Effect of nano-TiO2-LDPE packaging on microbiological and physicochemical quality of Pacific white shrimp during chilled storage

Nano-TiO2-modified low-density polyethylene (NTLDPE) packaging was prepared by blending LDPE with nano-TiO2. The effects of NTLDPE packaging on quality of Pacific white shrimp during storage at 4 degrees C were investigated. Results showed that NTLDPE lowered the K value by 28.50%, while increased sensory score by 30.77% in comparison with the control. NTLDPE packaging retarded the decrease of whiteness and water holding capacity and the increase of melanosis score based on the signs of freshness and deterioration of shrimp. Furthermore, NTLDPE packaging reduced total viable counts (TVC) by 6.42% and total volatile basic nitrogen (TVB-N) contents were 14.82% lower than that of control. TVB-N content and TBARS value, as well as polyphenol oxidase activity and TVC, were maintained and shrimp remained a commercial acceptability for 8days. The overall results indicated that NTLDPE packaging could preserve the quality and extend the shelf-life of Pacific white shrimp.