Folic Acid
Founded in 2017, Sigma Chemical Co., Ltd. supplies over 100 countries with high-quality chemicals. We are dedicated to safety, innovation, and global cooperation.
Product Description
Folic acid, the synthetic, shelf-stable form of vitamin B9, underpins one of public health’s clearest victories: mandatory fortification of staple flours has cut neural-tube defect (NTD) prevalence by 21–46 % and saves the United States alone roughly US $600 million annually. Beyond this flagship outcome, the vitamin operates at the intersection of genetics and precision nutrition: the common C677T polymorphism of the enzyme MTHFR lowers the efficiency with which folate donates one-carbon units for DNA synthesis and methylation, raising homocysteine and disease risk; carriers may benefit more from the bioactive 5-methyl-tetrahydrofolate than from standard folic acid. Meta-analyses now link adequate folate status to modest reductions in stroke, congenital heart defects and orofacial clefts, while high-dose supplementation remains under scrutiny for potential cancer and cognitive interactions, especially when vitamin B12 is deficient. Despite three decades of evidence, only ~71 countries mandate fortification; extending this cheap, equitable intervention—via wheat, maize or dual-iodine/folate salt—remains a priority for achieving global child-mortality and health-equity targets.
Other Information
Regulatory & Commercial Status:
- Drug Status: An approved drug with a long history of use (first approved in 1982). Used in human and veterinary medicine.
- Cosmetic Ingredient: Listed as a skin-conditioning agent.
- Pesticide Status: Not approved as an active pesticide substance in the EU; listed under plant growth regulators in some databases.
Controversies & Policy:
- Fortification Debate: Despite overwhelming evidence of benefit in preventing NTDs, global adoption of mandatory folic acid fortification is incomplete, leading to a significant number of preventable birth defects annually.
- Dosage Optimization: Ongoing research into optimal dosing for specific outcomes beyond NTD prevention (e.g., preeclampsia, male fertility) and understanding long-term interactions in universally fortified populations.
Synthesis Methods
Biological Synthesis (Microorganisms & Plants):
- Pathway: Microbes and plants synthesize folate de novo from GTP (guanosine triphosphate), PABA (para-aminobenzoic acid), and glutamate via a complex, multi-step enzymatic pathway.
- Natural Form: Produces reduced, polyglutamated forms like tetrahydrofolate (THF), which are the biologically active coenzymes.
- Human Limitation: Humans lack the enzymes for de novo folate synthesis, making it an essential dietary nutrient.
Chemical Synthesis (Industrial Production):
- Primary Method: The commercial production of folic acid (the stable, oxidized synthetic form) primarily relies on chemical synthesis for efficiency and scalability.
- Process: Involves the coupling of a pteridine derivative (e.g., 2-amino-4-hydroxy-6-chloromethyl pteridine) with p-aminobenzoyl-L-glutamic acid.
- Refinement: The synthesis process has been refined in various patents to improve yield and purity.
- Bioengineering: Research focuses on engineering microbial systems (e.g., fungi) to produce natural, bioactive folates more efficiently, offering a potential alternative to chemical synthesis.
Modern & Emerging Approaches:
Uses and Applications
Nutritional & Public Health:
- Dietary Supplement: Used to prevent and treat folate deficiency and associated conditions like megaloblastic anemia.
- Mandatory Food Fortification: Added to staple foods (e.g., wheat flour, rice) to prevent neural tube defects (NTDs) and improve population folate status. This is a cost-effective public health strategy implemented in many countries.
- Pregnancy: Periconceptional supplementation (400 µg/day) is critical for preventing ~70-80% of NTDs (e.g., spina bifida, anencephaly). It may also play a role in reducing risks of other pregnancy complications like preeclampsia.
- Adjunct Therapy: Used alongside certain medications (e.g., methotrexate for rheumatoid arthritis, some antiepileptic drugs) to counteract folate depletion and mitigate side effects.
Medical & Therapeutic:
- Treatment of Deficiencies: For megaloblastic anemia due to folate deficiency.
- Male Fertility: May improve sperm motility in cases of male infertility.
Nanotechnology & Research:
- Precursor for Carbon Dots: Serves as a carbon source for synthesizing fluorescent carbon quantum dots (C-dots), which have potential applications in bioimaging and biosensing due to their blue fluorescence, low toxicity, and biocompatibility.
Properties and Characteristics
Physicochemical Properties:
- Melting Point: Decomposes at approximately 250°C (482°F).
- Solubility: Very slightly soluble in water (1.6 mg/L at 25°C). Soluble in dilute alkali solutions, less so in alcohols; insoluble in acetone, chloroform, and ether.
- Stability: Crystalline form is relatively stable. Aqueous solutions are heat-sensitive and decompose rapidly in the presence of light and/or riboflavin.
- Optical Rotation: Specific optical rotation [α] = +23° (c=0.5 in 0.1 N NaOH).
Biochemical & Functional Properties:
- Bioavailability: The synthetic form (folic acid) is more stable and has higher bioavailability than natural food folates.
- Metabolic Role: A water-soluble B vitamin (B9). Its biologically active forms (tetrahydrofolate and derivatives) are essential cofactors in one-carbon transfer reactions.
Key Functions:
- Nucleotide (purine and pyrimidine) biosynthesis for DNA/RNA synthesis and repair.
- Amino acid metabolism (e.g., homocysteine remethylation to methionine).
- Essential for normal erythropoiesis (red blood cell formation).
- Acts as an antioxidant, helping to scavenge free radicals.
Safety and Handling
General Safety:
- Hazards: It is generally safe at recommended doses.
- Physical Handling: Appears as a solid powder. Standard laboratory precautions for handling chemicals are advised.
Health Safety & Interactions:
- Established Safety: No validated evidence that physiologic or super-physiologic doses cause liver injury or jaundice. Does not increase risks of cancer, cognitive impairment, or diabetes at recommended levels.
- Key Interaction: High-dose folic acid supplementation can mask the hematological signs of vitamin B12 deficiency (pernicious anemia), potentially allowing neurological damage to progress undetected. Monitoring of B12 status is important in fortified populations.
- Drug Interactions: May interact with certain medications, including:
- Antifolates (e.g., Methotrexate): Folic acid is used to reduce side effects.
- Antiepileptics (e.g., Phenytoin, Carbamazepine): These drugs can lower folate levels, and supplementation is often required.
- Incompatibilities: Incompatible with chloral hydrate, ferrous sulfate, sulfonamides, strong oxidizing agents, and strong acids or bases.