Journal of Food Processing & Technology

Effects of active zein films having different release profiles on Listeria monocytogenes growth and lipid oxidation in fresh kashar cheese

6^th Global Summit and Expo on Food & Beverages

August 03-05, 2015 Orlando-FL, USA

Figen Korel

Posters-Accepted Abstracts: J Food Process Technol

Abstract:

There has been a growing interest to develop packaging materials incorporating functional agents and enhance quality and shelflife of packed foods. Active packaging containing antimicrobial and antioxidant agents is one of the most promising areas since application of this method can improve safety of foods by inhibiting pathogenic/spoilage bacteria and prevent quality losses due to lipid oxidation by using minimum amounts of active agents. Nowadays, health concerns of consumers and environmental problems related to plastics increased. In this study, zein and zein?wax composite films incorporating lysozyme and mixture of lysozyme, catechin and gallic acid with different controlled release properties were developed and their antimicrobial and antioxidant activities were investigated on fresh Kashar cheese inoculated with Listeria monocytogenes. All lysozyme containing films inhibited the growth of L. monocytogenes in Kashar cheese for 8 weeks at 4 �C, but it is only the zein?wax composite films with sustained lysozyme-release rates caused a significant reduction (?0.4 decimals) in initial microbial load of inoculated samples. The films having mixtures of catechin and gallic acid had an antimicrobial activity against L. monocytogenes in vitro, but they showed no considerable antimicrobial activity in cheese. However, the films having catechin and gallic acid inhibited the oxidative changes in cheese. This study showed the possibility of increasing safety and quality of fresh cheeses by use of active packaging employing natural antimicrobial compounds and controlled release technology. It is concluded that there is a potential of using flexible antimicrobial and antioxidant films with controlled release properties in diary industry.