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Updated: Jun 12, 2025
Treatment of Platelet Products with Riboflavin and UV Light: Effectiveness Against High Titer Bacterial Contamination
Published on: August 24, 2015
Evaluation of riboflavin concentrations and light intensities on bacteria reduction in platelets using visible light
Hong Liu1, Qin Mo1, Jianhao Yang1
1Department of Transfusion-transmitted Infectious Disease, Shanghai Institute of Blood Transfusion, Shanghai Blood Center, Shanghai 200051, China.
Abstract:
Bacterial contamination in platelets has been a major concern over the years. In this study, we showed that treatment with 420 nm visible light with various concentrations of riboflavin in platelets reduced E. coli and S. aureus by 0-1.56 and 0.3-2.02 logs (50 mW/cm2), 2.24-4.77 and 0.73-3.26 logs (75 mW/cm2), and ≥ 5.14 and ≥ 5.27 logs (100 mW/cm2). Treatment with high-intensity light (100 mW/cm2) and high concentrations of riboflavin (400 µM and 500 µM) effectively reduced both bacteria in platelets by over 4 logs. The study also found a positive correlation between bacterial reduction and light intensity, as well as riboflavin concentration in a dose-dependent manner. These results demonstrate the potential of using riboflavin and visible light to reduce the risk of bacterial contamination in platelets, and support the need for further exploration of pathogen reduction using 420 nm visible light and riboflavin.
Insights
Riboflavin and visible light effectively reduce bacterial contamination in platelets. This pathogen reduction method shows promise for improving blood product safety by decreasing E. coli and S. aureus levels.
Area of Science:
- Biomedical Science
- Blood Product Safety
- Microbiology
Background:
- Bacterial contamination in platelet transfusions poses a significant risk to patient safety.
- Effective methods for pathogen reduction in platelets are crucial for transfusion medicine.
Purpose of the Study:
- To evaluate the efficacy of 420 nm visible light and riboflavin in reducing bacterial contamination in platelets.
- To determine the correlation between light intensity, riboflavin concentration, and bacterial log reduction.
Main Methods:
- Platelets were treated with varying concentrations of riboflavin and exposed to 420 nm visible light at different intensities (50, 75, and 100 mW/cm²).
- The reduction of E. coli and S. aureus in treated platelets was quantified using log reduction values.
Main Results:
- Treatment with 420 nm visible light and riboflavin significantly reduced E. coli and S. aureus in platelets.
- High-intensity light (100 mW/cm²) and high riboflavin concentrations (400-500 µM) achieved over 4-log reduction for both bacteria.
- Bacterial reduction demonstrated a dose-dependent relationship with both light intensity and riboflavin concentration.
Conclusions:
- Riboflavin and visible light treatment is a potentially effective strategy for reducing bacterial contamination in platelets.
- This pathogen reduction technology warrants further investigation for enhancing the safety of platelet transfusions.
