The aim of this study was to evaluate the shelf life of four commercial formulations pork sausage (Control - no added additive, F1 - added 3% sodium lactate, F2 - added 0.5% nisin and F3 - added 3 % sodium lactate and 0.5% nisin). The samples were distributed into polyethylene bags containing 200 grams for each day of storage and formulation for subsequent bacteriological and physicochemical analysis. All formulations were vacuum packed and stored at 4°C. Regarding the shelf life samples were submitted to the following bacteriological counts of heterotrophic bacteria aerobic mesophilic and psychrotrophic; count of lactic acid bacteria count and Enterobacteriaceae. The analyzes were carried out physico-chemical: pH, water activity and the content of thiobarbituric acid reactive substance. Interpreting the results obtained in the experiment it was concluded that the use of a combination of 3% sodium lactate and 0.5% nisin increased the shelf life compared to other samples. Key words: natural antimicrobial, bacteriocin, storage and pork sausage filling.
