Composite Films Contained Rare Earth Lanthanum Doped Nano TiO2 as Efficient Materials for Packaging Preservation
GUO Yuntian1, WANG Hanqing2
1 School of Urban and Environmental, Hunan University of Technology, Zhuzhou 412007; 2 School of Civil Engineering, University of South China, Hengyang 421000
Abstract: Fruits and fungus are short-shelf life products which are easily decaying caused by micro-organism and dehydration caused by respiration. This paper presented a pioneering attempt to prepare PVA-based packaging composite films contained lanthanum doped nano-TiO2 (La3+-TiO2) and to apply it as preservation material for strawberry and agaricus blazei. Characterizations of La3+-TiO2 were done by XRD, SEM and LPSA. The distortion occurred in lattice of TiO2 and led the particle size reduced, surface energy increased and dispersity in PVA matrix improved due to the doping of La3+. Barrier performance of the composite films were improved by adding La3+-TiO2, and it was revealed that the composite films obtained the optimal barrier performance when mass fraction of La3+-TiO2 reached 1.6%. The water vapor permeability and oxygen permeability were decreased by 45.9% and 38.0%, respectively. Results of antibacterial tests showed that spectrum utilization range of nano-TiO2 had widened by La3+ doping, so that the antibacterial rate of the composite films against E. coli. and S. aureus were respectively beyond 84.1% and 91.8% in natural light. The strawberries were well preserved for 10 d at room temperature by the composite films, the rotted rate and weight loss rate were both controlled below 5%. The shelf life of agaricus blazei was also extended from 2 d to 5 d at room temperature, due to the composite films slowed down the browning, autolysis and other phenomena during the storage of agaricus blazei.
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2018, Vol. 32 
