A method for improving oil resistance of soybean protein isolate film
A soybean protein isolate and oil-blocking technology, which is applied in the field of polymer materials, can solve the problems of unfavorable amplification, reduced oil-blocking performance, and difficulty in adapting to industrial production.
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Embodiment 1
[0022] Soy protein isolate at a concentration of 50 mg / mL was dissolved in distilled water to form a suspension. Heat and stir in a water bath at 80 °C for 90 min, add 5% sucrose stearate ( W / W , sucrose stearate / protein), and stirred evenly at high speed to form a transparent solution, filtered, and degassed. The mixed solution was poured onto a plexiglass plate and cast evenly, and placed horizontally for 2 h. After the surface of the film was formed, it was dried in an oven at 80 °C for 2 h, and the film was immediately removed, and stored in a desiccator at a temperature of 25 °C and a relative humidity of 50% for 48 h before use.
[0023] According to the measurement method of the above-mentioned oil permeability coefficient, measure the oil permeability coefficient of the SPI membrane po is 3.45 g mm / (m 2 d).
Embodiment 2
[0025] Soy protein isolate at a concentration of 50 mg / mL was dissolved in distilled water to form a suspension. Heat and stir in a water bath at 50 °C for 150 min, add 15% sucrose palmitate ( W / W , sucrose palmitate / protein), and stirred at high speed to form a transparent solution, filtered, and degassed. The mixed solution was poured onto a plexiglass plate and cast evenly, and placed horizontally for 2 h. After the surface of the film was formed, it was dried in an oven at 80 °C for 2 h, and the film was immediately removed, and stored in a desiccator at a temperature of 25 °C and a relative humidity of 50% for 48 h before use.
[0026] According to the measurement method of the above-mentioned oil permeability coefficient, measure the oil permeability coefficient of the SPI membrane po is 5.71 g mm / (m 2 d).
Embodiment 3
[0028] Soy protein isolate at a concentration of 50 mg / mL was dissolved in distilled water to form a suspension. Heat and stir in a water bath at 65 °C for 30 min, add 25% sucrose oleate ( W / W , sucrose oleate / protein), and stirred evenly at high speed to form a transparent solution, filtered, and degassed. The mixed solution was poured onto a plexiglass plate and cast evenly, and placed horizontally for 2 h. After the surface of the film was formed, it was dried in an oven at 80 °C for 2 h, and the film was immediately removed, and stored in a desiccator at a temperature of 25 °C and a relative humidity of 50% for 48 h before use.
[0029] According to the measurement method of the above-mentioned oil permeability coefficient, measure the oil permeability coefficient of the SPI membrane po is 7.43 g mm / (m 2 d).
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