Isolation, characterization and evaluation of the biotechnological potential of bacteria present in the sponge Dysidea fragilis

Abstract

Event Abstract Back to Event Isolation, characterization and evaluation of the biotechnological potential of bacteria present in the sponge Dysidea fragilis Duarte Nuno Carvalho1, Inês M. Franco1, Cristiana I. Gastão1, Susana M. F. Ferreira1, 2* and Maria M. Sampaio1 1 MARE – Marine and Environmental Sciences Centre, ESTM, Instituto Politécnico de Leiria, 2520-641 Peniche, Portugal 2 CFE – Centre for Functional Ecology, Department of Life Science, University of Coimbra, Apartado 3046, 3001-401 Coimbra, Portugal To evaluate the biotechnological potential of microorganisms associated with Dysidea fragilis, 248 bacteria were isolated and characterized, after the solubilization of a portion of lyophilized sponge, caught in the central Atlantic coast of Portugal. Initially colonies were selected based on their phenotypical analysis. They were submitted to Gram and oxidase tests. At this stage, 32 colonies were chosen. In the next step, 16 colonies presenting the highest specific growth rates were selected. The specific growth rate and the dry weight value are important parameters to select species with biotechnological potential for industrial applications. Afterwards, antimicrobial, antioxidant (DPPH radical assay), antifungal and enzymatic activities were evaluated. The antimicrobial tests were made with fish pathogens (Vibrio harveyi, Vibrio anguillarum, Photobacterium damselae subsp. piscida and Aeromonas hidrophyla), but none of the selected colonies registered any inhibitory growth capacity. Nevertheless, it cannot be excluded that they still might be helpful in fighting other types of pathogens. The microorganism that presented better antioxidant and antifungal activities was the isolated colony Dic 33, but Dic 20 also had an interesting antioxidant capacity. The colonies that presented better proteolytic and amylolytic enzymatic activities were Dic 13, 18, 29 and 33. The colony that presented the highest biotechnological potential, according to the tests performed, was the isolated colony Dic 33. This microorganism answered the specific objectives of the present study and it is as promising bacteria for future use as a probiotic. Therefore, further studies are needed, namely to identify the species through genetic sequencing techniques. In sum, the sponge Dysidea fragilis holds a microbial fauna exhibiting important characteristics for industrial application. It is why similar studies are pertinent in scientific research and should be continued, as in the particular case of this species. The authors Duarte Nuno Carvalho and Inês M. A. Franco contributed in the same way. Acknowledgements This work could not have been possible without the support and help of a diversified group of people, to whom we owe many thanks, specifically: Prof. Doctor Alexandra Cruz, Prof. Doctor Américo Rodrigues, Prof. Doctor Carla Tecelão, Prof. Doctor Clélia Afonso, MSc. Susete Pintéus and Dr. Pedro Ramalho. This study had the support of Fundação para a Ciência e Tecnologia (FCT), through the strategic project UID/MAR/04292/2013 granted to MARE. Keywords: Antifungal, antimicrobial, antioxidant, enzyme, growth rate, Isolation, Microorganism, probiotic Conference: IMMR | International Meeting on Marine Research 2016, Peniche, Portugal, 14 Jul - 15 Jul, 2016. Presentation Type: Poster presentation Topic: Blue Biotechnology Citation: Carvalho D, Franco IM, Gastão C, Ferreira S and Sampaio M (2016). Isolation, characterization and evaluation of the biotechnological potential of bacteria present in the sponge Dysidea fragilis. Front. Mar. Sci. Conference Abstract: IMMR | International Meeting on Marine Research 2016. doi: 10.3389/conf.FMARS.2016.04.00059 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 14 May 2016; Published Online: 13 Jul 2016. * Correspondence: Prof. Susana M. F. Ferreira, MARE – Marine and Environmental Sciences Centre, ESTM, Instituto Politécnico de Leiria, 2520-641 Peniche, Peniche, Portugal, susana.ferreira@ipleiria.pt Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Duarte Nuno Carvalho Inês M Franco Cristiana I. Gastão Susana M. F. Ferreira Maria M. Sampaio Google Duarte Nuno Carvalho Inês M Franco Cristiana I. Gastão Susana M. F. Ferreira Maria M. Sampaio Google Scholar Duarte Nuno Carvalho Inês M Franco Cristiana I. Gastão Susana M. F. Ferreira Maria M. Sampaio PubMed Duarte Nuno Carvalho Inês M Franco Cristiana I. Gastão Susana M. F. Ferreira Maria M. Sampaio Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.