Streptomyces lunalinharesii 235 prevents the formation of a sulfate-reducing bacterial biofilm.
Streptomyces lunalinharesii strain 235 produces an antimicrobial substance that is active against sulfate reducing bacteria, the major bacterial group responsible for biofilm formation and biocorrosion in petroleum reservoirs. The use of this antimicrobial substance for sulfate reducing bacteria control is therefore a promising alternative to chemical biocides. In this study the antimicrobial substance did not interfere with the biofilm stability, but the sulfate reducing bacteria biofilm formation was six-fold smaller in carbon steel coupons treated with the antimicrobial substance when compared to the untreated control. A reduction in the most probable number counts of planktonic cells of sulfate reducing bacteria was observed after treatments with the sub-minimal inhibitory concentration, minimal inhibitory concentration, and supra-minimal inhibitory concentration of the antimicrobial substance. Additionally, when the treated coupons were analyzed by scanning electron microscopy, the biofilm formation was found to be substantially reduced when the supra-minimal inhibitory concentration of the antimicrobial substance was used. The coupons used for the biofilm formation had a small weight loss after antimicrobial substance treatment, but corrosion damage was not observed by scanning electron microscopy. The absence of the dsrA gene fragment in the scraped cell suspension after treatment with the supra-minimal inhibitory concentration of the antimicrobial substance suggests that Desulfovibrio alaskensis was not able to adhere to the coupons. This is the first report on an antimicrobial substance produced by Streptomyces active against sulfate reducing bacteria biofilm formation. The application of antimicrobial substance as a potential biocide for sulfate reducing bacteria growth control could be of great interest to the petroleum industry.
Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Juliana Pacheco da
JP
Rosa
Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Samyra Raquel Gonçalves
SR
Tibúrcio
Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Joana Montezano
JM
Marques
Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil. Electronic address: lseldin@micro.ufrj.br.
Lucy
L
Seldin
Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Rosalie Reed Rodrigues
RR
Coelho
D000900:Anti-Bacterial Agents / Q000494:pharmacology; D000898:Antibiosis; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development; D008826:Microbial Sensitivity Tests; D010084:Oxidation-Reduction; D013302:Streptomyces / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D013431:Sulfates / Q000378:metabolism*
D000900:Anti-Bacterial Agents; D013431:Sulfates
Antimicrobial substance; Biocorrosion; Biofilm; Streptomyces; Sulfate reducing bacteria