Effect of Storage Temperature on Physical Properties and Application in Packaging of the Soybean Isolate Protein-Corn Starch Composite Films

In order to evaluate the stability of soybean isolate protein (SPI)-corn starch (CS) composite films, physical properties and application in packaging of the SPI-based composite films are observed during storage. Results show that mechanical property changed more obvious (increased TS and descended EB) with increase of storage temperature from 5 to 35 degrees C and increased CS content in the SPI-CS composite films is not in advantage of mechanical property improvement. Furthermore, combined with results of light transmittance, oil barrier property, and water solubility, it is obtained that low temperature (<= 20 degrees C) is preferred for storage of SPI-based composite films, and SPI:CS (4:1) composite film shows best performance during the whole storage. Finally, films applied in packaging result indicate the SPI:CS (4:1) composite film can be selected as seasoning inner packaging at low temperature.