Overview
Alanine is a simple α-amino acid that serves as a building block for proteins and plays crucial roles in metabolic pathways. As one of the 20 standard amino acids, it exists in two enantiomeric forms: L-alanine (the proteinogenic form) and D-alanine (found in bacterial cell walls). Industrially produced through microbial fermentation or chemical synthesis, it's classified as a non-essential amino acid because the human body can synthesize it. The global market for alanine is driven by its pharmaceutical applications (particularly in parenteral nutrition), sports supplement formulations, and as a flavor enhancer in food products. Its relatively simple structure and stability make it a preferred choice for various biochemical applications compared to more complex amino acids.
Physical and Chemical Properties
Alanine crystallizes as a white, odorless powder with a slightly sweet taste. It shows excellent thermal stability, decomposing rather than melting when heated. The amino acid is zwitterionic at physiological pH, containing both a carboxylate anion and an ammonium cation. This property contributes to its high water solubility and low volatility. Chemically, alanine's methyl side chain makes it one of the most hydrophobic amino acids, though it's still more hydrophilic than aromatic amino acids. Its pKa values are 2.34 (carboxyl group) and 9.69 (amino group). The isoelectric point (pI) is approximately 6.01. These properties make it particularly useful in buffer systems and as a reference compound in chromatographic analyses.
Main Applications
In pharmaceuticals, alanine serves as an excipient in tablet formulations and a component in amino acid infusion solutions. Its ability to participate in the glucose-alanine cycle makes it valuable for liver function support. The supplement industry utilizes alanine (especially β-alanine) for muscle performance enhancement and carnosine synthesis. The food industry employs alanine as a flavor enhancer (E-number E640) and sweetener potentiator. In technical applications, it's used in chiral synthesis and as a raw material for biodegradable polymers. Recent research explores its potential in cryoprotectant formulations and as a component in cell culture media for biotechnology applications.
Safety and Storage
Alanine is classified as Generally Recognized As Safe (GRAS) by the FDA when used in accordance with good manufacturing practices. No known toxicity exists at normal consumption levels, with an LD50 >5000 mg/kg in rats for oral administration. However, dust inhalation should be avoided in industrial settings. Proper storage requires protection from moisture and extreme temperatures. Bulk material should be kept in original packaging or airtight containers to prevent caking. Under recommended conditions, the shelf life typically exceeds 36 months. Material safety data sheets (MSDS) should always be consulted for specific handling procedures, especially in pharmaceutical-grade applications where cross-contamination must be prevented.
B2B Procurement Guide
Industrial buyers should specify required enantiomeric purity (L-, D-, or DL-form), as applications differ significantly. Pharmaceutical-grade material typically requires USP/EP certification with detailed analytical reports. Food-grade material must comply with relevant regional standards (FDA, EFSA, etc.). Key procurement considerations include batch-to-batch consistency testing, residual solvent analysis (for synthetically produced material), and heavy metal content verification. Large-volume buyers (typically >1 metric ton) can negotiate better pricing, especially for contract manufacturing arrangements. Logistics planning should account for material hygroscopicity during transportation. Suppliers with ISO 9001 certification and GMP compliance are preferred for critical applications.
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