共查询到18条相似文献,搜索用时 203 毫秒
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由于采后旺盛的生理代谢, 新鲜水果和蔬菜会出现品质劣变, 采取有效的抗菌保鲜策略是果蔬采后贮藏过程亟待解决的问题。天然大分子壳聚糖作为果蔬的活性包装材料具有来源广泛、安全和可生物降解等优点。本文综述了近年来壳聚糖基涂层/膜用于果蔬保鲜包装的抗菌保鲜效果及其对果蔬品质的影响, 首先介绍了壳聚糖的来源及应用特点以及制备壳聚糖薄膜材料的常用方法, 然后综述了壳聚糖及其与其他生物活性材料复合使用在果蔬保鲜中的应用, 并总结了使用壳聚糖基涂层/膜保鲜对果蔬外观品质、营养品质、挥发性香气物质等方面的影响; 最后, 对壳聚糖在果蔬抑菌保鲜机制方面的研究进行归纳介绍, 以期为其未来发展和应用提供新的思路。 相似文献
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壳聚糖具有良好的生物相容性、可生物降解性、安全性、成膜性、抗菌性等,常用于果蔬保鲜。但由于机械性能和生物活性不足,为了增强其理化性能和生物活性,常添加生物聚合物、抗菌剂、抗氧化剂等功能成分以提高膜综合性能。综述了壳聚糖膜和壳聚糖/多糖、壳聚糖/蛋白质、壳聚糖/脂质、壳聚糖/抗菌剂、壳聚糖/抗氧化剂等壳聚糖基复合膜在果蔬保鲜中的应用进展,从壳聚糖的诱导活性、成膜特性和抗菌活性三个方面总结了壳聚糖膜的保鲜机理,分析了壳聚糖基复合膜目前在果蔬保鲜实际应用中存在的问题,并对未来发展方向进行了展望,以期为开发安全、高效、绿色、经济的壳聚糖基果蔬保鲜膜提供一定的理论指导。 相似文献
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壳聚糖及其应用研究进展 总被引:1,自引:0,他引:1
本文为壳聚糖在各方面的研究应用提供了基础知识及理论依据。综述了壳聚糖的结构、性质、提取方法及壳聚糖在医学领域、水处理方面和作为膜材料在果蔬、肉制品等方面的应用。同时对壳聚糖的应用前景进行了展望。结果壳聚糖独特的理化性质和生物特性使其作为优良的药物制剂辅料,在药物制剂中起着不可估量的作用。另外,壳聚糖良好的成膜性、黏性、抗菌性及成膜后适宜的阻隔性使其在果蔬、肉制品等保鲜领域的应用更为突出。结论壳聚糖是大多数研究应用领域中不可或缺的原材料。 相似文献
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壳聚糖成膜剂特性的研究 总被引:25,自引:0,他引:25
针对果蔬保鲜,系统地研究壳聚糖成膜剂的特性:包括粘度、透明度、凝胶特性和膜性能。结果表明:粘度与浓度、温度、pH值有关;适量的添加剂能提高透明度和凝胶强度,成膜介质和溶液的浓度影响膜性能。 相似文献
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壳聚糖衍生物膜性能对水果保鲜作用的影响 总被引:1,自引:0,他引:1
目前国内应用的保鲜膜主要有PVC、PE两种,不仅保鲜效果不佳,且或多或少危害人体健康。改性壳聚糖具有优异的成膜性、抗菌性、吸湿性,无毒,易降解,因此改性壳聚糖保鲜果蔬已引起越来越多国家研究机构的重视。首先制备壳聚糖(CTS)、壳聚糖/二甲基二烯丙基氯化铵(CTS-DMDAAC)、羧甲基壳聚糖(CMCTS)、壳聚糖/2,3-环氧丙基三甲基氯化铵(CTS-ETA)保鲜膜,对改性壳聚糖膜进行抗拉强度、吸湿性、水溶性的测试,然后对改性壳聚糖膜应用于保鲜杨梅进行了研究。结果表明:膜的抗拉强度由大到小的顺序为CTS>CTS-DMDAAC>CMCTS>CTS-ETA,CMCTS膜的吸湿性、水溶性最好。制膜法保鲜效果接近涂膜法。改性壳聚糖类保鲜杨梅的最佳浓度为1.5%CTS、1.5%CMCTS、0.2%CTS-DMDAAC、1%CTS-ETA;CTS-ETA保鲜效果最好,CTS保鲜效果最差。低温贮藏效果明显高于常温贮藏。 相似文献
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论述了甲壳素/壳聚糖的分布及性质,以及壳聚糖在果蔬贮藏和果汁澄清中的应用,壳聚糖作为一种新型澄清剂和保鲜剂具有广阔的应用前景。 相似文献
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ABSTRACT The inhibitory activity of chitosan-based edible coatings was assessed against 2 food pathogens ( Staphylococcus aureus and Listeria monocytogenes ) and 1 strain involved in food alteration ( Pseudomonas aeruginosa ) on model agar medium and on a real cheese food product. Colony counting and epifluorescence microscopy methods were conducted, and the results show a nonsignificant influence of the components of the food matrix in the protection of the microbial population against chitosan activity. Numeration on model agar medium showed 100% inhibition of the development of selected Gram-positive bacteria and 77% inhibition on Pseudomonas growth. Chitosan is thought to act through binding to the cytoplasmic membrane surface, and it is possible that the outer membrane protects the