survey on the shelf life extension of foods with nanofilms

ABSTRACT

Nanotechnology is a method of controlling materials in the atomic scale and can be used for producing new materials, products and instruments. One of the important usages of nanotechnology is the field of food science. With the nanotechnology, intelligent packaging with response to the environment, repairing itself or informing the customer from the contamination can be achieved. Nanofilms also can protect the foods from microorganisms. This survey has been done to evaluate the effects of nanofilms on the extension of sausages shelf life. 14 samples of cocktail sausages from a defined brand are selected haphazardly and divided into two groups [A] as control with 7 samples and B" as case with remained another 7 samples. Group [A] samples were in the original packaging, but the group [B] packed in nanofilms of Nanosilver coated on Titanium dioxide [TiO2]. All the samples [A and B] had put in an empty refrigerator. Every 3 days one of the samples from group [A] and one of the samples from group [B] is removed from the refrigerator and referred to the panelists for organoleptic and sensory evaluations. The results were recorded in a questionnaire. With the information from the questionnaires and SPSS analysis of parameters it could be said that 40 percent of group "A" and 74.3 percent of group [B] were acceptable for the color parameter.42.9 percent of group [A] and 74.3 percent of group [B] were acceptable for the taste parameter.48.6 percent of group [A] and 80 percent of group [B] were acceptable for consistency parameter.45.7 percent of group [A] and 85.7 percent of group [B] were acceptable for visual inspection.40 percent of group [A] and 80 percent of group "B" were acceptable for the odor parameter. Analysis of results show that nanofilms can extend the shelf life of cocktail sausages and [B] samples in the nanofilms were acceptable and consumable for visual inspection and color even after expiry date, but the group [A] was unacceptable and inconsumable after expiry date because of notable changes in odor, color and visual inspection