The effect of sonicated cell-free supernatant from Lacticaseibacillus paracasei B1 and Lactiplantibacillus plantarum O24 on selected quality determinants of cooked pork sausages

The aim of the study was to assess the effect of lyophilized cell-free supernatant (CFS) obtained from Lacticaseibacillus paracasei B1 and Lactiplantibacillus plantarum O24 cultures on the characteristics of cooked pork sausages stored by 21 days at 4 °C. The following parameters were assessed: antioxidant activity (ABTS, Reducing Power, Fe-chelating activity), texture parameters (hardness, springiness, gumminess, chewiness) and color changes (L*,a*,b*), as well as the fatty acid profile and TBARS content as an indicator of lipid oxidation. Microbiological status was also assessed. The results showed that the use of lyophilized CFS had a significant effect on the pH, oxidation status and texture properties of sausages. Products with the addition of CFS from L. paracasei B1 were characterized by lower hardness, gumminess and chewiness compared to variants with L. plantarum O24. Neither the strain type nor the method of CFS treatment caused changes in the color of cooked pork sausages. During storage time, an increase in the TBARS index was also observed on the 7th day of storage, which indicates an intensification of lipid oxidation processes, especially in products with CFS obtained from L. paracasei B1. All sausages retained the appropriate microbiological quality. Considering the effect of sonication as an additional procedure at the stage of obtaining CFS, the sausage samples to which it was applied (B1_S and O24_S) showed higher antioxidant activity, but at the same time were more susceptible to lipid oxidation processes.