Development and Characterization of Protein-based Porous Materials
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Abstract:
Pickering High Internal Phase Emulsion (HIPEs) template stabilized by self-assembled gliadin particles (GP) was used to prepare porous materials with open-cell structure and the physical performance were characterized. Using GP as a particulate emulsifier, HIPEs template was prepared with the mixture of acrylamide and polyethylene glycol as water phase and n-dodecane as oil phase. Furthermore, the effects of protein concentration and oil phase volume on the properties of porous materials were also studied. The result showed that under pH 4, GP concentrations of 1.5%, 2.0% and 2.5% and oil phase volume of 75%, 80% and 85% can be used to prepare stable hydrophilic porous materials using HIPEs templates. When the concentration of GP increased from 1.5% to 2.5%, the particle size of the emulsion in HIPEs decreased, the pore wall of the internal structure became thicker, the apparent density increased, and the compressive modulus increased from 15.16 MPa to 18.01 MPa. Besides, porous material prepared by 2.0% GP concentration had good moisture holding capacity, with the water absorption rate of 10.18 g/g. In addition, as the oil phase volume increased from 75% to 85%, the particle size distribution of the emulsion became more uniform, the pores of the material D3,2 increased from 19.94 μm to 23.59 μm, the apparent density decreased, and the compressive modulus decreased from 22.58 MPa to 14.67 MPa. By using HIPEs template stabilized by GP, hydrophilic porous materials with open-cell structure and good mechanical properties were successfully prepared, which is of great significance for the application of porous polymeric materials in food and biomedicine.
