Defining conditions for biofilm inhibition and eradication assays for Gram-positive clinical reference strains

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http://hdl.handle.net/10138/275010

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Cruz , C D , Shah , S & Tammela , P 2018 , ' Defining conditions for biofilm inhibition and eradication assays for Gram-positive clinical reference strains ' , BMC Microbiology , vol. 18 , 173 . https://doi.org/10.1186/s12866-018-1321-6

Title: Defining conditions for biofilm inhibition and eradication assays for Gram-positive clinical reference strains
Author: Cruz, Cristina D.; Shah, Shreya; Tammela, Paivi
Contributor: University of Helsinki, Division of Pharmaceutical Biosciences
University of Helsinki, Drug Research Program
Date: 2018-11-03
Language: eng
Number of pages: 9
Belongs to series: BMC Microbiology
ISSN: 1471-2180
URI: http://hdl.handle.net/10138/275010
Abstract: BackgroundBiofilms are formed by a complex bacterial community encapsulated by a polymeric matrix, with strong adherent properties and persistent phenotype. Biofilms are considered one of the most challenging areas of modern medicine. Existing antibiotics have been developed against free-floating bacterial cells, and thus, many treatments of biofilm-related infection fail. In this study, we compared the effects of different media on biofilm growth of clinical reference strains of Staphylococci and Enterococci, including multi-drug resistant representatives. Further, we optimized the resazurin-based assay for determining the minimal biofilm inhibitory concentration (MBIC) of standard antibiotics, and evaluated its use for the determination of minimal biofilm eradication concentration (MBEC).ResultsWe showed that tryptic soy broth supplemented with 1% glucose was an optimal media for maximum biofilm growth of all strains tested, with an extended incubation time for Enterococci. A range of parameters were tested for the resazurin assay, including concentration, temperature and time of incubation. Using quality parameters to analyze the assay's performance, the conditions for the resazurin assay were set as follows: 4g/mL and 8g/mL, with incubation at 25 degrees C for 20min and 40min for Staphylococci and Enterococci, respectively.ConclusionsIn summary, we defined conditions for optimal biofilm growth and for standardized resazurin assay for MBIC determination against six Gram-positive clinical reference strains. We also observed that MBEC determination by the resazurin-based assay is limited due to the poor detection limit of the assay. Complementary cell counting data is needed for precise determination of MBEC.
Subject: Biofilm
Media
Glucose
Gram-positive bacteria
Crystal violet
Resazurin
Ciprofloxacin
Linezolid
MBIC
MBEC
STAPHYLOCOCCUS-AUREUS BIOFILMS
THROUGHPUT SCREENING ASSAYS
ENTEROCOCCUS-FAECALIS
MICROBIAL BIOFILMS
MICROTITER PLATES
IN-VITRO
QUANTIFICATION
RESAZURIN
ANTIBACTERIAL
GELATINASE
1183 Plant biology, microbiology, virology
317 Pharmacy
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