Two layer chitosan-beeswax coating for application on artificial collagen casings
2016
Hromiš, Nevena (Faculty of Technology, Novi Sad (Serbia)) | Lazić, Vera (Faculty of Technology, Novi Sad (Serbia)) | Popović, Senka (Faculty of Technology, Novi Sad (Serbia)) | Šuput, Danijela (Faculty of Technology, Novi Sad (Serbia)) | Bulut, Sandra (Faculty of Technology, Novi Sad (Serbia)) | Džinić, Natalija (Faculty of Technology, Novi Sad (Serbia)) | Šojić, Branislav (Faculty of Technology, Novi Sad (Serbia)) | Tomović, Vladimir (Faculty of Technology, Novi Sad (Serbia))
High quality of produced fermented sausages should be preserved during storage, primary from further moisture loss, lipid oxidation and microbiological deterioration. Chitosan, a biopolymer derived from seafood waste, forms films with good gas barrier properties, which could preserve packed product from lipid oxidation, but application of these films is restricted by its water sensitivity and high water vapor permeability. In order to obtain material with desired gas barrier properties, as well as low water vapor permeability and water sensitivity, two layer coating was tested. First layer consisted of chitosan biopolymer with 1%vol caraway essential oil, while second layer consisted of chitosan biopolymer with added growing contents of beeswax. Both layers were applied on collagen casings commercially used in sausage production and obtained material was tested for barrier properties. Oxygen transmission rate of collagen casing material was 2518,8 cm3/(m2 24h 1 bar), while for coated casings oxygen transmission rate was around 70 cm3/(m2 24h 1 bar). Water vapor transmission rate of collagen casing material was 252 g/(m2 24h 1 bar), while coated casings with highest amounts of beeswax had water vapor transmission rates 37,1 g/(m2 24h 1 bar) and 32,7 g/(m2 24h 1 bar). Results show good gas barrier and considerably improved water vapor barrier properties of coated collagen casing material compared to uncoated collagen casing.
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