纳米Fe^(3+)/TiO_2改性聚乙烯醇基紫胶复合膜对鸡蛋的保鲜效果  

Preserved effect of nano-Fe^(3+)/TiO_2 modified PVA-based composite preservation coating for eggs

作　　者：龙门[1,2] 马磊[1] 宋野[1] 顾凤兰[1] 黄明明[1] 章建浩[1] 

机构地区：[1]国家肉品质量与安全控制工程技术研究中心,农业部畜产品加工与质量控制重点开放实验室,食品安全与营养协同创新中心,南京农业大学食品科技学院,南京210095 [2]滁州学院生物与食品工程学院,滁州239000

出　　处：《农业工程学报》2014年第20期313-324,共12页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑计划课题动物源食品加工共性关键技术研究(2012BAD28B01);江苏省国际科技合作计划(BZ2014034);苏州市科技计划项目(ZXG2012033);常熟市人才计划项目(CSRC1131)

摘　　要：为了探究纳米Fe3+/TiO2改性聚乙烯醇基紫胶复合膜对清洁鸡蛋的保鲜效果,该文中将新鲜鸡蛋分组后涂上聚乙烯醇(polyvinyl alcohol)单膜和纳米Fe3+/TiO2改性聚乙烯醇基(polyvinyl alcohol)紫胶复合膜后,测定储藏过程中各组鸡蛋的感官品质、失重率、哈夫单位(haugh units,HU)、蛋黄指数、色差、pH值和菌落总数等,再对各项指标进行统计分析。结果表明:各组鸡蛋的品质指标在储藏过程中都有显著变化(P<0.05);贮藏过程中纳米Fe3+/TiO2改性聚乙烯醇基紫胶复合膜组的鸡蛋品质指标显著优于聚乙烯醇单膜组和未涂膜组(P<0.05),表明复合膜对鸡蛋的保鲜效果优于聚乙烯醇(polyvinyl alcohol)单膜和未涂膜。未处理的和清洗消毒过的,聚乙烯醇基单膜涂膜包装后的,和纳米Fe3+/TiO2改性聚乙烯醇基紫胶复合膜涂膜包装后的清洁鸡蛋,其保质期分别为20~30、50~60和70~80 d,表明聚乙烯醇单膜可延长鸡蛋保质期30 d左右而复合膜可延长达50 d左右;该研究结果为纳米改性复合涂膜材料在新鲜鸡蛋贮藏保鲜上的应用提供参考。Eggs are highly nutritional food, and contain a variety of amino acids, proteins, minerals, lecithin, sterols, and other essential nutrients that can be fully absorbed by human body. However, the quality of unsterilized and unwashed eggs will deteriorate rapidly during storage, including such conditions as water evaporation, weight loss, and yolk coefficient decrease. In such cases, cleaned and sterilized eggs can effectively suppress harmful pathogens and extend the shelf life of egg products. But cleansing and sterilization could possibly destroy the outer shell membrane of eggs, which causes the eggs to be vulnerable to microbial contamination, as the outer shell membrane has been destroyed. The outer shell membrane can prevent microbial invasion of eggs, so the destruction of the outer shell membrane makes water evaporate through the pores of the shell membrane, and finally causes the spoilage of fresh eggs. Therefore, one of the most effective ways of keeping eggs fresh is to coat eggs with an antimicrobial film. In this paper, polyvinyl alcohol/shellac/ nano-Fe3＋/TiO2 composite film prepared by the author is used to preserve eggs by fully covering them. The composite film materials include nano-Fe3＋/TiO2which is fabricated by blending nano-Fe3＋ with nano-TiO2in a solution and then calcining them at 400℃ for 3 hours, PVA （polyvinyl alcohol）, and shellac. For antimicrobial film preparation, the first step is preparing the coating film solution by slowly dissolving 5 g/mL PVA in distilled water while stirring and then heating the coating film solutions up to 85°C. The second step is incorporating nano-Fe3＋/TiO2, which is dissolved in anhydrous ethanol, into the coating film solution and then shocking composite film solutions with ultrasonic at 65 W/L for 15 min in an ultrasonic bath. The third step is incorporating succinylated monoglycerides and shellac, which are dissolved in anhydrous ethanol into PVA/nano-Fe3＋/TiO2 composite film solutions, while stirring and then cooling the solution to 6

关 键 词：贮藏 复合材料 品质控制 纳米Fe3+/TiO2 紫胶 聚乙烯醇 涂膜保鲜 贮藏期 

分 类 号：TS206.4[轻工技术与工程—食品科学]