China cold storage solution provider
Fresh edamame pods are highly valued for their delicious taste, rich plant-based protein, vitamins, and essential minerals such as iron and phosphorus. These nutrients not only make edamame a healthy snack but also help reduce cholesterol levels, making it popular among health-conscious consumers worldwide.
❌ Chilling injury below 8°C (46°F): Brown rust spots
❌ Mold growth above 8°C: Spoils within 4-5 hours at room temperature
❌ Nutrient loss during conventional storage
To maintain quality for extended periods, commercial cold storage facilities use two main preservation methods.
1.Controlled Atmosphere (CA) Storage (2-Month Freshness)
Step-by-Step Protocol:
1.1Pre-Storage Prep
- Sanitize storage rooms (FDA-grade disinfectants)
- Calibrate gas monitoring systems
1.2Harvest & Pre-cooling
- Harvest at dawn; field heat removal within 2h
- Hydro-cool to 10°C (50°F)
1.3Gas Treatment
- Pack in 0.03mm LDPE bags (oxygen permeability: 4,000-6,000 cm³/m²/24h)
- Inject gas mix: O₂:4-6% | CO₂:5-7%
1.4Cold Storage
- Store at -2°C±0.5°C (28.4°F)
- Phase gas adjustment:
- Weeks 1-4: O₂ 4% / CO₂ 7%
- Weeks 5-8: O₂ 6% / CO₂ 5%
Results: 95% freshness retention for 60 days
2. Individually Quick Frozen (IQF) Technology (24-Month Shelf Life)
Commercial-Grade Process:
| Step | Key Parameters | Equipment |
|---|---|---|
| Washing | Chlorinated water (5ppm, pH6.5-7.5) | Bubble washer |
| Blanching | 98°C (208°F), 90 sec + 0.5% salt solution | Steam blancher |
| Cooling | 3-stage chilled water (10°C/50°F final) | Hydro-cooler tunnel |
| IQF Freezing | -35°C (-31°F), 8-12 m/min airflow | Fluidized bed freezer |
| Packaging | Nitrogen-flushed PE/PA bags | Automatic weigher-sealer |
| Storage | -18°C±1°C (-0.4°F), RH<85% | Pallet-ready cold rooms |
Conclusion
By implementing controlled atmosphere storage for short-term needs and quick-freezing technology for long-term preservation, food processors and distributors can ensure edamame stays fresh, green, and market-ready for up to two years.