稀土镧掺杂纳米二氧化钛复合保鲜包装薄膜的研究

doi:10.11896/j.issn.1005-023X.2018.24.027

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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.

Key words： rare earth lanthanum nano-titanium dioxide packaging composite film barrier property preservation perfor-mance

Published: 23 January 2019

CLC number:

TQ325

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	GUO Yuntian
	WANG Hanqing

Cite this article:

GUO Yuntian,WANG Hanqing. Composite Films Contained Rare Earth Lanthanum Doped Nano TiO₂ as Efficient Materials for Packaging Preservation[J]. Materials Reports, 2018, 32(24): 4357-4362.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.24.027 OR http://www.mater-rep.com/EN/Y2018/V32/I24/4357

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