Properties of soy protein isolate/nano‐silica films and their applications in the preservation of Flammulina velutipes

Abstract

This work evaluated the properties of soy protein isolate (SPI)/nano‐silica (nano‐SiO2) films. The particle size distribution of the film solutions and the Fourier‐transform infrared spectroscopy, X‐ray diffraction, and X‐ray photoelectron spectroscopy of films indicated that there were hydrogen bonds and coordinate bonds between the SPI and nano‐SiO2. Scanning electron microscopy images indicated that an appropriate increase in the nano‐SiO2 content improved the morphology of the films. Finally, the effect of SPI‐based nanocomposite films on the preservation of Flammulina velutipes at 4 ± 1°C was investigated. After 10 days of storage, the weight loss and browning degree of F. velutipes in SPI films with 6% nano‐SiO2 were significantly lower (p < .05), and the use of SPI/nano‐SiO2 films could mitigate the losses of the total soluble solids and soluble protein contents. Therefore, SPI/nano‐SiO2 films can prolong the shelf life and optimize the production of F. velutipes. Practical applications Fresh F. velutipes is nutritious and contains essential amino acids, vitamins, minerals, proteins, and fats. However, F. velutipes quickly undergoes browning, aging, and decomposition. Therefore, research in the F. velutipes preservation technology has important practical significance. In food packaging, the application of nanotechnology is gradually replacing traditional food packaging. However, no studies have reported the effects of SPI‐based nanocomposite materials on the shelf life of F. velutipes. Therefore, the present study aimed to evaluate the properties of films and applications with F. velutipes.

Effect of cinnamaldehyde incorporation on the structural and physical properties, functional activity of soy protein isolate‐egg white composite edible films

“…The water contact angle of the films was measured using an OCA20 (DataPhysics, Germany) contact angle instrument according to the method described by Xu et al. (2019). In brief, distilled water (10 μl) was dripped onto the film surface, and the angle between the surface and the droplet was measured.…”

Preparation and Characterization of Double-Layered Microcapsules Containing Nano-SiO2

“…The results indicated that nano-SiO 2 can improve the stability of a microcapsule, which was consistent with the DSC results in Section 3.4. According to reports of Xu et al [43], the addition of nano-SiO 2 to the composite film resulted in the improvement of mechanical properties because of the formation of the network structure between nano-SiO 2 and the SPI matrix. In this study, the storage stability of DMS/nano-SiO 2 was significantly (p < 0:05) higher than those of the three other groups (i.e., APESs, SMs, and DMs), which is due to the addition of nano-SiO 2 that improved the mechanical properties of the microcapsule wall materials.…”

“…The results indicated that the addition of nano-SiO 2 had a positive protective effect on the preservation of anthocyanin microcapsules. In recent years, many studies have shown that nano-SiO 2 can improve the water resistance and mechanical properties of the composite films containing nano-SiO 2 [21,35,43,45]. The t 1/2 value of DMs/nano-SiO 2 is 253.68, 212.31, 107.98, and 90.83 d at 11%, 33%, 53%, and 75% of the relative humidity, respectively.…”

Preparation and characterization of soy protein isolate/SiO2 nanocomposite films and their walnut oil microcapsules

“…Nanoparticles can be used as fillers to improve the water permeability, carbon dioxide permeability, and oxygen permeability (OP) of the film for enhancing the physical properties of packaging materials. 15 Nanoparticles such as nano-silver, 16 nano-clay, 17 carbon nanoparticles, 18 and silicon dioxide, [19][20][21] ZnO nanoparticles, 22 exhibit improved mechanical, protective, and thermal properties in food packaging materials. Silica nanoparticles (nano-SiO 2 ) can effectively improve the properties of materials because of high surface energy, large surface atom ratio, large specific surface area, and its small particle size.…”

“…Silica nanoparticles (nano-SiO 2 ) can effectively improve the properties of materials because of high surface energy, large surface atom ratio, large specific surface area, and its small particle size. 15,20 Han and Wang 20 reported that the incorporation of SiO 2 nanoparticles can improve the water barrier and mechanical properties of SPI films. Xu et al 15 reported that a SPI with nano-SiO 2 can prolong the shelf life and improve the production of flammulina velutipes.…”