L-Arginine (C₆H₁₄N₄O₂)
Description
L-Arginine (C₆H₁₄N₄O₂) is a semi-essential cationic amino acid that serves as a fundamental building block in protein synthesis and nitrogen metabolism. As a commercially significant extract, L-arginine is produced through multiple industrial-scale methods:
1. Fermentation Production (Primary Method):
Utilizes Corynebacterium glutamicum or Bacillus subtilis strains
Typical yield: 50-60 g/L fermentation broth
Downstream processing includes ion-exchange chromatography
Final purity: ≥98.5% by HPLC analysis
2. Enzymatic Conversion:
Starts from L-ornithine via argininosuccinate synthase
Requires ATP regeneration systems
Yields high stereochemical purity (≥99% L-isomer)
3. Plant-Based Extraction:
Primary sources: pumpkin seeds, chickpeas, and soy protein
Extraction yield: 2-5% of protein content
Requires extensive purification to remove lectins
Molecular Characteristics
Molecular weight: 174.20 g/mol
Isoelectric point: 10.76
Specific rotation: +27.6° (c=8 in 6N HCl)
pKa values: 2.17 (carboxyl), 9.04 (amino), 12.48 (guanidino)
Physicochemical Properties
Solubility Profile:
Water: 148.7 g/L (25°C)
Ethanol: 3.2 g/L
Glycerol: 56 g/L
Stability Parameters:
pH stability range: 4-9
Thermal decomposition: >230°C
Hygroscopicity: 0.5% moisture uptake (50% RH)
Technical specifications
Loss on drying: ≤0.5%
Residue on ignition: ≤0.1%
Heavy metals: ≤10 ppm
Specific optical rotation: +26.9° to +27.9°
Chloride content: ≤0.02%
Benefits
1. Formulation Versatility: Water-soluble with excellent stability in various matrices
2. pH Modulation: Buffering capacity across physiological pH ranges
3. Compatibility: Stable with most common excipients and nutrients
4. Process Adaptability: Suitable for multiple manufacturing techniques
Applications
1. Sports Nutrition:
Pre-workout formulations
Recovery product blends
Nitric oxide boosters
2. Clinical Nutrition:
Enteral feeding solutions
Wound healing formulations
Metabolic support products
3. Functional Foods:
Cardiovascular health beverages
Protein-fortified foods
Energy bar formulations
4. Cosmeceuticals:
Anti-aging serums
Hair growth treatments
Skin barrier repair creams
Product Processing
