*2.2. Treatment of Cowpeas*

Based on our previous study, dipping solutions were prepared as follows: pullulan was dissolved in purified water to obtain a solution with a concentration of 1% (*w*/*v*) to which 0.2% (*w*/*v*) E-polylysine and 0.3% (*w*/*v*) glutathione were added. The cowpeas were soaked in the dipping solutions for 15 min at 4 ◦C, rinsed, drained naturally, sealed in 25 cm × 38 cm × 0.03 cm polyethylene fresh-keeping bags and placed on racks at −4 ◦C for 15 days in cold storage. Cowpeas without any treatment were used as a control.
