Overview
D-Alanine is the dextrorotatory enantiomer of alanine, a non-proteinogenic amino acid. Unlike L-alanine, which is incorporated into proteins, D-alanine is primarily utilized in bacterial cell wall construction as a component of peptidoglycan. It is biosynthesized from L-alanine by alanine racemase and serves as a crucial building block in the microbial world. In industrial contexts, D-alanine is produced through chemical synthesis or enzymatic resolution. Its unique stereochemistry makes it valuable for chiral synthesis in pharmaceuticals and as a precursor for various bioactive compounds. The compound is classified as generally stable but should be protected from excessive moisture and heat.
Physical and Chemical Properties
D-Alanine appears as a white, odorless crystalline powder with a density of 1.424 g/cm³. It decomposes rather than melts at 297-300°C, a characteristic shared by many amino acids. The compound exhibits good water solubility (167 g/L at 25°C) but limited solubility in organic solvents like ethanol. Chemically, D-alanine is an amphoteric molecule containing both carboxyl and amino functional groups. Its isoelectric point (pI) is 6.00, similar to its L-isomer. The compound shows optical activity with a specific rotation of +14.5° (c=10, 1N HCl). These properties make it distinguishable from L-alanine in analytical methods such as polarimetry and chiral chromatography.
Main Applications
The primary industrial use of D-alanine is in antibiotic production, particularly for β-lactam antibiotics where it serves as a chiral building block. It's a key component in the synthesis of D-cycloserine, an anti-tuberculosis drug, and other antimicrobial agents targeting bacterial cell wall synthesis. In food technology, D-alanine functions as a flavor enhancer and sweetener adjunct, often combined with other amino acids to create umami taste profiles. Research laboratories utilize it for studying bacterial resistance mechanisms and developing enzyme inhibitors. Emerging applications include its use in peptide-based therapeutics and as a linker in bioconjugate chemistry.
Safety and Storage
D-Alanine is classified as low-toxicity but requires standard laboratory precautions. Inhalation of dust may cause respiratory irritation, while prolonged skin contact could lead to mild dermatitis. Appropriate PPE including gloves and safety goggles should be worn when handling bulk quantities. For storage, maintain the product in tightly sealed containers at room temperature (15-25°C) with low humidity. Under these conditions, the compound typically remains stable for at least 3 years. Bulk storage areas should be well-ventilated and separated from strong oxidizers. In case of spills, collect material using appropriate absorbents and dispose of according to local regulations.
B2B Procurement Guide
When sourcing D-alanine industrially, prioritize suppliers with ISO-certified manufacturing facilities. Key specifications to verify include: chemical purity (typically ≥98%), enantiomeric excess (≥99%), residual solvent levels, and heavy metal content. Pharmaceutical-grade material requires additional documentation like DMF files or CEP certificates. For large-volume purchases (100kg+), negotiate contracts with flexibility for batch testing and quality audits. Consider regional suppliers to minimize logistics costs, as the compound is produced in major chemical hubs including China, India, and Europe. Payment terms for B2B transactions commonly range from 30-60 days post-delivery, with letters of credit preferred for international deals.
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