新鲜番茄主动气调包装

Active modified atmosphere packaging for fresh tomato fruits

采用0.055mm厚的LDPE膜对番茄进行主动气调包装,混合气体组分为:5％O_2/0％CO_2/95％N_2。该初始气体环境是通过番茄的呼吸作用、气体对LDPE膜的渗透作用及大气三者间的动态平衡过程来保持的。采用动态平衡模型方程,通过研究不同温度(5℃、25℃)、包装内不同氧浓度(0％-21％)条件下的番茄呼吸速率、LDPE膜透气率,预测了包装量。结果表明:(1)温度升高,番茄呼吸耗氧率Ro_2增大的幅度比LDPE膜透氧率Po_2的增长幅度大;(2)包装内氧气浓度降低,呼吸作用的耗氧率Ro_2下降,而LDPE膜的透氧率线性上升;(3)包装袋内建立主动气调环境时,随着初始给定的氧浓度的增高,包装量要随之下降;贮藏温度越低,包装量越大。

Active modified atmosphere packaging for fresh tomato fruits was created using LDPE film with 0.055mm thickness. The gas mixture contained 5% O2/0% CO2/95% N2. In MAP, the initial modified atmosphere was maintained through the dynamic equilibrium interactions among the respiration of tomato fruits, the gas permeation of LDPE film and the atmosphere outside the packaging. Based on the dynamic equilibrium equations, packaging weights were predicted by studying the respiration rates of fresh tomato fruits and the permeability of LDPE film under the conditions of different temperatures ( 5 ℃ ,25℃) and different oxygen concentrations (0 % -21%) . The results showed that: (1) The respiration rates of fresh tomato fruits increased with the rise of temperature faster than that of the permeability of LDPE film. ( 2 ) Rates of O2 consumption decreased with the lowering oxygen concentration inside the packaging, while the permeability to O2 of LDPE increased approximately linearly. (3) To create an AMAP environment within a packaging, packaging weights decreased with the increasing of initial suggested oxygen concentrations, and the lower the storage temperature, the heavier the packaging weight.