层-层交替涂膜在鸡蛋保鲜中的应用  

Application of layer-by-layer alternating coating in egg preservation

作　　者：于泽东 王晶 任丹 吴习宇[1,2] 徐丹[1,2] YU Zedong;WANG Jing;REN Dan;WU Xiyu;XU Dan(College of Food Science,Southwest University,Chongqing 400715,China;Food Storage and Logistics Research Center,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学食品科学学院,重庆400715 [2]西南大学食品贮藏与物流研究中心,重庆400715

出　　处：《食品与发酵工业》2023年第8期223-229,共7页Food and Fermentation Industries

基　　金：西南大学博士基金项目(swu118083)。

摘　　要：该研究使用壳聚糖(chitosan,CS)和羧甲基纤维素钠(sodium carboxymethyl cellulose,CMC)对鸡蛋进行层-层交替涂膜,探究了涂膜次数、涂膜厚度和形貌对鸡蛋贮藏品质的影响。实验分别测定了交替涂膜2、4、6次后的鸡蛋和对照组在贮藏期间的品质变化、涂膜厚度和形貌变化。结果显示,交替涂膜4次后的鸡蛋(CS/CMC-4)涂膜层最厚,约为1.5~1.8μm,且可稳定地附着在蛋壳表面。CS/CMC-4的感官评级在贮藏49 d后才出现下降,且保持了较为稳定的蛋清pH和显著高于其余组的哈氏单位和蛋黄指数。与对照组相比,CS/CMC-4在室温下的货架期延长了至少39 d。而经6次和2次涂膜的鸡蛋因涂膜结构不均匀或厚度较小,贮藏品质的下降速度高于CS/CMC-4,货架期相较于对照组分别延长了约24 d和16 d。因此,采用层-层交替涂膜可优化涂膜的厚度和稳定性,从而显著提高涂膜对鸡蛋的贮藏保鲜效果,在鸡蛋保鲜中具有良好的应用前景。In this paper,chitosan(CS)and sodium carboxymethyl cellulose(CMC)were used to coat eggs layer-by-layer alternately,and the influences of coating times,coating thickness,and morphology on the storage quality of eggs were investigated.The changes in quality,thickness,and morphology of eggs and the control group were measured after 2,4,and 6 times of alternating coating during storage.Results showed that the coating film on eggs with alternating coating 4 times(CS/CMC-4)had a maximum thickness of about 1.5-1.8μm,which was stably attached to the eggshell surface.The sensory rating of CS/CMC-4 decreased after 49 days of storage and maintained a relatively stable egg white pH,as well as significantly higher values of Haugh unit and egg yolk index compared to other groups.Compared with the control group,the shelf life of CS/CMC-4 at room temperature was prolonged by at least 39 days.The storage quality of eggs coated 6 times and 2 times declined at a faster rate compared with that of CS/CMC-4 due to the uneven coating structure or smaller thickness,and the shelf life was prolonged by about 24 days and 16 days,respectively.Therefore,the application of layer-by-layer alternating coating could optimize the thickness and stability of the coating to significantly improve the storage and preservation effect of the coating on eggs and has a good application prospect in egg preservation.

关 键 词：交替涂膜 涂膜厚度 微观形貌 鸡蛋 贮藏品质 

分 类 号：TS253.4[轻工技术与工程—农产品加工及贮藏工程]