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Biofilmforming bacteria cultured on antibacterial Surface
Kristianstad University, School of Education and Environment.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Biofilmsbildande bakterier odlade på en antibakteriell yta (Swedish)
Abstract [en]

Abstract

Background: To prevent bacteria from forming biofilm on medical devices is an important challenge.Biofilm formation is associated with decreased susceptibility to antibioticsand the development of antibiotic resistance. The problem has to be solved by both preventing the formation of biofilm and development of new antibiotics directed to the formation of biofilm. Antibacterial coating on medical devices is a preventive action to decrease the risk of catheter related infections. The Bactiguard coating is one example, and has been clinically proven to reduce infections. But if the Bactiguard coating affects formation of microbal biofilm or production of extracellular polymeric substances (EPS) is not yet fully understood.

Methods: The amount of biofilm formed on coated and uncoated surface was compared by staining of EPS. Three different bacterial species were cultured separately and together.

Results: All three species of bacteria did form biofilm on Bactiguard coated surface. However, there was significantly less bacterial growth on the Bactiguard coated microtiter plates compared to the uncoated. Quantification of EPS was not successful. Colonization of S. epidermidis appeared differently on Bactiguard coated microscope slides after 4-8 h of culture.

Discussion: The antibacterial effects of Bactiguard coated catheters seem to be more connected to inhibited adherence of bacteria to the surface.  The coating has to be optimized for further study on microtiterplates.

 

Abstract [sv]

Abstrakt

Bakgrund: Det är viktigt att förebygga att baketerier bildar biofilm på medicinska katetrar. Biofilmsbildning är associerad med minskad känslighet för antibiotika och utvecklandet av antibiotikaresistens. Problemet behöver lösas både genom att både förbygga bildandet av biofilm och genom att utveckla nya sorters antibiotika som påverkar bildandet av biofilm. Antimikrobiella beläggningar på medicinska material minskar andelen bakterier som fäster på ytan av t.ex. katetrar och minskar andelen kateterrelaterade infektioner. Bactiguards beläggningen är ett exempel på en förebyggande metod. Om Bactiguards beläggning coating påverkar själva bildandet av biofilm och produktionen av extracellular polymeric substances (EPS) är ännu inte tillräckligt kartlagt.

Metod: Mängden biofilm som bildats på ytor med Bactiguards beläggning jämfördes med obehandlade ytor genom att färga in EPS. Tre olika bakteriearter odlades separat och tillsammans.

Resultat: Alla tre bakterierarter bildade biofilm på Bactiguardbelaggda ytor, bakterietillväxten var signifikant lägre på de Bactiguard coatade microtiterplattor jämfört med obehandlade mikrotiterplattor. Kvantifiering av EPS lyckades inte. Efter 4-8 h såg kolonialisering av S.epidermidis annorlunda ut på Bactiguard coatade ytor jämfört med obehandlade ytor.

Diskussion: Den antibakteriella effekten hos Bactiguard coatade katetrar verkar vara mer kopplad till en minskning av bakteriernas vidhäftning till ytan. Coatingen behöver optimeras för vidare studier på mikrotiterplattor.

 

Place, publisher, year, edition, pages
2015. , p. 23
Keywords [en]
Biofilm, medical devices, antibacterial coating
National Category
Biomedical Laboratory Science/Technology
Identifiers
URN: urn:nbn:se:hkr:diva-14974OAI: oai:DiVA.org:hkr-14974DiVA, id: diva2:865630
Educational program
Bachelor of Science in Biomedical Laboratory Science
Supervisors
Examiners
Available from: 2015-10-29 Created: 2015-10-28 Last updated: 2015-10-29Bibliographically approved

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