title: Detection of different microenvironments and Lactobacillus sakei biotypes in Ventricina, a traditional fermented sausage from central Italy.
abstract: The present study evaluated the physico-chemical and microbiological features of Ventricina, considering for the first time the presence of different compartments deriving from the technology of production. In fact meat pieces (pork muscle and fat cut into cubes of about 10-20cm3), mixed with other ingredients and then stuffed into pig bladder, are still distinguishable at the end of the ripening. They appear delimited on the outside by the casing and inside by thin layers consisting of spices (mainly red pepper powder), salt and meat juices. Our results showed that the exterior (portion of the product in contact with the casing), the interstice (area between the different cubes of meat or fat) and the heart (the inner portion of meat cubes) had distinctive values of pH and aw, and a typical microbial progression, so that they can be considered as different ecological niches, here called microenvironments. The study of lactic acid bacteria population, performed with PCR-DGGE and sequence analysis targeting the V1-V3 region of the 16S rRNA gene (rDNA), highlighted the presence of a few species, including Lactobacillus sakei, Lb. plantarum, Weissella hellenica and Leuconostoc mesenteroides. The RAPD-PCR analysis performed on Lb. sakei, recognised as the predominant species, allowed the differentiation into three biotypes, with that characterised by the highest acidifying and proteolytic activities and the highest ability to grow in the presence of sodium chloride prevailing. This leading biotype, detectable in the interstice during the entire ripening period, was isolated in the microenvironments exterior and heart starting from the 30th d of ripening, and it was the sole biotype present at the end of the ripening. The analysis of microenvironments through the scanning electron microscopy (SEM) evidenced the presence of micro-channels, which could favour the microbial flow from the interstice to the exterior and the heart. Moreover, the SEM analysis allowed the detection of biofilms, recognised as responsible for the correct colonisation of the different meat niches.
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy.
authors.forename: Patrizio
authors.initials: P
authors.lastname: Tremonte
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy.
authors.forename: Elena
authors.initials: E
authors.lastname: Sorrentino
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy.
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Pannella
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Tipaldi
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy.
authors.forename: Marina
authors.initials: M
authors.lastname: Sturchio
authors.affiliation: Azienda Ospedaliera San Giuseppe Moscati, 83100 Avellino, Italy.
authors.forename: Armando
authors.initials: A
authors.lastname: Masucci
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy.
authors.forename: Lucia
authors.initials: L
authors.lastname: Maiuro
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy.
authors.forename: Raffaele
authors.initials: R
authors.lastname: Coppola
authors.affiliation: Dipartimento Agricoltura, Ambiente, Alimenti (DIAAA), Università degli Studi del Molise, via De Sanctis snc, 86100 Campobasso, Italy. Electronic address: succi@unimol.it.
authors.forename: Mariantonietta
authors.initials: M
authors.lastname: Succi
mesh_terms: D000818:Animals; D004269:DNA, Bacterial / Q000235:genetics; D005285:Fermentation; D005516:Food Microbiology; D007558:Italy; D000070256:Latilactobacillus sakei / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D008461:Meat Products / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D019105:Random Amplified Polymorphic DNA Technique; D013552:Swine
chemical_list: D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S
keywords: Fermented meat; Lactobacillus sakei; Microenvironments; Scanning electron microscopy; Ventricina