壳聚糖浓度对原位合成纳米SiOx壳聚糖涂膜性能的影响  

Effect of Chitosan Concentration on the Properties of the in-situ Nano SiOx Chitosan Coatings

作　　者：杨丽丽 郝晗 张璇 孙彤 Yang Lili;Hao Han;Zhang Xuan;Sun Tong(Food Safety Key Labof Liaoning Province,Jinzhou 121013,Liaoning;National & Local Joint Engineering Research Center of Storage,Processing and SafetyControl Technology for Fresh Agricultural and Aquatic Products, Jinzhou 121013,Liaoning;Hebei Huaqing Environmental Science and Technology Co.,Ltd,Shijiazhuang 050081)

机构地区：[1]渤海大学食品科学与工程学院辽宁省食品安全重点实验室,辽宁锦州121013 [2]生鲜农产品贮藏加工及安全控制技术国家地方联合工程研究中心,辽宁锦州121013 [3]河北华清环境科技有限公司,石家庄050081

出　　处：《中国食品学报》2019年第5期85-92,共8页Journal of Chinese Institute Of Food Science and Technology

基　　金：国家自然科学基金项目(31371850);国家重点研发计划课题(2016YFD0400805)

摘　　要：在不同壳聚糖浓度条件下制备原位合成纳米SiOx壳聚糖涂膜,对其进行XRD、FT-IR、SEM、TEM表征分析,研究壳聚糖浓度对复合涂膜透气性、力学性能及其保鲜性能的影响。研究结果表明,涂膜的微观结构与壳聚糖浓度有关。原位合成的纳米SiOx与壳聚糖间形成化学键力的结合,当壳聚糖质量浓度为1.5 g/100 mL时,壳聚糖流延成膜失水均匀,原位合成的纳米SiOx粒子多为8～15 nm的颗粒,呈链状链接,基本无团聚,分散状态良好,涂膜均匀、致密,其断面的大孔隙结构减少,基本无小裂纹。随着壳聚糖浓度的增加,涂膜的水蒸气透过率、透CO_2性和透O_2性均降低,同时其拉伸强度提高,断裂伸长率下降。在4℃条件下用不同浓度的壳聚糖涂膜,对美国红鱼的保鲜试验结果表明,随着贮藏时间的延长,美国红鱼的鲜度指标下降。壳聚糖涂膜延缓了美国红鱼的品质下降,其中,壳聚糖质量浓度为1.5 g/mL时,其保鲜性能最优。The nano in-situ SiOx chitosan coatings were prepared from the various concentration of chitosan,and then characterized by XRD,FT-IR,SEM,and TEM.The effect of the chitosan concentration on the gas permeabilities,mechanical properties,preservation properties of the coatings was studied.The results show that the microstructure of the coating is affected by the concentration of the chitosan.Chemical bonds were formed between nano in-situ SiOx and chitosan.When the concentration of chitosan was 1.5 g/100 mL,the dehydration from chitosan coating is uniform in the process of flowing spread molding.The size of the nano in-situ SiOx is 8-15 nm,linked as chain,nearly no reunion and well dispersed.The coating is uniform,compact,and the large pores decreases and nearly no crack on the sections.With the increase of the concentration of the chitosan,the permeabilities of water vapor,CO2 and O2 are all increased,while the tensile strength enhances and the elongation at break decreases.The preservation results of the coatings with different chitosan concentrationon Sciaenops ocellatus at 4℃demonstrate that the freshness of Sciaenops ocellatus are reduced with the storage duration.Meanwhile,the chitosan coatings could delay to decline the quality of Sciaenops ocellatus,and the chitosan concentration of 1.5 g/mL is the optimal.

关 键 词：原位合成 纳米SIOX 壳聚糖 涂膜 性能 

分 类 号：TS202.3[轻工技术与工程—食品科学]