, CAS 200-399-3, appears as white crystalline powder or colorless elongated needle shaped crystals. It has good solubility in solvents such as hot water, dimethyl sulfoxide, alcohol, and benzene, but is not easily soluble in other common organic solvents. This solubility characteristic makes it have broad application potential in food processing and preparation processes. It also has important physiological functions and wide application value. For example, it can be used as a nutritional supplement as a processing aid in the food industry; In the field of medicine, it can be used to treat certain skin diseases and promote lipid metabolism, etc; In addition, it can also be used as a fortifier in infant and toddler food, as well as for the labeling production of proteins, antigens, antibodies, nucleic acids (DNA, RNA), etc. As a coenzyme of various carboxylases in living organisms, it plays a crucial role in cell growth, fatty acid synthesis, gluconeogenesis, and protein and fat metabolism.
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Chemical Formula |
C10H16N2O3S |
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Exact Mass |
244 |
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Molecular Weight |
244 |
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m/z |
244 (100.0%), 245 (10.8%), 246 (4.5%) |
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Elemental Analysis |
C, 49.16; H, 6.60; N, 11.47; O, 19.65; S, 13.12 |
D-biotin, also known as vitamin B7 or coenzyme R, is a water-soluble vitamin that plays a crucial role in multiple metabolic processes in the human body. As a coenzyme of many enzymes, D-biotin participates in various biochemical reactions and is of great significance for maintaining normal physiological functions in the human body.
The function of D-biotin powder
1. Participate in lipid metabolism
D-biotin plays a crucial role in lipid metabolism. Firstly, it participates in the synthesis of fatty acids and is an essential substance for the normal synthesis and metabolism of long-chain unsaturated fatty acids. In addition, D-biotin is also related to the synthesis of acetylcholine and cholesterol metabolism, helping to maintain blood lipid balance and normal nervous system function.
2. Participate in protein and nucleic acid metabolism
D-biotin also plays an important role in protein and nucleic acid metabolism. It is involved in protein synthesis, amino acid deamination, purine synthesis, aminoacyl transfer, as well as leucine and tryptophan catabolism, and is necessary for the transfer and decarboxylation of various amino acids. In addition, D-biotin also participates in the synthesis and repair of nucleic acids (DNA and RNA), playing a crucial role in the transmission and expression of genetic information.
3. Participate in carbohydrate metabolism
In carbohydrate metabolism, D-biotinase participates in catalytic decarboxylation and carboxylation reactions and is an essential component of the tricarboxylic acid cycle. Through this process, D-biotin helps the body generate energy and maintain normal cell function.
4. Participate in the metabolism of other substances
In addition to the three main metabolic processes mentioned above, D-biotin also participates as a coenzyme component in other nutrient metabolism processes such as methylation transfer and sugar metabolism. These metabolic processes are of great significance for maintaining normal physiological functions in the human body.
5. Cell proliferation and differentiation
D-biotin plays an important role in cell proliferation and differentiation. It helps maintain normal cell growth and division, and is particularly important for maintaining the health of the skin, hair, and nails. In addition, D-biotin is also involved in the development process of the fetus and has a significant impact on the formation and growth of the embryo.
6. Improving skin health
D-biotin has a significant impact on skin health. It can promote the renewal and repair of skin cells, improve skin elasticity and glossiness. In addition, D-biotin can also reduce skin inflammation and allergic reactions, and has certain therapeutic effects in treating certain skin diseases such as acne and eczema.
7. Promote healthy hair and nails
D-biotin is also of great significance for the health of hair and nails. It can promote the growth and repair of hair and nails, improve their quality and appearance. D-biotin has a positive improvement effect on thin and brittle hair and nails.
8. Regulating blood sugar levels
D-biotin can help regulate blood sugar levels and improve insulin sensitivity. For patients with diabetes, D-biotin supplementation is helpful to control blood sugar level and reduce complications.
9. Lowering cholesterol levels
D-biotin can promote fat metabolism and lower cholesterol levels. This helps to prevent the occurrence of cardiovascular diseases and maintain cardiovascular health.
10. Other functions
In addition to the above functions, D-biotin also has some other physiological effects. For example, it can promote intestinal health and improve digestive function; Enhance immunity and enhance body resistance; Relieve stress and anxiety, etc.
In organic synthetic chemistry, the synthesis of D-biotin powder is a complex but important process. Biotin is a water-soluble B-group vitamin that plays an indispensable role in maintaining normal physiological functions in the human body.
