转光薄膜对绿颜色蔬菜品质影响的研究

目的延长绿颜色蔬菜的货架寿命,保护绿色蔬菜品质。方法模拟某超市果蔬区的销售环境,以鲜切西兰花为例,选择单基双能转光剂(RBI),吹制添加质量分数为0.5%,0.8%,1.2%,1.5%,2.0%的低密度聚乙烯(LDPE)薄膜。对转光薄膜的气体透过性和光学性能进行测试,分别将添加不同含量单基双能转光剂的LDPE薄膜包装鲜切西兰花,并置于模拟超市的光照环境下,测定试验样品的质量、维生素C含量、叶绿素含量等变化,并对试验样品进行感官评价。结果对比超市现有绿颜色蔬菜的包装薄膜,在LDPE薄膜中添加适量转光剂可以达到保护鲜切西兰花品质、延长其货架寿命的效果。结论添加质量分数为1.2%单基双能转光剂的低密度聚乙烯薄膜的保鲜效果最好。

Effect of the Light Conversion Film on the Quality of Green Vegetable

The aim of this work was to extend the shelf life of green vegetable and protect the quality of green vegetable. In simulated environment of the fruit and vegetable sales area in a supermarket, with fresh-cut broccoli as an example, low-density polyethylene films with different mass fractions (0.5%, 0.8%, 1.2%, 1.5%, 2.0%) of the mono-matrix double-function light conversion agent RBI were prepared. The gas permeability and optical properties of the light conversion films were tested. The LDPE films with different mass fractions of the mono-matrix double-function light conversion agent RBI were used to package fresh-cut broccoli, which were placed in a simulated supermarket lighting environment. The weight loss, and the change of vitamin c and chlorophyll contents in the samples were determined, and sensory evaluation was conducted for the samples. Compared with the existing green vegetable packaging film in the supermarket, LDPE film supplemented with a certain amount of light conversion agent could protect the quality of fresh-cut broccoli and prolong its shelf life. The low-density polyethylene films supplemented with 1.2% mono-matrix double-function light conversion agent had the best preservation effect.