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

Abstract 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 °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 °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.