新型包装材料对甜玉米贮藏品质的影响

Effects of New Packaging Materials on the Storage Quality of Sweet Corn

甜玉米采后代谢旺盛,品质极易发生劣变,包装保鲜为最简单的解决方式。为明确包装材料对甜玉米贮藏品质的影响,以“BM380”甜玉米为试验材料,研究采用7种材料包装的甜玉米在2~5℃贮藏条件下的失重率、感官品质、可溶性糖含量和VC含量的变化,并以感官品质为最主要指标判断包装材料的保鲜效果。结果表明:在7种包装材料中,欧乐甜玉米保鲜袋在降低甜玉米失重率方面表现最优,在贮藏14 d时失重率仅0.746%;生物气调保鲜包装袋包装的甜玉米在超市冷链销售保鲜期最长,可达7d,比对照超市聚乙烯包装袋延长4d,贮藏16d时感官指数为3.01,仍具食用价值,其次是欧乐甜玉米保鲜袋包装,甜玉米超市冷链销售保鲜期为6 d,贮藏13 d时感官指数为4.33,仍具食用价值;复命锁鲜袋可以维持甜玉米的VC含量,贮藏12d的VC含量较对照显著提高46.8%,其次是欧乐甜玉米保鲜袋包装,贮藏12、15d分别较对照显著提高38.03%、11.32%;加厚(抗菌/保鲜)膜自制包装袋包装的甜玉米可溶性糖含量下降最缓慢,贮藏15 d的可溶性糖含量比对照显著提高73.11%,欧乐甜玉米保鲜袋包装较对照显著提高49.09%。可见,欧乐甜玉米保鲜袋可减缓甜玉米失重,生物气调保鲜包装袋的冷链保鲜期较长,复命锁鲜袋可维持甜玉米的VC含量,加厚(抗菌/保鲜)膜自制包装袋可保持甜玉米的可溶性糖含量。综合考虑失重率、感官指数及营养成分损失情况,建议选择欧乐甜玉米保鲜袋。

The metabolism of sweet corn is vigorous after harvest,and the quality of sweet corn is easy to deteriorate.Packaging to keeping fresh is the simplest way to solve the problem.In order to determine the effect of packaging materials on the storage quality of sweet corn,the changes of weight loss rate,sensory quality,soluble sugar content and VC content of sweet corn packaged with seven different materials at 2-5℃were studied taking sweet corn variety of'BM380'as experimental material,and the sensory quality was taken as the most important index to judge the preservation effect of packaging materials.The results showed that among the seven packaging materials,Oule sweet corn fresh-keeping bag had the best performance in reducing the weight loss rate of sweet corn,and the weight loss rate was only 0.746%after 14 days of storage.The bio-modified atmosphere fresh-keeping bags had the longest cold chain shelf life with seven days for sweet corn in supermarkets,which was four days longer than that of control(polyethylene package),still had edible value with the sensory index of 3.01 at 16 days of storage,and followed by Oule sweet corn fresh-keeping bags,which had cold chain shelf life with six days in supermarkets and still had edible value with the sensory index of 4.33 at 13 days of storage.Fuming freshkeeping bag could maintain VC content of sweet corn,which increased significantly by 46.8%after 12 days of storage compared with that of the control,followed by the Oule sweet corn fresh-keeping bags,which significantly increased by 38.03%,11.32%after 12,15 days of storage compared with that of the control,respectively.The soluble sugar content of sweet corn packaged self-made packaging bag with thickened(antibacterial/fresh-keeping)plastic wrap decreased most slowly,and the soluble sugar content of sweet corn stored for 15 days significantly increased by 73.11%compared with that of the control,while the soluble sugar content of sweet corn packaged with Oule sweet corn fresh-keeping bags increased significantly by 49.09%compared with that of the control.It could be seen that Oule sweet corn fresh-keeping bag could slow down the weightlessness of sweet corn,bio-modified atmosphere fresh-keeping bag had a long cold chain shelf life,Fuming fresh-keeping bag could maintain the VC content of sweet corn,and self-made packaging bag with thickened(antibacterial/fresh-keeping)plastic wrap could keep the soluble sugar content of sweet corn.Considering the weight loss rate,sensory index and nutrient loss,it was recommended to choose Oule sweet corn fresh-keeping bags.