Abstract:
Smart packagings for detecting climacteric fruit freshness were prepared based on low density polyethylene (LDPE)/chromophores (bromothymol blue) modified PCH (PCH-BTB) nanocomposite films. The incorporation of chromophores in porous materials was investigated by N₂ adsorption-desorption, XRD and SEM. The nanaocomposite was prepared by twin screw extruder and fabricated into nanocomposite film by compression molding. The color change of LDPE/PCH-BTB nanocomposite films from green to yellow correlated with standard CO₂ levels, which can be compared to CO₂ levels from respiration during fruit ripening. Porous clay improved the barrier properties of nanocomposite indicated by the reduction of oxygen transmission rate. Thus, LDPE/PCH-BTB nanocomposite films can be applied for detecting the quality of climacteric fruit by color change. In addition, this pH indicator can prolong the shelf-life of product by incorporated porous materials into the films.
