High-density sample support plate for automated sample aliquoting

Abstract

A sample support plate () for a variety of possible applications, including MALDI mass spectrometry, is disclosed. A plurality of spatially separated sample recipient sites () are arranged on the surface of a substrate. The recipient sites are mutually separated by areas having a different wettability than the recipient sites. They are arranged in a plurality of rows consisting of a plurality of recipient sites whose centers are regularly spaced along a first direction with a predetermined periodicity (D), the rows being regularly spaced along a second direction perpendicular to the first direction with a predetermined centerline distance (D). Each recipient site has a maximum lateral dimension that is preferably smaller than the diameter of a beam spot () of a desorption laser beam (). In order to enable unsupervised splitting of bulk liquid samples into droplets at the sample recipient sites, the periodicity along the first direction and the centerline distance along the second direction are chosen such that each recipient sites has a next neighbor at a distance that is less than or equal to three times the minimum lateral dimension of each recipient site. In preferred embodiments, the sample recipient sites are arranged in a checkerboard-type pattern or in rows that are inclined relative to the edges of the sample support plate.