Which technology is often used for rapid species identification by analyzing protein mass spectra?

• A. PCR
• B. Multiplex PCR
• C. MALDI-TOF MS
• D. Nanoparticle probe technology

Answer: (C)

When you want rapid species identification from a protein profile, MALDI-TOF MS is the go-to technology. It works by ionizing abundant cellular proteins and measuring their mass-to-charge ratios to generate a spectrum that serves as a fingerprint for the organism. That spectrum is quickly compared to a reference database to identify the species, often within minutes once you have a sample. This approach is fast, scalable, and cost-effective for routine identification of bacteria and fungi, since it relies on characteristic protein fingerprints rather than genetic amplification.

In contrast, PCR-based methods detect specific DNA sequences and require primers and amplification, focusing on genetic information rather than protein fingerprints. Nanoparticle probe technologies use different sensing principles and do not produce the protein mass spectra used for rapid identification.