How Storage Conditions Affect Fresh Produce Quality & Export Shelf Life

Understanding Post-Harvest Respiration & Transpiration

Harvested fruits and vegetables remain living biological tissues. They continue to respire by consuming stored sugars and oxygen while emitting carbon dioxide, water vapor, and heat. The rate of respiration directly dictates the rate of senescence and deterioration.

Managing the cold chain alone is often insufficient for long-distance maritime export (e.g. shipping table grapes or mangos over 25–40 transit days). Storage conditions must be controlled across three critical vectors: Temperature, Relative Humidity (RH), and Atmosphere Composition (O₂/CO₂ balance).

1. Temperature Control & Chilling Injury Risks

Maintaining precise temperature set points prevents moisture loss and pathogen propagation (such as Botrytis cinerea in table grapes). However, tropical and sub-tropical fruits like mangos or bananas are susceptible to chilling injury when exposed to temperatures below their threshold (typically <12°C).

2. Relative Humidity & Dehydration Prevention

High relative humidity (90%–95%) is necessary to prevent weight loss and stem browning in table grapes. However, excessive moisture without gas permeability creates free water droplets, fueling mold spores. VAMSA's modified atmosphere liners incorporate passive moisture-balancing polymers to absorb excess moisture while maintaining high RH.

3. Modified Atmosphere Packaging (MAP) Liners

VAMSA Fresh Keeper MAP liners are specifically engineered with micro-porous permeability tuned for target produce respiration rates. By allowing O₂ concentrations to decrease to optimal levels (3%–5%) and CO₂ levels to modestly increase (5%–10%), the aging process is slowed dramatically.