In vitro evaluation of the anti-bacterial effect of two preparations of platelet rich plasma compared with cefazolin and whole blood

Abstract

Purpose. 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 x 103/?L and PRPHP was 867 234.4 x 103/?L. Both PRP products showed a significant decrease (p<0.05) in bacterial growth at 8 hours compared to whole blood. Conclusion. The application of PRPLP and PRPHP showed a significant decrease in bacterial growth after 8 hours for S. aureus, S. epi, MRSA and P.