Overview
Sodium Hyaluronate is a linear polysaccharide composed of repeating disaccharide units of D-glucuronic acid and N-acetyl-D-glucosamine. As the sodium salt of hyaluronic acid, it exhibits enhanced stability and solubility compared to its acidic form. Naturally occurring in connective tissues and synovial fluid, it plays a critical role in maintaining tissue hydration and elasticity. First isolated in 1934, it is now produced via bacterial fermentation (Streptococcus zooepidemicus) to ensure high purity and avoid animal-derived contaminants. Its multifunctional properties—including lubrication, shock absorption, and cell signaling—have made it indispensable in medical and cosmetic industries.
Physical and Chemical Properties
The compound forms viscous solutions even at low concentrations (0.1–2%), with viscosity directly proportional to molecular weight. High-molecular-weight HA (1,000–5,000 kDa) provides superior moisture retention, while low-molecular-weight fragments (50–300 kDa) penetrate skin barriers more effectively. It undergoes enzymatic degradation by hyaluronidases and is sensitive to oxidative stress. Solutions are pseudoplastic (shear-thinning) and exhibit pH stability between 4.0–9.0. Thermal sterilization above 121°C may cause depolymerization, necessitating aseptic processing for sterile applications.
Main Applications
In cosmetics, it is a cornerstone of anti-aging serums and moisturizers due to its ability to hold 1,000 times its weight in water. Medical-grade variants are used in intra-articular injections for osteoarthritis (e.g., Orthovisc®), ophthalmic surgeries (as viscoelastic agents), and post-surgical anti-adhesion barriers. The pharmaceutical industry employs it in nasal sprays for drug delivery and in wound dressings to accelerate tissue regeneration. Emerging applications include 3D bioprinting scaffolds and sustained-release drug carriers, leveraging its biodegradability and tunable mechanical properties.
Safety and Storage
Pharmaceutical-grade material must meet USP/EP standards with endotoxin limits <0.05 EU/mg. Powder formulations are hygroscopic and require desiccants to prevent clumping. Long-term storage at room temperature may reduce molecular weight; refrigeration is recommended for high-value grades. While generally non-irritating, injectable formulations require rigorous sterility testing. Occupational exposure to airborne powder may cause respiratory irritation—NIOSH-approved dust masks are advised during handling. Disposal should comply with local regulations for biodegradable polymers.
B2B Procurement Guide
Buyers must define key parameters: molecular weight (for functionality), particle size (for dissolution rate), and residual solvent levels (e.g., ethanol <5,000 ppm). Cosmetic-grade typically costs $10–$50/kg, while sterile injectable-grade commands $200–$500/kg. Supplier audits should verify GMP compliance, batch-to-batch consistency, and absence of streptococcal proteins. For bulk orders (>100 kg), negotiate testing protocols for viscosity (Brookfield method) and hyaluronidase resistance. Consider regional logistics—some grades require cold-chain transport to maintain stability.
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