In this study,intelligent,pH-responsive colorimetric films were prepared by encapsulating anthocyanins in nanocomplexes prepared from glutenin and carboxymethyl chitosan.These nanocomplexes were added to a corn starch...In this study,intelligent,pH-responsive colorimetric films were prepared by encapsulating anthocyanins in nanocomplexes prepared from glutenin and carboxymethyl chitosan.These nanocomplexes were added to a corn starch matrix and used in the freshness monitoring of chilled pork.The effects of anthocyanin-loaded nanocomplexes on the physical,structural,and functional characteristics of the films were investigated.The addition of anthocyanin-loaded nanocomplexes increased the tensile strength,elongation at break,hydrophobicity,and light transmittance of the films while decreasing their water vapor permeability.This is because new hydrogen bonds are formed between the film components,resulting in a more homogeneous and dense structure.The colorimetric film has a significant color response to pH changes.These films were used in experiments on the freshness of chilled pork,in which the pH changes with changing freshness states.The results show that the colorimetric film can monitor changes in the freshness of chilled pork in real time,where orange,pink,and green represent the fresh,secondary fresh,and putrefied states of pork,respectively.Therefore,the intelligent colorimetric film developed in this study has good application potential in the food industry.展开更多
以壳聚糖(chitosan,CS)、海藻酸钠(sodium alginate,SA)为成膜基材,通过添加黑苹果果皮花青素(black apple peel anthocyanin,BAA)提取物制备智能指示膜(CS-SA-BAA薄膜),并将其应用于虾新鲜度监测。分析比较BAA提取物添加量对复合薄膜...以壳聚糖(chitosan,CS)、海藻酸钠(sodium alginate,SA)为成膜基材,通过添加黑苹果果皮花青素(black apple peel anthocyanin,BAA)提取物制备智能指示膜(CS-SA-BAA薄膜),并将其应用于虾新鲜度监测。分析比较BAA提取物添加量对复合薄膜微观形貌、厚度、颜色、机械性能、水分质量分数、紫外线透过率等的影响;并进一步研究利用复合薄膜监测虾新鲜度的可行性。结果表明:添加BAA提取物到复合薄膜中使组分之间发生了相互作用,BAA提取物在复合薄膜中分散良好,且复合薄膜机械性能得到显著提升,水分质量分数和紫外线透过率下降。此外,BAA提取物在pH 1~14范围内颜色由红色变为黄色,对酸碱度有明显响应,含有15%BAA提取物的复合薄膜对pH值敏感,可将其应用于虾新鲜度指示。在4℃下贮藏的第5天,虾的总挥发性盐基氮含量和pH值超过了虾的腐败阈值,表明虾已经腐败,同时复合薄膜的颜色由最初的红色变为深灰色。因此,CS-SA复合膜可作为良好的载体固定BAA以制备智能指示膜,用于虾新鲜度监测。展开更多
基金funded by the Hainan Provincial Natural Science Foundation of China[Grant Number 2019RC031]National Natural Science Foundation of China[Grant Number 31460407].
文摘In this study,intelligent,pH-responsive colorimetric films were prepared by encapsulating anthocyanins in nanocomplexes prepared from glutenin and carboxymethyl chitosan.These nanocomplexes were added to a corn starch matrix and used in the freshness monitoring of chilled pork.The effects of anthocyanin-loaded nanocomplexes on the physical,structural,and functional characteristics of the films were investigated.The addition of anthocyanin-loaded nanocomplexes increased the tensile strength,elongation at break,hydrophobicity,and light transmittance of the films while decreasing their water vapor permeability.This is because new hydrogen bonds are formed between the film components,resulting in a more homogeneous and dense structure.The colorimetric film has a significant color response to pH changes.These films were used in experiments on the freshness of chilled pork,in which the pH changes with changing freshness states.The results show that the colorimetric film can monitor changes in the freshness of chilled pork in real time,where orange,pink,and green represent the fresh,secondary fresh,and putrefied states of pork,respectively.Therefore,the intelligent colorimetric film developed in this study has good application potential in the food industry.
