Lysozyme

When purchasing Lysozyme, the most critical factor is Enzymatic Activity, usually measured in Units per milligram (U/mg). For food preservation, an activity level of 20,000 U/mg is common, whereas pharmaceutical grades may require >40,000 U/mg. You must also verify the Purity level (typically >95%) and the Source (most commercial lysozyme is derived from Egg White/Hen Egg White Lysozyme - HEWL). Ensure the pH stability range (usually 3.0 to 7.0) aligns with your specific application to prevent denaturation.

As a biological enzyme used in food and medicine, suppliers must provide ISO 9001 and ISO 22000 (FSMS) certifications. For food-grade applications, HACCP, Halal, and Kosher certifications are often essential for global market access. If the product is intended for the US market, ensure it meets FDA GRAS (Generally Recognized as Safe) status; for the EU, it must comply with EFSA regulations and carry the appropriate E-number (E1105).

Buyers should request a Certificate of Analysis (COA) for every batch. During sampling, test the Solubility in water; high-quality Lysozyme should form a clear, colorless to pale yellow solution without precipitates. Perform a Thermal Stability Test, as Lysozyme is relatively heat-stable in acidic conditions but loses activity in alkaline environments. Verify the Moisture Content, which should strictly be below 6% to ensure a long shelf life and prevent microbial growth during storage.

Lysozyme is widely used as a Natural Preservative in the dairy industry (specifically to prevent 'late blowing' in hard cheeses caused by Clostridium tyrobutyricum). In the Wine Industry, it is used to control lactic acid bacteria. It also serves as a Bio-pharmaceutical ingredient in throat lozenges and eye drops due to its antibacterial and anti-inflammatory properties. Recently, it has gained traction in Animal Feed as an antibiotic substitute to enhance gut health in livestock.

Lysozyme is a bioactive protein sensitive to extreme temperatures. It must be shipped in cool, dry conditions (typically 2-8°C for long-term storage, though stable at room temperature for short durations). Ensure the supplier uses vacuum-sealed aluminum foil bags inside fiber drums to protect against moisture and UV light. For transoceanic shipping, specify reefer containers or air freight to minimize the risk of enzymatic degradation.

To ensure transaction security, prioritize suppliers on Made-in-China.com who have undergone Audited Supplier status. Use Secured Payment services to ensure funds are only released upon proof of shipping. Always request a Pre-shipment Inspection (PSI) by a third party like SGS or Intertek to verify that the enzymatic activity levels match the contract specifications before the balance payment is made.

Focus on Tiered Pricing based on activity units rather than just weight. Negotiate for a Long-term Supply Agreement if you have consistent demand, as this can secure a 10-15% discount compared to spot market prices. Additionally, negotiate the Lead Time; since high-activity enzymes have a specific shelf life, request 'Fresh Batch' guarantees to ensure the product you receive has at least 80% of its shelf life remaining upon arrival.

Lysozyme may be subject to Quarantine Inspections because it is derived from animal products (eggs). Ensure the supplier provides a Health Certificate and a Non-GMO Declaration. Check the HS Code (typically 350790) for specific tariff rates in your country. Failure to provide a BSE/TSE Free Certificate can lead to significant delays or rejection at customs in regions like the EU or North America.