Before MALDI-TOF mass spectrometry analysis, what is typically required for many organisms?

Before MALDI-TOF mass spectrometry analysis, what is typically required for many organisms?

• A. Growth
• B. PCR amplification
• C. Nucleic acid extraction
• D. Hybridization

Answer: (A)

MALDI-TOF MS identifies organisms from their protein fingerprint, so you need enough cellular material to produce a representative spectrum. That material comes from growing the organism on the right culture medium to form a colony and obtain sufficient biomass. Once you have that, you can prepare the sample and generate the protein spectrum for comparison to a reference database. PCR amplification, nucleic acid extraction, and hybridization are DNA- or RNA-based methods and are not part of the standard MALDI-TOF protein fingerprint workflow, which is why growth to obtain a colony is typically required.

MALDI-TOF MS identifies organisms from their protein fingerprint, so you need enough cellular material to produce a representative spectrum. That material comes from growing the organism on the right culture medium to form a colony and obtain sufficient biomass. Once you have that, you can prepare the sample and generate the protein spectrum for comparison to a reference database. PCR amplification, nucleic acid extraction, and hybridization are DNA- or RNA-based methods and are not part of the standard MALDI-TOF protein fingerprint workflow, which is why growth to obtain a colony is typically required.