title: In vitro evaluation of the anti-bacterial effect of two preparations of platelet rich plasma compared with cefazolin and whole blood.
abstract: OBJECTIVE
  This study investigates the antibacterial properties of two different platelet-rich plasma (PRP) platelet concentration preparations (PRPLP and PRPHP) through a time-kill assay.
  
  
  METHODS
  Two different PRP preparations - a single spin process yielding lower white blood cells and platelet concentration (PRPLP) and one yielding high platelet and white blood cell concentration (PRPHP) - were obtained from 2 individuals. PRPLP, PRPHP, phosphate buffered saline (PBS), whole blood and Cefazolin were added to experimental reaction tubes, each containing a single bacterial inoculum of Staphylococcus aureus (S. aureus), Staphylococcus epidermidis (S. epi), methicillin-resistant Staphylococcus aureus (MRSA) or Propionibacterium acnes (P. acnes). Two dilutions (1:1,000, and 1:10,000) were plated in duplicate tubes, along with positive (blood and PBS) and negative (Cefazolin) controls and assessed at five time points (0, 1, 4, 8 and 24 hours).
  
  
  RESULTS
  After centrifugation, platelet count of PRPLP was 386 ± 65.5 × 103/?L and PRPHP was 867 ± 234.4 × 103/?L. Both PRP products showed a significant decrease (p<0.05) in bacterial growth at 8 hours compared to whole blood.
  
  
  CONCLUSIONS
  The application of PRPLP and PRPHP showed a significant decrease in bacterial growth after 8 hours for S. aureus, S. epi, MRSA and P. acnes compared to the whole blood control group. S.epi, MRSA, and P. acnes also showed a significant decrease in bacterial growth after 24 hours. Despite differences in platelet concentration and WBC concentration, no difference in antibacterial activity was seen between the two preparations.
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Jessica
authors.initials: J
authors.lastname: Intravia
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Donald A
authors.initials: DA
authors.lastname: Allen
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Thomas Js
authors.initials: TJ
authors.lastname: Durant
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Mary Beth R
authors.initials: MB
authors.lastname: McCarthy
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Ryan
authors.initials: R
authors.lastname: Russell
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Knut
authors.initials: K
authors.lastname: Beitzel
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Mark P
authors.initials: MP
authors.lastname: Cote
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Feliciano
authors.initials: F
authors.lastname: Dias
authors.affiliation: Department of Orthopaedic Surgery, UCONN Health Center, Farmington, USA.
authors.forename: Augustus D
authors.initials: AD
authors.lastname: Mazzocca
keywords: PRP; antibacterial; antimicrobial; platelet-rich plasma