Effects of low-density polyethylene (LDPE) packaging and nano-structured silverpolyethylene (PE/Ag2O) packaging on the overall sensory quality, color, weight and solute loss of fresh-cut apples stored at 5 and 15C were studied in this research. Results showed that, compared with normal LDPE packaging, the PE/Ag2O packaging helped to maintain the freshness of apple slices. Nano-structured PE/Ag2O bag delayed apple browning and decreased the weight loss of apple slices during storage. In addition, it can also prevent apple slices from microbial spoilage. As a result, the quality of apple slices saved at 5C in PE/Ag2O bag was acceptable in 12 days, while those held in LDPE bag showed some deterioration in 6 days. Furthermore, considering the potential health risk resulting from silver leak, the safety of PE/Ag2O bag was evaluated, and the result indicated an acceptable safety for food packaging. PRACTICAL APPLICATIONSTypes of nano-structured bags are recently commercialized for food packaging in many countries, but few documents report their performance in quality maintenance. This study indicates that nano-structured PE/Ag2O bag is effective in maintaining the freshness of apple slices with extended shelf-life. Results of this work may be useful for promoting the acceptance and application of similar nano-packaging in the quality maintenance of fresh-cut products.
The Mg-Zn-Zr alloy ZK60 with added trace rare-earth elements Y(0.9wt%) and Ce(0.9wt%) were prepared. After hot extrusion and aging treatment, the tensile mechanical properties of the alloys were tested at room temperature. Microstructures of the alloys were investigated by optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The existing form, affecting mechanisms of trace Y and Ce in alloys and the effects on the microstructures and mechanical properties of ZK60 alloy were discussed. The results showed that: trace rare-earth elements Y and Ce both had remarkable grain-refining effects on the alloys, while the grain-refining effect of Y was more significant than that of Ce. RE elements Y and Ce improved the mechanical properties of the ZK60 alloy, but the strengthening effect of Y was more remarkable. It was found that σb of Mg-Zn-Zr-Y alloy was improved by 12.6%. Addition of Ce to the ZK60 alloy led to an increase in ductility of the alloy from 15% to 17%.
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