Effect of Packaging Materials on the Storage Quality of Purple Rice

Abstract

Purple rice is susceptible to the influence of internal and external factors such as temperature, humidity and oxygen during storage, and proper packaging can effectively inhibit aging and mildew of purple rice. In this study, purple rice was packed and stored for 98 days using four packaging materials with different barrier properties, AL/PE, PA/PE single-sided embossed, PA/PE, PE/EVOH/PA/PE, and the dynamic changes of moisture content, fatty acid value, protein content, mold count, electrical conductivity, color value, color difference, E-nose odor, morphological structure and other indicators of purple rice were measured periodically during storage and correlation analysis was performed for each indicator. The results showed that the moisture content of purple rice increased and then decreased, the conductivity increased and then decreased, the △E and fatty acid value increased, the protein content increased slightly and then decreased, the mold count increased and then decreased to stable, and the electronic nose could significantly distinguish purple rice in different storage periods and different packaging materials. From the moisture content, △E, color value, fatty acid value and morphological structure indexes, the quality of purple rice packed with high barrier material PE/EVOH/PA/PE was more stable, and from the indexes of mold count and conductivity, the quality of purple rice packed with PA/PE single-sided embossed material was more stable.

Keywords

• purple rice
• packaging materials
• barrier
• preservation
• brown rice