Control of lipid oxidation by nonmigratory active packaging films prepared by photoinitiated graft polymerization.
Transition metal-promoted oxidation impacts the quality, shelf life, and nutrition of many packaged foods. Metal-chelating active packaging therefore offers a means to protect foods against oxidation. Herein, we report the development and characterization of nonmigratory metal-chelating active packaging. To prepare the films, carboxylic acids were grafted onto the surfaces of polypropylene films by photoinitiated graft polymerization of acrylic acid. Attenuated total reflectance/Fourier transform infrared spectroscopy, contact angle, scanning electron microscopy, and iron-chelating assay were used to characterize film properties. Graft polymerization yielded a carboxylic acid density of 68.67 ± 9.99 nmol per cm(2) film, with ferrous iron-chelating activity of 71.07 ± 12.95 nmol per cm(2). The functionalized films extended the lag phase of lipid oxidation in a soybean oil-in-water emulsion system from 2 to 9 days. The application of such nonmigratory active packaging films represents a promising approach to reduce additive use while maintaining food quality.
Department of Food Science, University of Massachusetts, Chenoweth Lab, 102 Holdsworth Way, Amherst, MA 01003, USA.
Fang
F
Tian
Eric A
EA
Decker
Julie M
JM
Goddard
D000179:Acrylates / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry; D018857:Food Packaging / Q000295:instrumentation*; D008055:Lipids / Q000737:chemistry*; D010084:Oxidation-Reduction; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D011126:Polypropylenes / Q000737:chemistry
D000179:Acrylates; D002264:Carboxylic Acids; D008055:Lipids; D011108:Polymers; D011126:Polypropylenes; C036658:acrylic acid