Abstract:

In order to select suitable modified atmosphere packaging (MAP) films for storage of green soybean, the effects
of micro-perforated plastic film and polyethylene (PE) bags with different thicknesses on physiological properties and
quality of green soybean during cold storage at (0.0 ± 0.2) ℃ were investigated. The results showed that PE film had better
preservative effect on green soybean than micro-perforated film; the equilibrium content of O2 was 16%–17.5%, whereas the
equilibrium content of CO2 was 4.3%–5.8%, which effectively suppressed respiration, delayed the incidence of mould decay,
reduced the rate of weight loss, slowed down the decline in chlorophyll content, and maintained the original moisture content
and original color of green soybean. The treatments with 0.03-mm PE and 0.05-mm PE packaging films could extend the
storage life of green soybean up to 50 days. Compared with the micro-perforated plastic film, PE film package could reduce
the rotting rate of green soybeans by 11%. In summary, 0.03-mm PE had the better effect on maintaining the quality of green
soybean during cold storage, and was thus suitable for storage of green soybean.

Key words: green soybean, modified atmosphere packaging, packaging material, storage