To ensure the stability and effectiveness of fish peptone after opening, the following operational procedures (graded treatment) must be strictly followed:

1. Sealing and Packaging Specifications

Industrial-grade (Composite Paper Drum Packaging)

**Original Packaging Handling**: After removing the air from the bag, seal the opening with both a zip tie and rubber band in double layers. The outer paper barrel lid must be tightly twisted and sealed

**Packaging Requirements**: Distribute into HDPE sealed containers in quantities of 50-100g, with 5g desiccant (silica gel) per kg of peptone placed inside the containers

Reagent grade (glass bottle/aluminum foil bag)

Gas replacement: Immediately fill with nitrogen (replacement rate ≥95%) after opening, then screw the silicone gasket bottle cap tightly

Freezing and Aliquoting: For long-term storage, aliquot into cryovials (PP material) and freeze at -20°C

Usage Cycle and Quality Monitoring

Time Limitation

Industrial grade: The shelf life shortens to 6 months after opening (compared to 24 months for unopened)

Reagent grade: Optimal usage period of 3 months. Beyond this period, total nitrogen content must be tested

Special Scenario Handling

```High-frequency usage scenarios```

Adopt a dual-container strategy—store bulk packages in a desiccator and place small sealed containers (daily dosage, ≤100g) on the workbench

High humidity environment (rainy season):

Increase the desiccant dosage to 10g/kg and wrap the container with moisture-proof film