Overview
L-Glutamine is the most abundant free amino acid in human blood and muscle tissue, classified as conditionally essential during metabolic stress. It serves as a critical nitrogen transporter and energy source for rapidly dividing cells, including enterocytes and immune cells. The compound is produced industrially via microbial fermentation (typically using Corynebacterium glutamicum) or enzymatic synthesis. Pharmaceutical-grade L-glutamine must meet strict purity standards (≥99%) as defined in USP/EP monographs, while technical grades are available for industrial applications.
Physical and Chemical Properties
As a polar, uncharged amino acid, L-glutamine exhibits excellent water solubility but poor stability in aqueous solutions above 40°C, where it cyclizes to pyroglutamic acid. The crystalline form remains stable under proper storage conditions with minimal hygroscopicity. Its amphoteric nature (pI = 5.65) allows versatile formulation across pH ranges. The γ-amide group participates in unique biochemical pathways distinct from other amino acids, including glutathione synthesis and ammoniagenesis.
Main Applications
In clinical nutrition, L-glutamine is administered to trauma/burn patients to prevent muscle catabolism and support wound healing. The sports supplement market utilizes its purported benefits for muscle recovery and glycogen replenishment post-exercise. Cell culture applications consume approximately 30% of industrial production, where it serves as an essential medium component for hybridoma and CHO cell lines. Emerging research explores its potential in gut barrier function modulation and oncology support therapies.
Safety and Storage
Proper storage requires protection from humidity (RH <60%) and temperatures below 25°C to prevent degradation. Bulk quantities should be packaged in multi-layer moisture-proof bags with desiccants. While oral LD50 exceeds 8000 mg/kg in rats, intravenous administration requires medical supervision due to potential ammonia accumulation. Workplace exposure limits follow general amino acid guidelines (10 mg/m³ respirable dust).
B2B Procurement Guide
Pharmaceutical buyers should insist on DMF-filed manufacturers with certified GMP facilities. Key quality parameters include optical purity (>99.5% L-isomer), heavy metals (<10 ppm), and endotoxin levels (<0.5 EU/mg for injectables). For cell culture applications, verify sterility testing and 0.1 µm membrane-filtered processing. Spot-check crystal morphology under microscopy - irregular crystals may indicate hydration issues. Consider Just-in-Time delivery for large orders to minimize storage duration.
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