Fast label-free identification of bacteria by synchronous fluorescence of amino acids

TY - JOUR

T1 - Fast label-free identification of bacteria by synchronous fluorescence of amino acids

AU - Shlosberg, Yaniv

AU - Farber, Yair

AU - Hasson, Salah

AU - Bulatov, Valery

AU - Schechter, Israel

N1 - Publisher Copyright: © 2021, Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2021/11

Y1 - 2021/11

N2 - Fast identification of pathogenic bacteria is an essential need for patient’s diagnostic in hospitals and environmental monitoring of water and air quality. Bacterial cells consist of a very high amount of biological molecules whose content changes in response to different environmental conditions. The similarity between the molecular compositions of different bacterial cells limits the possibility to find unique markers to enable differentiation among species. Although many biological molecules in the cells absorb at the UV-Vis region, only a few of them can be detected in whole cells by their intrinsic fluorescence. Among these molecules are the amino acids phenylalanine, tyrosine, and tryptophan. In this work, we develop a rapid method for bacterial identification by synchronous fluorescence. We show that we can quantify the concentration for the 3 amino acids without any significant interference from other fluorophores in the cells and that we can differentiate among 6 pathogenic bacterial species by using the concentrations of their amino acids as a bacterial fingerprint. Fluorescent amino acids exist in all living cells. Therefore, this method has the potential to be applicative for the rapid identification of cells from all kinds of organisms.

AB - Fast identification of pathogenic bacteria is an essential need for patient’s diagnostic in hospitals and environmental monitoring of water and air quality. Bacterial cells consist of a very high amount of biological molecules whose content changes in response to different environmental conditions. The similarity between the molecular compositions of different bacterial cells limits the possibility to find unique markers to enable differentiation among species. Although many biological molecules in the cells absorb at the UV-Vis region, only a few of them can be detected in whole cells by their intrinsic fluorescence. Among these molecules are the amino acids phenylalanine, tyrosine, and tryptophan. In this work, we develop a rapid method for bacterial identification by synchronous fluorescence. We show that we can quantify the concentration for the 3 amino acids without any significant interference from other fluorophores in the cells and that we can differentiate among 6 pathogenic bacterial species by using the concentrations of their amino acids as a bacterial fingerprint. Fluorescent amino acids exist in all living cells. Therefore, this method has the potential to be applicative for the rapid identification of cells from all kinds of organisms.

KW - Amino acids

KW - Bacteria

KW - Identification

KW - Synchronous fluorescence

UR - http://www.scopus.com/inward/record.url?scp=85114371716&partnerID=8YFLogxK

U2 - 10.1007/s00216-021-03642-8

DO - 10.1007/s00216-021-03642-8

M3 - 文章

C2 - 34491394

AN - SCOPUS:85114371716

SN - 1618-2642

VL - 413

SP - 6857

EP - 6866

JO - Analytical and Bioanalytical Chemistry

JF - Analytical and Bioanalytical Chemistry

IS - 27

ER -