Detailed steps
Step 1: Debenzylation/cyclization reaction
Reagents and conditions:
Starting substance:
5-[(1R, 3aS, 6aR)-4,6-dibenzyl-5-oxohexahydro-1H-thiopheno [3,4-d] imidazol-1-yl] valerate II
Inorganic acids:
Such as hydrochloric acid, sulfuric acid, etc., used to catalyze debenzylation reactions
Organic solvents:
Such as methanol, ethanol, etc., used as reaction media
Reaction conditions:
Room temperature to reflux temperature, stirring for several hours.
Operation process:
1. Dissolve the starting substance 5- [(1R, 3aS, 6aR) -4,6-dibenzyl-5-oxohexahydro-1H-thiopheno [3,4-d] imidazol-1-yl] valerate II in a selected organic solvent.
2. Slowly add inorganic acids, control the reaction temperature, and continue stirring.
3. Monitor the reaction process and stop the reaction when the debenzylation and cyclization reactions are basically completed.
Chemical equation:
Benzyl 5- [(1R, 3aS, 6aR) -4,6-di (R1) -5-oxohexahydro-1H-thiopheno [3,4-d] imidazol-1-yl] valerate II+HX (Inorganic Acid) → (2S, 3S, 4S) -5-(3,4-diamino-tetrahydrothiophene-2-yl) valerate hydrochloride III +R1-H (benzyl alcohol)+other by-products
Note: This equation only represents the main reaction pathway, and other by-products may be generated in actual reactions.
Step 2: Ring closing reaction and acidification
Reagents and conditions:
Starting substance:
(2S, 3S, 4S)-5-(3,4-diamino-tetrahydrothiophene-2-yl) valerate hydrochloride III
01
Cyclization reagents:
Such as formaldehyde, formic acid, etc., used to promote cyclization reactions
02
Alkaline solvents:
Aqueous solutions such as sodium hydroxide and potassium hydroxide, used to neutralize hydrogen halides and provide an alkaline environment
03
Organic solvents:
Such as methanol, ethanol, etc., used as reaction media
Reaction conditions:
Room temperature to reflux temperature, stirring for several hours
05
Operation process:
1. Dissolve the starting substance (2S, 3S, 4S)-5-(3,4-diamino-tetrahydrothiophene-2-yl) valerate hydrochloride III in a selected organic solvent.
2. While stirring, slowly add alkaline solvent to neutralize the halogenated salt and create an alkaline environment.
3. Then add the cyclization reagent and continue stirring the reaction.
4. Monitor the reaction process and stop the reaction when the ring closing reaction is basically completed.
5. Directly add acids (such as hydrochloric acid and sulfuric acid) for acidification to convert the product into d-biotin.
Chemical equation:
(2S, 3S, 4S)-5-(3,4-diamino-tetrahydrothiophene-2-yl) valerate hydrochloride III+base (such as NaOH) → (2S, 3S, 4S)-5-(3,4-diamino-tetrahydrothiophene-2-yl) valerate (neutralization reaction)
(2S, 3S, 4S)-5-(3,4-diamino-tetrahydrothiophene-2-yl) valeric acid+cyclization reagent (such as HCHO) → intermediate product (specific structure omitted, complex cyclization process)
Intermediate product+HX (inorganic acid) → C10H16N2O3S +other by-products
D-biotin powder, also known as vitamin H or coenzyme R, is a water-soluble B-group vitamin that plays a crucial role in maintaining normal physiological functions in the human body. In recent years, with the rapid development of biotechnology, the use of biological methods to synthesize D-biotin has become an efficient and environmentally friendly preparation method.
Synthesis steps
1. Strain screening and cultivation
In the process of synthesizing D-biotin through biological methods, it is first necessary to screen strains with high biotin synthesis ability. At present, strains commonly used for D-biotin synthesis include Escherichia coli and Bacillus subtilis. Through genetic engineering methods, engineering strains that efficiently express genes related to D-biotin synthesis can be constructed.
After selecting suitable strains, it is necessary to cultivate them. Usually, strains are cultured in a medium containing an appropriate amount of carbon, nitrogen, inorganic salts, and growth factors. The cultivation conditions such as temperature, pH value, and ventilation rate need to be optimized according to the characteristics of the strain.
2. Fermentation production
After the strain is cultured to a certain density, fermentation can begin to produce D-biotin. During the fermentation process, the strains utilize the nutrients in the culture medium for metabolism to synthesize D-biotin. The fermentation process requires control of temperature, pH value, ventilation rate and other conditions to ensure the normal growth of strains and efficient synthesis of D-biotin.
