Research on SO<sub>2</sub> Controlled Release Packaging on the Preservation Performance of ‘Kyoho’ Grapes

With the purpose of extending the shelf-life of Kyoho grapes at room temperature (23±1°C), we investigated the effects of two kinds of preservation packaging on Kyoho grapes’ shelf-life: SO 2 controlled release packaging (A bag) and A with 1-MCP packaging (A-1-MCP bag), the grapes naked and packaged with LDPE as the control groups. During the experiment, the headspace concentrations, appearance quality, water loss, stem browning, solidity, TSS and TA were tested and analyzed every two days. The experimental results showed that A bags could form a suitable modified atmosphere packaging (MAP) environment and prohibit the growth of pathogenic bacteria of grapes. After 8 days’ storage, the grapes naked and packaged with ordinary LDPE groups had serious stem browning and rot rate. The stem browning index of the grapes packaged with A bags and A-1-MCP bags were level 1 and level 0. And the rot rate was 3.63% and 1.26%, respectively. The appearance and flavor of the Kyoho grapes had commercial values, the preservation effects were apparent.