2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Development of Antimicrobial and UV-block Edible Film Incorporated with TiO2 Nanoparticle

J. Zhou, L. Shi, S. Gunasekaran
University of Wisconsin Madison, US

Keywords:
TiO2 nanoparticle, WPI film, antimicrobial, UV-block

Abstract:
Functional food packaging systems using various biopolymers, including edible films and coatings, have gathered great attention and the beneficial effects obtained by using edible film and coating have been reported(Choi and Han, 2001). The usage of edible films to carry some food additives with bioactivities such as antioxidants, antimicrobials, fortified nutrients has also been studied(Kim et al., 2006). Although biologically derived antimicrobial materials such as bacteriocins and enzymes have been investigated by the food industry to control surface contamination, the applications are hampered by the high cost. TiO2 is an inert, nontoxic and cheap material which has potential activity against all kinds of microbes. The incorporation of TiO2 nanoparticles into synthetical food packaging copolymers has been developed in which TiO2 was used as biocidal agents(Kubacka et al., 2007). We incorporated TiO2 nanoparticles into whey protein isolate (WPI) film to study its antimicrobial properties. TiO2 nanoparticles were mixed with WPI solution and heat denatured to make film-forming solution followed by casting in the Petri-dish coated with Sigma coating oil. X-RD was used to determine the existence of TiO2 in the protein matrix. Antimicrobial activity of the WPI film containing TiO2 was studied against food pathogenic (E. coli O157:H7 and S. enterica). UV Spectrophotometer and FTIR were used to characterize UV absorption properties of the film. The physical and mechanical properties of the WPI film containing TiO2 were also studied. SEM was used to determine the surface characteristic of the film. In addition, the effects of TiO2 nanoparticle incorporation to the rheological and physicochemical properties of WPI solution were also conducted. Our results indicated that TiO2 nanoparticles can be successfully incorporated into WPI film and have significant antimicrobial activities against food pathogenic. The UV absorption properties increased with the increased concentration of TiO2 nanoparticles.


Nanotech 2008 Conference Program Abstract