Photoacoustic Flow Cytometry Using Functionalized Microspheres for Selective Detection of Bacteria

DOI

10.3390/mi14030573

Document Type

Journal Article

Publication Date

3-1-2023

Publication Title

Micromachines

Volume

14

Issue

3

Keywords

acoustic, biosensing, optoacoustics

Abstract

Photoacoustic flow cytometry is a method to detect rare analytes in fluids. We developed photoacoustic flow cytometry to detect pathological cells in body fluids, such as circulating tumor cells or bacteria in blood. In order to induce specific optical absorption in bacteria, we use modified bacteriophage that precisely target bacterial species or subspecies for rapid identification. In order to reduce detection variability and to halt the lytic lifescycle that results in lysis of the bacteria, we attached dyed latex microspheres to the tail fibers of bacteriophage that retained the bacterial recognition binding sites. We tested these microsphere complexes using Salmonella enterica (Salmonella) and Escherichia coli (E. coli) bacteria and found robust and specific detection of targeted bacteria. In our work we used LT2, a strain of Salmonella, against K12, a strain of E. coli. Using Det7, a bacteriophage that binds to LT2 and not to K12, we detected an average of (Formula presented.) of LT2 versus (Formula presented.) of K12 using red microspheres and (Formula presented.) of LT2 versus (Formula presented.) of K12 using blue microspheres. These results confirmed our ability to selectively detect bacterial species using photoacoustic flow cytometry.

Open Access

Gold

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