EFFET DES COMPOSES PHENOLIQUES DE Laurus nobilis L. SUR LA QUALITE MICROBIOLOGIQUE DE LA VIANDE DE POULET DE CHAIRE CONSERVEE AU FROID POSITIF DE 4°C

Abstract

This study aims to monitor the antimicrobial effect of the hydroethanol extract of Laurus nobilis. L cultivated in the region of Tizi Guenif in the wilaya of Tizi Ouzou against some germs of contamination of broiler meat during its conservation in positive cold at 4°C. The extraction of phenolic compounds of Laurus was carried out by maceration of a 60g powder of the leaves of the laurel plant dried during 6 hours in a hydroethanolic solution.The crude extract recovered after filtration and evaporation was added in triplicate at a rate of 1, 2 and 3% on pieces of 300 g of chicken pectoral meat, each placed in a polystyrene tray.The meats treated or not with laurel extract were then stored at 4°C for 5 days.The microbiological analyses carried out on the experimental samples during storage concerned the enumeration of total germs, faecal coliforms, total coliforms, Staphylococcus aureus, pseudomonas aeroginosa and psychrotrophic germs. The results underwent a randomized analysis of variance and a comparison of means two by two according to the Newman and Keuls test. Before the third day of storage at 4°C, the microbiological quality of broiler meat enriched with hydroethanol extract of Laurus nobilis L at 3% as a natural additive was clearly preserved. The hydroethanolic extract of Laurus nobilis L showed an interesting antimicrobial activity particularly towards the studied germs except the psychrotrophic flora implied in the food toxi infection of spoiled meats.