The physical properties and thermal stability of gelatin/gum‐Arabic microcapsules loaded fish oil, developed by various encapsulation techniques such as directly spray‐dried microcapsule, complex coacervation microcapsule, and double‐encapsulated microcapsule (DEM) were investigated. All the particles dried by spray drying and evaluated by scanning electron microscopy (SEM), thermal analysis, cumulative release analysis, and rheological measurements. The external and internal core–shell structure of microcapsules observed by SEM, were beneficial to improving the thermal stability of particles. The DEM possessed stable two‐shell structure, and retained 25.39% weight after thermogravimetric analysis, 93.71% encapsulation efficiency only released 11.8% core material in 100 °C water bath over 30 min, which could perform more stable during processing, transportation, and consumption. Above all, these results could be the basis of selecting suitable encapsulation technique, processing temperature, and time control in practical production when functional microcapsules needed. Practical applications This article is aimed at characterize structures, relative physical properties and thermal stability of three types of microcapsules: directly spray‐dried microcapsules, complex coacervation microcapsules, and double‐encapsulated microcapsules, for encapsulating fish oil during processing and storage. Therefore, all the results such as encapsulation efficiency, loading capacity, surface oil, particle size, thermal stability, and fish oil cumulative release percentage of microcapsules at certain temperature could be used as guidance on practical functional foods production like selecting a suitable encapsulation approach, processing temperature, or time control.
The effects of curdlan (2%, 3% and 4%) on the gel properties of Alaska surimi using high-temperature treatment were examined in this study. Curdlan treatment improved the gel strength of surimi in a concentration-dependent manner. Based on the results of dynamic rheology and differential scanning calorimetry (DSC), curdlan promoted the stability of proteins in the gel. Moreover, curdlan facilitated the interaction between gel proteins and actomyosin, thereby preventing the aggregation and denaturation of protein and increased the thermal transition temperature. The results of scanning electron microscopy showed that the addition of curdlan induced the formation of a more ordered and denser gel matrix and the fibrils in the three-dimensional network became more delicate. Therefore, surimi samples with curdlan may hold more moisture and exhibit improved transfer of free water to bound water, leading to a higher water-holding capacity (WHC).
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