Matrix-assisted laser desorption ionization-time of flight mass spectrometry for the discrimination of food-borne microorganisms.
A methodology based on matrix-assisted laser desorption ionization-time of flight mass spectrometry of intact bacterial cells was used for rapid discrimination of 24 bacterial species, and detailed analyses to identify Escherichia coli O157:H7 were carried out. Highly specific mass spectrometric profiles of pathogenic and nonpathogenic bacteria that are well-known major food contaminants were obtained, uploaded in a specific database, and made available on the Web. In order to standardize the analytical protocol, several experimental, sample preparation, and mass spectrometry parameters that can affect the reproducibility and accuracy of data were evaluated. Our results confirm the conclusion that this strategy is a powerful tool for rapid and accurate identification of bacterial species and that mass spectrometric methodologies could play an essential role in polyphasic approaches to the identification of pathogenic bacteria.
Mazzeo
Maria Fiorella
MF
Proteomic and Biomolecular Mass Spectrometry Center, Institute of Food Science and Technology, CNR, via Roma 52 a/c, 83100 Avellino, Italy.
Sorrentino
Alida
A
Gaita
Marcello
M
Cacace
Giuseppina
G
Di Stasio
Michele
M
Facchiano
Angelo
A
Comi
Giuseppe
G
Malorni
Antonio
A
Siciliano
Rosa Anna
RA
D001419:Bacteria / Q000737:chemistry / Q000145:classification* / Q000302:isolation & purification / Q000472:pathogenicity; D001426:Bacterial Proteins / Q000302:isolation & purification; D001431:Bacteriological Techniques / Q000592:standards; D016208:Databases, Factual; D019453:Escherichia coli O157 / Q000737:chemistry / Q000302:isolation & purification; D005516:Food Microbiology; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods* / Q000592:standards
D001426:Bacterial Proteins