Abstract: A method of preparing a sample for matrix assisted laser desorption ionization mass spectrometry imaging analysis by a two-step process. Firstly, a MALDI matrix is dusted on to the sample followed by a spray of a suitable solvent onto the dusted sample. The present method has been successfully applied to the detection and mapping of several analyte classes in latent fingermarks. Using the present two-step method, fingermark enhancement, recovery and analysis from different substrate surfaces is now possible enabling visual and chemical information to be obtained simultaneously via remote testing.

Abstract: A method of categorising a human according to pre-determined categories using Matrix Assisted Laser Desorption Ionisation Mass Spectrometry (MALDI-MS) is disclosed. A method is provided to discriminate humans based on gender, for example, by comparing MALDI-MS sample spectral data in the m/z range 2,000 to 30,000 and comparing these sample spectral data with reference spectral data obtained from pre-categorised humans.

Abstract: A method of preparing a sample for matrix assisted laser desorption ionisation mass spectrometry imaging analysis by a two-step process. Firstly, a MALDI matrix is dusted on to the sample followed by a spray of a suitable solvent onto the dusted sample. The present method has been successfully applied to the detection and mapping of several analyte classes in latent fingermarks. Using the present two-step method, fingermark enhancement, recovery and analysis from different substrate surfaces is now possible enabling visual and chemical information to be obtained simultaneously via remote testing.