Overview
DL-Proline is a racemic mixture of the amino acids L-proline and D-proline, classified as a non-essential amino acid. It plays a critical role in collagen synthesis and cellular metabolism. Unlike other amino acids, proline has a secondary amine group, forming a unique five-membered ring structure. Proline is widely utilized in pharmaceuticals, particularly in peptide synthesis and as a stabilizer in injectable formulations. It also serves as a flavor enhancer in food products and a nutrient in cell culture media for biotechnological applications.
Physical and Chemical Properties
DL-Proline appears as a white crystalline powder with a melting point of 220-222°C (with decomposition). It is highly soluble in water but only slightly soluble in ethanol, owing to its polar nature. The compound is hygroscopic, requiring careful storage to prevent moisture absorption. The chiral nature of proline makes it valuable in asymmetric synthesis, where L-proline is the biologically active form. Its cyclic structure contributes to protein folding and stability, distinguishing it from linear amino acids.
Main Applications
In pharmaceuticals, DL-proline is used as an intermediate in drug synthesis, particularly for antibiotics and antiviral medications. Its ability to stabilize peptides enhances the shelf life of biologic drugs. The food industry employs proline as a flavor enhancer, especially in meat products and dairy. In biochemical research, it is a key component of cell culture media, supporting protein expression and tissue engineering.
Safety and Storage
DL-Proline poses minimal toxicity but requires standard safety precautions. Avoid inhalation of dust and direct skin contact; use gloves and goggles. Store in sealed containers at room temperature, away from moisture and light to prevent degradation. Disposal should comply with local regulations for organic compounds. Large-scale users should monitor humidity levels to prevent clumping and ensure consistent product quality.
B2B Procurement Guide
When procuring DL-proline, specify the required enantiomeric form (DL, L, or D) and purity grade (e.g., ≥98% for pharmaceutical use). Bulk buyers should request certificates of analysis (CoA) to verify composition and impurities. Reliable suppliers typically offer packaging options from 1 kg to ton quantities, with prices ranging from $20-$50/kg. Consider long-term contracts for stable pricing and supply chain continuity, especially for GMP-grade material.
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