Shu Taira, Yuki Sugiura, Shinji Moritake, Shuichi Shimma, Yuko Ichiyanagi, Mitsutoshi Setou
Anal. Chem. 2008, 80 (12), 4761–4766
Today, two-dimensional mass spectrometry analysis of biological tissues by means of a technique called mass imaging, mass spectrometry imaging (MSI), or imaging mass spectrometry (IMS) has found application in investigating the distribution of molecules—MSI with matrix-assisted laser desorption/ionization (MALDI) and secondary ion MS (SIMS). However, the size of the matrix crystal and the migration of analytes can decrease the spatial resolution in MALDI, and SIMS can only ionize compounds with relatively low molecular weights. To overcome these problems, we developed a nanoparticle-assisted laser desorption/ionization (nano-PALDI)-based MSI. We used nano-PALDI MSI to visualize lipids and peptides at a resolution of 15 µm in mammalian tissues.