不同气调包装对菠菜冷藏保鲜效果的影响

冷藏条件下,为研究菠菜气调包装(MAP)的最佳气体比例,延长菠菜保质期,选用农大菠杂1号为试材,以高阻隔性聚丙烯/聚乙烯(BOPP/PE)复合膜为包装袋,测定5种不同气体比例下菠菜的失重率、维生素C含量、叶绿素含量、相对电导率等理化指标的变化,并对其进行感官评价。结果表明,初始气体O₂、CO₂、N₂的体积分数分别为10%,2%, 88%时,贮藏第18 d,菠菜的感官评价5.5分,高于其他组;失重率较低,为0.32%,电导率上升较慢,为10.25%。在贮藏期最长的18 d,MA4组菠菜维生素C含量为1.25 mg/100 g,叶绿素含量为445.70 mg/kg,营养成分含量仍然较高。结论:菠菜在低温贮藏时,因呼吸作用较强,适宜的贮藏条件为高浓度的氧气(5%~10%);低浓度的二氧化碳(2%~4%)。

The impact of different modified atmosphere packaging used in spinach on preservation effect in refrigerated condition

Under refrigerated condition,in order to study the optimal gas proportion of the spinach air conditioning packaging environment to extend the period of the spinach shelf life.This experiment chooses nongda bo's miscellaneous 1 as the test materials,with high barrier property of polypropylene film/PE,BOPP/PE) composite film for packaging materials,determination of 5 kinds of spinach weightlessness rate under different gas ratio, vitamin C content, chlorophyll content, relative electric conductivity and other physical and chemical indicators of change,and sensory evaluation.Results showed that the initial gas volume fraction of O₂,CO₂,N₂ were as follows:10%,2%,88%,storage to 18 th d,the sensory evaluation of spinach was 5.5 points higher than that of other groups.The weight loss rate was low,at 0.32%,and the conductivity increased slowly,to 10.25%. At the longest storage period,the total amount of vitamin C in the MA4 group was 1.25 mg/100 g,and the content of chlorophyll was 445.70 mg/kg,while the content of the nutrient content remained high. Conclusion:when the spinach was stored at low temperature,because of the strong respiration,the suitable storage condition was high concentration of oxygen(5%~10%) and low concentration of carbon dioxide(2%~4%).