跌落冲击对苹果呼吸速率的影响

目的研究亚临界载荷对苹果呼吸速率变化的影响机制。方法首先通过在跌落临界高度以下设置不同高度的苹果跌落实验;然后测量跌落后的苹果在密封容器内CO2和O2浓度的变化;最后根据实验数据得到跌落高度与苹果呼吸速率的关系。结果在亚临界高度下,苹果受到损伤冲击后的呼吸速率发生了较大变化。在相同的时间内,跌落高度越高,密闭容器中O2的含量越少,CO2的含量越多,呼吸速率越大。随着跌落高度的增加,氧气的减少率越来越大,二氧化碳的增加率也越来越大。在同一跌落高度下,随着时间的增加,苹果的呼吸速率逐渐减小,当达到一定时间后,呼吸速率趋于平稳。根据实验数据建立了亚临界载荷下呼吸速率与跌落高度和时间的数学模型。结论研究结果有助于果品缓冲包装的改进。

Effect of Drop Impact on the Respiratory Rate of Apples

The work aims to study the effect of subcritical loads on the change of respiratory rate of the apples. Firstly, the apple drop tests at different heights below the critical drop height were set up. Then, the change in the concentration of CO2 and O2 of the dropped apple in the airtight container was measured. Finally, the relationship between the drop height and the respiratory rate was obtained on the basis of the experimental data. The respiratory rate of the apple had changed greatly after the impact damage. The higher the drop height was, the less the O2 was, the more CO2 was in an airtight container and the greater the respiratory rate was in the same period of time. With the increase of drop height, the oxygen loss rate was becoming more and greater, and so was the carbon dioxide increase rate. With the increase of time, the apple''s respiratory rate gradually decreased at the same drop height, and then tended to be stable after a period of time. The mathematical model for the respiratory rate and the drop height and time under the subcritical load was established according to the experimental data. The research results are conducive to the improvement of the fruit cushion packaging.