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Chitosan extends the shelf-life of filleted tilapia (Oreochromis niloticus) during refrigerated storage 总被引:1,自引:0,他引:1
Shelf-life extension of aquatic products is of significant economical importance. To determine the potential effect of chitosan on the shelf-life of filleted tilapia, this study analyzed the bacterial community diversity in fresh and spoiled tilapia fillets stored at (4 ± 1)℃ and examined the antimicrobial activity of chitosan against relevant bacteria isolates. Results showed that Pseudomonas (20%) and Aeromonas (16%) were abundant in fresh tilapia fillets, whereas Pseudomonas (52%), Aeromonas (32%) and Staphylococcus (12%) were dominant in the spoiled samples. Chitosan showed wide-spectrum antibacterial activity against bacteria isolated from tilapia and 5.0 g L-1 chitosan was selected for application in preservation. We further determined the shelf-life of chitosan-treated, filleted tilapia stored at (4 ± 1)℃ based on microbiological, biochemical and sensory analyses. Results showed that the shelf-life of chitosan-treated, filleted tilapia was extended to 12 d, whereas that of untreated, control samples was 6 d. These indicate that chitosan, as a natural preservative, has great application potential in the shelf-life extension of tilapia fillets. 相似文献
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This paper studies the magnetic hysteresis and refrigeration capacity of Ni--Mn--Ga alloys in detail during heating and cooling isothermal magnetisation processes. The Ni--Mn--Ga alloys show larger magnetic hysteresis when they transform from austenite to martensite, but smaller magnetic hysteresis when they transform from martensite to austenite. This behaviour is independent of either the pure Ni--Mn--Ga alloys or the alloys doped with other elements. Because of the existence of the magnetic hysteresis, the relation between the magnetic entropy change and refrigeration capacity is not simply linear. For practical consideration, magnetocaloric effect of Ni--Mn--Ga alloys should be investigated both on cooling and heating processes. 相似文献
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建立氯化钙—氨吸附式制冷单管吸附床传热传质模型 ,采用数值方法对该模型进行了求解 ,得出不同工况下的温度场 ,讨论了吸附床的有效导热系数、接触热阻、流体传热系数等对解吸量及制冷功率的影响。结果表明 ,提高吸附床导热有效导热系数 ,减小接触热阻可有效地改善吸附床的性能 ,为吸附床的优化设计提供了依据 相似文献
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J. M. Anderson 《Geotechnical and Geological Engineering》1988,6(1):41-61
Summary This paper examines the methods presently available to apply refrigeration to a longwall district of a coal mine with particular reference to both the sources of heat and humidity around a district, and the specific locations which require cooling. Other methods to improve climatic conditions are also investigated and computer-predicted results from a district temperature prediction program are used for discussion.An approach to the solution of a climatic problem is explained with reference to other coal mine contaminants and an environmental design philosophy for deep high production districts in British coal mines is described. 相似文献
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新型电致冷半导体探测器的应用 总被引:1,自引:0,他引:1
用于探测X射线的锂漂移型硅探测器需在液氮条件下低温保存和使用,因此限制了其应用范围.介绍了一种采用电致冷方式的新型半导体探测器,并通过把液氮致冷的Si(Li)探测器与电致冷的Si-PIN探测器进行比较,论证了电致冷方法的可行性. 相似文献