Nylon Affinity Networks Capture and Sequester Two Model Bacteria Spiked in Human Plasma.

Area of Science:

• Biotechnology
• Medical Microbiology
• Materials Science

Background:

• Bacterial contamination poses a significant risk to blood transfusion safety.
• Current pathogen reduction methods have limitations.
• Novel technologies are needed to improve the safety of blood products.

Purpose of the Study:

• To investigate the efficacy of nylon functionalized with synthetic dyes (nylon affinity networks) for capturing and removing bacteria from plasma.
• To identify the most effective synthetic dye for bacterial capture.
• To evaluate the potential of this technology for enhancing transfusion safety.

Main Methods:

• Screening of 19 synthetic dyes for bacterial capture from spiked phosphate buffer solution (PBS) and human plasma.
• Testing of the optimal dye, Alcian Blue, in sequential capture steps using varying volumes and bacterial concentrations.
• Assessment of bacterial reduction via agar plate cultures.
• Confirmation of bacterial viability on post-treatment affinity networks.
• Identification of captured plasma proteins using liquid chromatography tandem mass spectrometry.

Main Results:

• Alcian Blue demonstrated superior performance in capturing both *Escherichia coli* and *Staphylococcus epidermidis* from PBS and plasma.
• Three sequential capture steps with Alcian Blue affinity networks achieved complete bacterial depletion from plasma.
• Captured bacteria remained viable on the affinity networks.
• A small number of plasma proteins were incidentally captured by the Alcian Blue networks.

Conclusions:

• Nylon affinity networks functionalized with Alcian Blue show significant potential as a pathogen reduction technology for blood plasma.
• This method effectively removes bacteria, thereby enhancing the safety of blood transfusions.
• Further research is warranted to fully assess the clinical applicability and optimize the performance of this technology.