Microorganism control and product quality improvement of Twice-cooked pork dish using ZnO nanoparticles combined radio frequency pasteurization

ZnO nanoparticles combined radio frequency (ZNCRF) is a novel and effective method of pasteurization. This study was designed to evaluate microorganism control and product quality improvement (sensory, texture, thiobarbituric acid reactive substances (TBARS), flavor and GC-MS determination) of Twice-cooked pork dish using ZNCRF pasteurization. The results showed that the combined pasteurization effect of ZNCRF treatments was superior to conventional high pressure steam (HPS) sterilization. ZNCRF pasteurization preserved the heating uniformity and reduced the loss of sensory, texture and flavor of Twice-cooked pork dish at the same time scale and met China's national standard (GB29921-2013). In order to explain the above changes in principle, volatile organic compounds of Twice-cooked pork dish samples were measured on GC-MS. The measurement result of GC-MS indicated that aldehydes (a typical flavor of Twice-cooked pork dish) decreased from 71.56% to 62.51% with the increase of germicidal strength. Therefore, the experimental results of ZNCRF pasteurization could be helpful for food processing industries to produce high quality sterilized Twice-cooked pork dish.