posted on 2023-01-03, 12:05authored byAndrew
E. Paulson, W. Ranjith Premasiri, Lawrence D. Ziegler, Young Jin Lee
Spectroscopy and mass spectrometry techniques are sometimes
combined
into the same analytical workflow to leverage each technique’s
analytical benefits. This combined workflow is especially useful in
forensic and medical contexts where samples are often precious in
nature. Here, we adopt metal nanoparticle (NP) doped sol–gel
substrates, initially developed for surface-enhanced Raman scattering
(SERS) analysis, as surface-assisted laser desorption/ionization–mass
spectrometry (SALDI-MS) substrates. Using dried blood and sample protocols
previously developed for SERS analysis, we observe heme-related spectral
features on both silver and gold NP substrates by SALDI-MS, demonstrating
dual functionality for these orthogonal techniques. Modifying the
dried blood extraction procedures also allows for the observation
of blood triacylglycerols by SALDI-MS. This is the first demonstration
of a SERS/SALDI-MS substrate based on a sol–gel scaffold and
the first demonstration of a gold NP sol–gel substrate for
SALDI-MS which features lower substrate-related SALDI-MS background
compared to the silver substrate.