title: Gentamicin palmitate as a new antibiotic formulation for mixing with bone tissue and local release.
abstract: During surgery with bone grafting, the impaction of bone tissue creates an avascular area where local circulation is disrupted. If infections arise, they may prevent systemically administered antibiotics from reaching the infected bone. In this study we evaluated gentamicin palmitate (GP) mixed with gentamicin sulfate (GS) as a coating for bone chips (BCh). The efficacy of the coated BCh was measured by gentamicin base release tests using B. subtilis, S. epidermidis and S. aureus. Gentamicin base release was evaluated in phosphate-buffered saline for up to 7 days using B. subtilis bioassay. Antimicrobial efficacy was tested with S. aureus and S. epidermidis. A significant difference on the release of gentamicin base between GS and GS + GP was observed. S. epidermidis are significantly more susceptible to GS + GP and GS than S. aureus. BCh can act as gentamicin carriers and showed efficacy against S. aureus and S. epidermidis.
authors.affiliation: Experimental Orthopaedics, Medical University Innsbruck, Salurner Strasse 15, 6020, Innsbruck, Austria, debora.coraca-huber@i-med.ac.at.
authors.forename: Débora C
authors.initials: DC
authors.lastname: Coraça-Huber
authors.forename: David
authors.initials: D
authors.lastname: Putzer
authors.forename: Manfred
authors.initials: M
authors.lastname: Fille
authors.forename: Johann
authors.initials: J
authors.lastname: Hausdorfer
authors.forename: Michael
authors.initials: M
authors.lastname: Nogler
authors.forename: Klaus-Dieter
authors.initials: KD
authors.lastname: Kühn
mesh_terms: D064591:Allografts; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D019072:Antibiotic Prophylaxis / Q000379:methods*; D001412:Bacillus subtilis / Q000187:drug effects; D016025:Bone Transplantation / Q000379:methods*; D001842:Bone and Bones / Q000382:microbiology*; D004203:Disinfection; D005839:Gentamicins / Q000494:pharmacology*; D016908:Gram-Positive Bacterial Infections / Q000188:drug therapy / Q000517:prevention & control*; D006801:Humans; D008826:Microbial Sensitivity Tests; D013203:Staphylococcal Infections / Q000188:drug therapy / Q000517:prevention & control; D013211:Staphylococcus aureus / Q000187:drug effects; D013212:Staphylococcus epidermidis / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D005839:Gentamicins