Abstract
A new method of matrix-assisted laser desorption/ionization (MALDI) sample preparation using a dual-spray electrospray deposition system is demonstrated and employed for the investigation of gas-phase cationization reactions in the MALDI plume. The dual-spray electrospray system is found to increase the homogeneity of the sample similarly to that of a conventional single-spray electrospray system. The dual-spray electrospray system allows for intimate mixing of separately prepared sample components and results in improved quantitative results. The development of this device also leads to the possibility of mixing sample components prepared in different solvents without the need to be concerned with solvent miscibility.
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