| 摘要: |
| 本文针对风冷冰箱中冷冻猪肉品质下降的问题，提出了一个操作简单方便、效果良好的解决措施：抽气贴体包装（包装袋内留有5%~8%空气，包装袋与肉贴合）。通过实验测定了不包装、密封包装、抽气贴体包装的冷冻猪肉干耗率、解冻汁液流失率、色差、质构特性、剪切力、微观结构等指标，研究了不同包装方式对冷冻猪肉品质的影响。研究发现：不包装的干耗率、L*值、b*值显著大于密封包装和抽气贴体包装，解冻汁液流失率、a*值、质构特性、剪切力显著低于密封包装和抽气贴体包装，微观结构的完整性受到破坏的程度严重，肌纤维断裂，呈无序性排列；抽气贴体包装的干耗率在60 d后显著小于密封包装，解冻汁液流失率、色差、质构特性、剪切力均优于密封包装，微观结构的完整性更好。结果表明密封包装和抽气贴体包装可以有效地维持冻肉品质，抽气贴体包装的效果优于密封包装，更具有可行性。 |
| 关键词: 冷冻猪肉 包装方式 冻肉品质 风冷冰箱 干耗 |
| DOI： |
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| 基金项目:“十二五”国家科技支撑计划项目（2013BAD19B01）。 |
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| Effects of Different Packaging on the Quality of Frozen Pork in Frost-free Refrigerator |
| Li Xianming,Liu Baolin,Li Weijie,Song Xiaoyan |
| (University of Shanghai for Science and Technology) |
| Abstract: |
| Frost-free refrigerator is becoming more and more popular in the market. But the quality of frozen pork stored in the frost-free refrigerator decreased obviously with time. In this paper, the effect of three packaging types (no packaging，sealed packaging and air free packaging) on the quality of frozen pork was studied to find a effective and convenient method to maintain its quality. Weight loss rate, dripping loss rate, color-difference, texture, shear force and microstructure of frozen pork were taken as the factors to evaluate the effectiveness of packaging. The results showed that weight loss rate, L* value and b* value of the control group were significantly higher than that of sealed packaging and air free packaging. Dripping loss rate, a* value, texture, and shear force of the control group was significantly lower than that of sealed packaging and air free packaging. The microstructure of the control group was severely damaged with muscle fiber broken. After 60 days, weight loss rate of air free packaging was significantly smaller than that of sealed packaging. There were no significant differences in dripping loss rate, color-difference, texture and shear force between air free packaging and sealed packaging. The results of this study proved that the sealed packaging and air free packaging are feasible to maintain the quality of frozen pork, while air free packaging is better than that of sealed packaging, especially for long-term storage. |
| Key words: frost-free refrigerator frozen pork packaging quality weight loss |
