For stabilizing and maintaining the shelf life of your Liquid Chymosin formulation, several factors should be considered, including the choice of stabilizers, preservatives, and proper buffer preparation. Here’s a comprehensive guide based on your current setup and additional recommendations:

1. Stabilization and Shelf Life of Liquid Chymosin

Enzyme Stability:

Temperature: Store the liquid chymosin at a low temperature (typically 4°C) to maintain enzyme activity. High temperatures can cause enzyme denaturation and loss of activity.

pH: Maintain the pH within the optimal range for chymosin activity (usually around pH 5-6). Extreme pH levels can inactivate the enzyme.

Light and Oxygen: Minimize exposure to light and oxygen as they can degrade the enzyme. Use opaque containers and ensure that the storage area is low in oxygen if possible.

Preservation:

Sodium Benzoate: This is a common preservative used to inhibit yeast and mold growth. It is effective in acidic environments, but its effectiveness at higher pH levels may be limited. Ensure it is used within regulatory limits.

Potassium Sorbate: This is effective against molds, yeasts, and some bacteria. It works well in acidic environments and is generally compatible with various formulations.

Propylene Glycol: This is often used as a solvent and can help stabilize certain ingredients. It is generally safe and effective but should be used according to recommended concentrations.

Lauryl Sulfate: This is primarily a surfactant and can help in emulsification but may not directly contribute to enzyme stability. Ensure that its concentration does not interfere with enzyme activity.

2. Recommendations for Your Formulation

(1) Formulation Steps:

Buffer Preparation:

Buffer Solutions: Use buffers that maintain the pH within the optimal range for chymosin. Common buffers include citrate, phosphate, or acetate buffers. The choice of buffer should align with the desired pH range and the compatibility with other ingredients.

Concentration: Ensure that the buffer concentration is sufficient to maintain the pH stability throughout the product’s shelf life.

Dissolution: Dissolve the chymosin enzyme in a suitable buffer to achieve the desired concentration (600 IMCU/ml). Ensure the enzyme is fully dissolved and evenly distributed.30KG rennet powder (20000IMCU/g), add 630KG sterile water to dissolve, then add 180KG NaCL to dissolve, then add 360KG glycerol and stir (or use propylene glycol) to prepare buffer solution, you can get 1200KG 600IMCU/mL rennet liquid, about 1000L (density about 1.2KG/L)

Preservatives: Add sodium benzoate and potassium sorbate to inhibit microbial growth. Ensure these are added at effective concentrations and mix thoroughly.

Solvent: Incorporate propylene glycol as a solvent if necessary, ensuring it is compatible with your other ingredients and does not affect enzyme stability.

Surfactant: If using lauryl sulfate, verify its concentration to avoid any potential interference with the enzyme.

(2) Quality Control:

Regular Testing: Periodically test enzyme activity, pH, and preservative efficacy throughout the product’s shelf life to ensure stability and effectiveness.

Packaging: Use appropriate packaging to minimize exposure to light and oxygen, which can degrade the enzyme.

(3) Regulatory Compliance:

Check Regulations: Ensure that all preservatives and ingredients comply with local and international regulations for food-grade applications.

(4) Additional Advice:

Stability Studies: Conduct stability studies under various conditions to determine the optimal storage conditions and shelf life for your formulation.

Compatibility Testing: Test the compatibility of all ingredients in your formulation to ensure there are no adverse interactions that could affect enzyme stability or activity.

YOTABIO can supply microbial origin and vegan plant source rennet, inquiry for chymosin and other types of cheese coagulation enzyme: sales@yotabio.cn or whatsapp +8618561278690.