Overview
Methylmalonic acid (MMA) is a naturally occurring dicarboxylic acid derived from the metabolism of branched-chain amino acids and odd-chain fatty acids. It plays a critical role in the propionate metabolic pathway, where it is converted to succinyl-CoA via a vitamin B12-dependent enzyme. Elevated levels of MMA in the body are a marker for vitamin B12 deficiency, making it valuable in clinical diagnostics. In industrial settings, MMA is used as an intermediate in organic synthesis and specialty chemical production. Its reactive carboxyl groups make it suitable for polymerization and pharmaceutical applications. The compound is typically supplied as a white crystalline powder with high purity grades for laboratory and commercial use.
Physical and Chemical Properties
Methylmalonic acid is a white, crystalline solid with a molecular weight of 118.09 g/mol. It has a melting point range of 129-131°C and is soluble in water and polar organic solvents like ethanol. The compound's density is approximately 1.45 g/cm³, and it exhibits typical dicarboxylic acid reactivity, including esterification and decarboxylation under specific conditions. MMA is stable under standard storage conditions but may decompose if exposed to high temperatures or strong oxidizing agents. Its pKa values (around 3.0 and 5.2) reflect its ability to donate two protons in aqueous solutions, making it useful in buffer formulations. The crystalline form is hygroscopic, requiring airtight packaging to prevent moisture absorption.
Main Applications
In clinical diagnostics, methylmalonic acid is a key biomarker for assessing vitamin B12 status. Elevated urinary or serum MMA levels indicate functional B12 deficiency, even when blood tests appear normal. This application drives demand in medical laboratories and research institutions. Industrially, MMA serves as a precursor for specialty chemicals, including polymers, plasticizers, and pharmaceuticals. Its bifunctional nature allows for cross-linking in resin production. In biochemistry, it is used to study metabolic pathways, particularly those involving propionate metabolism and mitochondrial dysfunction. Emerging applications include its use in biodegradable materials and as a chelating agent in certain formulations.
Safety and Storage
Methylmalonic acid is classified as a mild irritant to skin, eyes, and respiratory system. Proper personal protective equipment (PPE) such as gloves and goggles should be worn when handling. Avoid inhalation of dust and ensure adequate ventilation in workspaces. For storage, keep containers tightly sealed in a cool, dry place away from direct sunlight. Ideal storage temperatures range between 15-25°C. Incompatible materials include strong bases and oxidizing agents. Shelf life is typically 2-3 years when stored correctly. Spills should be contained with inert absorbents and disposed of according to local regulations for organic acids.
B2B Procurement Guide
When sourcing methylmalonic acid, specify purity requirements (e.g., ≥95%, ≥98%) based on application. Pharmaceutical or diagnostic uses may require USP or analytical-grade material with certificates of analysis. Bulk quantities (25kg drums) offer cost savings for industrial users. Reliable suppliers include specialty chemical distributors and manufacturers with ISO certification. Request SDS documentation and batch-specific testing reports. Lead times vary; maintain buffer stock for time-sensitive applications. Price fluctuations may occur due to raw material availability, with technical-grade typically 20-30% cheaper than high-purity variants. Consider incoterms and logistics for international shipments to avoid delays.
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