明胶/紫甘蓝花青素/纳米二氧化钛指示膜的制备及其在鲜虾保鲜中的应用  

Gelatin/Purple Cabbage Anthocyanin/Nanometer Titanium Dioxide Indicator Films:Preparation and Application in Fresh Shrimp Preservation

作　　者：王一帆 刘英健 玉万国[1] 刘云芬 殷菲胧 宋慕波 WANG Yifan;LIU Yingjian;YU Wanguo;LIU Yunfen;YIN Feiong;SONG Mubo(College of Biological and Chemical Engineering,Guangxi University of Science and Technology,Liuzhou 545005,Guangxi,China;Institute of Food Science and Engineering Technology,Hezhou University,)

机构地区：[1]广西科技大学生物与化学工程学院,广西柳州545005 [2]贺州学院食品科学与工程技术研究院,广西贺州542899

出　　处：《食品研究与开发》2024年第11期115-124,共10页Food Research and Development

基　　金：国家自然科学基金项目(31801607);广西自然科学基金项目(2022AC21065、2020GXNSFAA259087)。

摘　　要：以明胶为成膜基材,以紫甘蓝花青素和纳米二氧化钛(titanium oxide,TiO_(2))为新鲜度指示剂和屏蔽紫外防护剂,采用溶液浇铸法制备智能指示膜表征不同含量纳米TiO_(2)对指示膜物理性能、光照稳定性和机械性能的影响。结果表明:TiO_(2)的引入能够明显提高指示膜的光照稳定性,改善指示膜的力学性能和水蒸汽阻隔性,当TiO_(2)添加量为1.0%时,指示膜断裂伸长率为21.55%,拉伸强度为22.73 MPa,,水蒸气透过系数为3.885 g/(m·s·Pa),光照稳定性强,指示膜的综合性能最好。傅里叶变换红外光谱和扫描电子显微镜结果表明,明胶、花青素以及TiO_(2)之间形成新的氢键,指示膜的网络结构变得更加致密。此外,将综合性能最优的指示膜应用于虾(4℃)新鲜度监测,在试验期间指示膜产生明显的颜色变化,并对应鲜度等级划分,相关性分析表明指示膜色差值(ΔE)与挥发性盐基氮(total volatile basic nitrogen,TVB-N)含量存在显著正相关(R^(2)=0.913 3),表明指示膜能够对鲜虾的新鲜度进行可视化实时监测。Smart indicator films were prepared by the solution casting method with gelatin as the film-forming substrate,purple cabbage anthocyanin as the freshness indicator,and nano-titanium oxide(TiO_(2))as the ultra-violet(UV)protective agent.The effects of different content of nano-TiO_(2) on the physical properties,light sta-bility,and mechanical properties of the indicator films were characterized.The results showed that the intro-duction of TiO_(2) improved the light stability,mechanical properties,and water vapor permeability of the film.The film prepared with the TiO_(2) addition at 1%showed the elongation at break of 21.55%,the tensile strength of 22.73 MPa,the water vapor transmission coefficient of 3.885 g/(m·s·Pa),and strong light stability,dem-onstrating the best overall performance.The results of Fourier transform infrared spectroscopy and scanning electron microscopy showed that new hydrogen bonds were formed between gelatin,anthocyanin,and TiO2.Accordingly,the network structure of the film became denser.In addition,the indicator film with the best overall performance was employed to monitor the freshness of shrimp(4℃),which showed obvious color changes during the experimental period.The freshness was graded based on the color changes.The correlation analysis showed a significantly positive correlation between the color difference(ΔE)of the indicator film and the content of total volatile basic nitrogen(R^(2)=0.9133),indicating that the indicator film enabled the visual monitoring of the freshness of fresh shrimp in real time.

关 键 词：紫甘蓝花青素 纳米二氧化钛 智能指示膜 鲜虾新鲜度 可视化监测 

分 类 号：TS254.4[轻工技术与工程—水产品加工及贮藏工程] TS206.4[轻工技术与工程—食品科学与工程]