Mangaraj S, Goswami T K, Panda D K
Agro Produce Processing Division, Central Institute of Agricultural Engineering, Bhopal, 462038 MP India.
Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur, 261302 India.
J Food Sci Technol. 2015 Sep;52(9):5456-69. doi: 10.1007/s13197-014-1682-2. Epub 2014 Dec 19.
High value fruits namely, apple (cv. Royal Delicious), guava (cv. Baruipur) and litchi (cv. Shahi) harvested at their commercial maturity were considered for MA packaging to enhance storage life. Polymeric films namely LDPE, BOPP, PVC, PVDC of different thickness were used for MA packaging study and various film characteristics such as gas transmission rates, water vapour transmission rate, clarity, strength and durability were evaluated. Mathematical model was developed based on Arrhenius type equation to predict gas transmission rate (GTR) and the developed model was found to be very good fit with the mean relative deviation modulus value quite less than 10 %. The GTR of the films increased with the increase in storage temperature and the magnitude of the increase varied with the film type and thickness. Regression models have been suitably developed to predict the oxygen transmission rate and carbon dioxide transmission rate of selected polymeric films and combined film laminates as a function of temperatures. Since, none of the individual films could meet the gas transmission requirements of MAP for selected fruits, two different films were tailored to form laminates that sufficed the requirements for prolonged storage with maintaining original quality.
选用商业成熟度时采收的高价值水果，即苹果（品种：皇家嘎啦）、番石榴（品种： Baruipur）和荔枝（品种：沙希）进行气调包装，以延长其贮藏寿命。采用不同厚度的低密度聚乙烯（LDPE）、双向拉伸聚丙烯（BOPP）、聚氯乙烯（PVC）、聚偏二氯乙烯（PVDC）等聚合物薄膜进行气调包装研究，并对气体透过率、水蒸气透过率、透明度、强度和耐久性等薄膜特性进行了评估。基于阿伦尼乌斯型方程建立了预测气体透过率（GTR）的数学模型，发现所建立的模型拟合效果很好，平均相对偏差模量值远小于10%。薄膜的气体透过率随贮藏温度的升高而增加，增加幅度随薄膜类型和厚度的不同而变化。已建立了合适的回归模型，以预测所选聚合物薄膜和复合薄膜层压板的氧气透过率和二氧化碳透过率随温度的变化。由于没有一种单一薄膜能够满足所选水果气调包装的气体透过要求，因此定制了两种不同的薄膜来形成层压板，以满足延长贮藏期并保持原有品质的要求。
