关键词: 玉木耳多糖；玉米淀粉；理化特性；结构性质

Abstract: In this paper, different concentrations of polysaccharides extracted from Auricularia cornea Ehrenb. were used to prepare corn starch-polysaccharide blends, and their physicochemical and structural properties were studied. The results showed that compared with those of corn starch, the peak viscosity and peak time of blends was increased, the breakdown and setback was decreased, the peak temperature (TP) was increased significantly, and the enthalpy difference (ΔH) was decreased, indicating improved stability and anti-aging capacity. This effect was more significant with increasing level of polysaccharide addition. After the addition of the polysaccharides, the consistency coefficient K was increased, the fluid index n was decreased, the pseudoplasticity was enhanced leading to the easier occurrence of shear thinning, and the storage and loss moduli were increased. The maximum storage modulus was observed with addition of 0.5% A. cornea Ehrenb. polysaccharides. Scanning electron microscopy (SEM) showed that the polysaccharides reduced the size of pores within the microstructure, and the blends with 0.5% and 1.0% A. cornea Ehrenb. polysaccharides had a more uniform and dense gel structure. Infrared spectroscopy showed that no new groups were formed in the starch-polysaccharide blends. The structural orderliness of starch was improved at an addition level of 0.5% but reduced at 1.0%, 2.0%, 5.0% and 10.0%. This study can provide a reference for the application of A. cornea Ehrenb. polysaccharides in starch-based foods.

Key words: Auricularia cornea Ehrenb. polysaccharide; corn starch; physicochemical properties; structural properties