Synthetic ligand-coated magnetic nanoparticles for microfluidic bacterial separation from blood.
Bacterial sepsis is a serious clinical condition that can lead to multiple organ dysfunction and death despite timely treatment with antibiotics and fluid resuscitation. We have developed an approach to clearing bacteria and endotoxin from the bloodstream, using magnetic nanoparticles (MNPs) modified with bis-Zn-DPA, a synthetic ligand that binds to both Gram-positive and Gram-negative bacteria. Magnetic microfluidic devices were used to remove MNPs bound to Escherichia coli , a Gram-negative bacterium commonly implicated in bacterial sepsis, from bovine whole blood at flows as high as 60 mL/h, resulting in almost 100% clearance. Such devices could be adapted to clear bacteria from septicemic patients.
Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Boston Children's Hospital, Harvard Medical School , Boston, Massachusetts 02115, United States.
Jung-Jae
JJ
Lee
Kyung Jae
KJ
Jeong
Michinao
M
Hashimoto
Albert H
AH
Kwon
Alina
A
Rwei
Sahadev A
SA
Shankarappa
Jonathan H
JH
Tsui
Daniel S
DS
Kohane
D000818:Animals; D001769:Blood / Q000382:microbiology*; D001781:Blood Component Removal / Q000379:methods*; D002417:Cattle; D002469:Cell Separation / Q000379:methods*; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis; D004926:Escherichia coli / Q000302:isolation & purification*; D006440:Hemofiltration / Q000379:methods; D018189:Immunomagnetic Separation / Q000379:methods*; D008024:Ligands; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D046210:Microfluidic Analytical Techniques / Q000379:methods*
D020099:Coated Materials, Biocompatible; D008024:Ligands; D058185:Magnetite Nanoparticles