Biopolymer based films can satisfy the consumer demand for ecologically safe food packaging
material. Functional compound(s) can be added to matrix biopolymer to obtain active packaging
This study aimed at developing active film using blends of wheat gluten and corn zein. The usability of greed
tea extract as active component to prevent oxidation in packed food was also evaluated.
Composite films of zein and gluten in the ratio 1:1, 1:2, and 1:3 were prepared by dissolving the polymers in
required quantity in ethanol. The solutions were homogenized, degassed, casted and dried at 50˚C and 50%
RH. Green tea extract (GTE) was used as active component in these films.
The zein films were homogenous but brittle, while gluten films were flexible. Blending resulted in easy to
handle films. Transparency of composite films improved with increasing proportion of gluten. The ability to
block UV light was not affected by blending the polymers. Tensile strength of the composite films did not
vary with varying composition of films but improvement in percent elongation was observed with increasing
proportion of gluten. The solubility of the films reduced as the proportion of gluten in the matrix increased
without affecting water vapour permeability. Incorporation of GTE did not affect optical and mechanical
properties and imparted antioxidant properties to the film. The active films inhibited lipid peroxidation in
These films show good potential as active packaging material for prevention of oxidative changes in meat.