Sandpaper: Efficient Medium for Analysis of Polishable Solid Samples by Ambient Mass Spectrometry.

In this paper, we employed sandpaper as an efficient medium to analyze polishable solid samples. As proof of principle, the surfaces of coffee beans were sanded with pieces of sandpaper cut into a triangular shape. The triangle was placed in front of the mass spectrometer inlet, and methanol was dropped on its surface.