Isolation, identification and antimicrobial activity of lactic acid bacteria from the Bahía Blanca Estuary

Abstract

Isolation, identification and antimicrobial activity of lactic acid bacteria from the Bahía Blanca Estuary Aislamiento, identificación y actividad antimicrobiana de bacterias del ácido láctico del estuario de Bahía Blanca

Biocontrol of Listeria monocytogenes by lactic acid bacteria isolated from brewer's grains used as feedstuff in Argentina

“…They reported antimicrobial activity of CFS from Lactobacillus species and found a higher inhibitory effect with untreated supernatants, as compared to neutralized supernatants. Similar findings were obtained by Sica et al (2010), who stated that all CFS from LAB showed antimicrobial activity on L. monocytogenes, and only some supernatants maintained their inhibitory activity after being neutralized with 5 N sodium hydroxide. The authors explained that the loss of antimicrobial activity after neutralizing the supernatant was due to the fact that the strains were only capable of producing organic acids.…”

Characterization of probiotic properties of lactic acid bacteria isolated from an estuarine environment for application in rainbow trout (Oncorhynchus mykiss, Walbaum) farming

“…All strains were isolated from fish and sediments of Bahía Blanca Estuary (Table 1) in a previous study and they were selected for this study by presenting growth inhibitory effects against the salmonid pathogens: Aeromonas salmonicida subsp. salmonicida, Yersinia ruckeri and two strains of Lactococcus garvieae (Sica et al 2010). The 16S rRNA gene sequence accession numbers for each strain are given in Table 1.…”

“…The aim of the present study was to characterize the probiotic properties of the 12 selected LAB strains obtained previously (Sica et al 2010), to consider their application in rainbow trout farming, by examining their pH and bile tolerance, in vitro adhesion to rainbow trout mucus and competitive exclusion of two relevant salmonid pathogens.…”

“…However, no studies have been carried out on LAB from marine and estuarine environments. In a previous study, 21 LAB strains were isolated from fish guts and sediments from the Bahía Blanca estuary; 12 strains were preliminary selected based on their ability to inhibit the growth of salmonid pathogens (Sica et al 2010). Considering the probiotic potential of LAB, the investigation of these strains from coastal marine environments becomes important and could provide new strains with applications in aquaculture.…”

Guava Psidium guajava seed flour and dry Aspergillus niger mycelium as nitrogen sources for the production of biomass and antimicrobial compounds produced by Weissella confusa

“…These compounds have a high cost (Serna-Cock et al 2010;Sica et al 2010). Pure substrates that are utilized as carbon sources, such as lactose, glucose, starch and cellulose, require the addition of complex nitrogenized sources such as peptones and yeast extracts (Altaf et al 2007;Serna-Cock and Rodríguez-De Stouvenel, 2007), which can be substituted for less expensive renewable resources such as pigeon pea flour, red lentils, black chickpea, Bengal grain and soy (Hurok et al 2005;Altaf et al 2007;Rojan et al 2009).…”