Gram-negative cells. Moreover, epifluorescence microscopic results showed a possible chitosan action during a short time duration on the synthesis of nucleic acids and especially on the relative proportion of RNA compared with DNA. This impact was followed by an adaptative mechanism of the cells. Edible chitosan coating could thus be used to increase the microbial lag phase while decreasing the maximum density of selected microorganisms and could have potential application for dairy products preservation. 相似文献
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采用环氧氯丙烷和聚乙烯亚胺对壳聚糖进行改性得到改性壳聚糖,并利用聚乙烯亚胺、壳聚糖和改性壳聚糖分别对大豆分离蛋白进行改性处理,共混浇铸制备大豆蛋白膜材料。探讨了不同改性处理对大豆蛋白膜微观结构、疏水性能、力学性能以及热稳定性的影响。结果表明:采用改性壳聚糖处理得到的大豆蛋白膜的结晶度增加,表面疏水性增强,力学性能提高,热稳定性提升。当改性壳聚糖添加量为5%(以大豆分离蛋白质量计)时,整体改性效果最优,此时大豆蛋白膜的表面疏水性增强了23.32%,力学强度提高了36.27%。 相似文献
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Recently, increasing attention has been paid to develop and test films with antimicrobial properties in order to improve food safety and shelf life. Active biomolecules such as chitosan and its derivatives have a significant role in food application area in view of recent outbreaks of contaminations associated with food products as well as growing concerns regarding the negative environmental impact of packaging materials currently in use. Chitosan has a great potential for a wide range of applications due to its biodegradability, biocompatibility, antimicrobial activity, non-toxicity and versatile chemical and physical properties. Thus, chitosan based films have proven to be very effective in food preservation. The presence of amino group in C2 position of chitosan provides major functionality towards biotechnological needs, particularly, in food applications. Chitosan based polymeric materials can be formed into fibers, films, gels, sponges, beads or even nanoparticles. Chitosan films have shown potential to be used as a packaging material for the quality preservation of a variety of food. Besides, chitosan has widely been used in antimicrobial films to provide edible protective coating, in dipping and spraying for the food products due to its antimicrobial properties. Chitosan has exhibited high antimicrobial activity against a wide variety of pathogenic and spoilage microorganisms, including fungi, and Gram-positive and Gram-negative bacteria. The present review aims to highlight various preparative methods and antimicrobial activity including the mechanism of the antimicrobial action of chitosan based films. The optimisation of the biocidic properties of these so called biocomposites films and role of biocatalysts in improvement of quality and shelf life of foods has been discussed. 相似文献