In order to further increase the yield of D-biotin, the fermentation process can be optimized by adding inducers, precursor substances, and other methods. For example, adding precursor substances such as adenosine and pyruvate for biotin synthesis can increase the rate of D-biotin synthesis.
3. Extraction and purification
After fermentation, it is necessary to extract and purify the fermentation broth to obtain high-purity D-biotin products. Common extraction methods include solvent extraction, ion exchange, adsorption, etc. Among them, solvent extraction method is widely used due to its simple operation and low cost.
During the extraction process, it is important to choose appropriate solvents and extraction conditions to ensure the extraction efficiency and purity of D-biotin. The extracted solution needs to be concentrated and dried to remove solvents and moisture.
The purification process usually uses methods such as crystallization, recrystallization, and chromatographic separation. These methods can effectively remove impurities and improve the purity of D-biotin. During the purification process, it is necessary to control conditions such as temperature and solvent ratio to ensure the purification effect.
4. Product testing
After extraction and purification, quality testing of D-biotin products is required. Common detection methods include high-performance liquid chromatography (HPLC), mass spectrometry (MS), etc. These methods can accurately determine the content, purity, and structure of D-biotin.
At the same time, it is necessary to evaluate the safety of the product. This includes checking whether the product contains toxic and harmful substances, and whether it meets relevant standards and regulatory requirements. Only through strict quality testing and safety assessment can the quality and safety of D-biotin products be ensured.
adverse reaction
D-Biotin, also known as vitamin H or coenzyme R, is an important member of the water-soluble B vitamins (B7) and is widely involved in the metabolism of fatty acids, amino acids, and glucose. As a coenzyme, it serves as a carrier of CO ₂ in carboxylase reactions and is crucial for maintaining skin, hair, nail health, and nervous system function. Although D-biotin powder is widely used in the fields of nutritional supplementation, cosmetics, and biotechnology, its adverse reactions still need to be taken seriously.
Allergic reactions: ranging from mild to severe immune responses
typical symptoms
Skin reactions: Rash (erythema, itching, papules) and urticaria are common manifestations of allergies, which may be limited to the contact area or spread throughout the body.
Mucosal symptoms: Conjunctivitis (redness, tearing), swelling of the lips or tongue, and possible difficulty swallowing.
Systemic reactions: Severe allergies may cause vascular edema (swelling of the face and throat), difficulty breathing, hypotension, and even anaphylactic shock, requiring emergency medical intervention.
risk factors
Individual sensitivity: Individuals who are allergic to biotin or excipients (such as fillers and preservatives) have a significantly increased risk.
Dose dependence: High dose supplementation (such as 10mg or more per day) may increase the risk of allergies, although the specific mechanism is not yet clear.
Cross reactivity: In rare cases, biotin may bind to streptavidin (used for biological detection), triggering immune complex deposition related reactions.
Handling suggestions
Stop medication immediately: If allergic symptoms occur, stop using immediately and avoid contact again.
Symptomatic treatment: Mild reactions can be treated with oral antihistamines (such as cetirizine), while severe cases require injection of adrenaline and medical attention.
Allergen testing: Confirm allergens through skin prick tests or serum specific IgE testing to guide future medication.
Gastrointestinal discomfort: dual effects of dosage and individual differences
Common Symptom
Digestive disorders: bloating, belching, and early satiety may be related to the increased burden on the gastrointestinal tract caused by biotin promoting fatty acid synthesis.
Diarrhea: High doses of biotin may accelerate intestinal peristalsis, reduce water absorption, and cause watery stools.
Nausea/vomiting: A small number of individuals are sensitive to biotin, which can be easily induced when taken on an empty stomach or at excessive doses.
Dose effect
Recommended dosage: Adults usually tolerate 30-100 μ g per day, but supplement doses often reach 1-10mg/day, significantly higher than demand.
Threshold effect: When daily intake exceeds 10mg, the incidence of gastrointestinal discomfort increases, but individual differences are significant.
Mechanism exploration
Intestinal microbiota interference: Biotin may affect the metabolism of certain intestinal bacteria, leading to gas production or changes in short chain fatty acid levels.
Delayed gastric emptying: High doses of biotin may delay gastric emptying, increase gastric pressure, and cause discomfort.
Mitigation strategies
Split administration: Divide the daily dose into 2-3 doses to reduce single gastrointestinal irritation.
Taken with meals: Taking with food can reduce the risk of gastrointestinal discomfort, especially for sensitive individuals.
Dose adjustment: If symptoms persist, gradually reduce the dosage to a tolerable level or consult a doctor to change the dosage form (such as sustained-release tablets).
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