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A microfluidic device comprising an MS-analyte presentation unit for a EDI-MS apparatus, said unit comprising an essentially planar support plate which on one side has one, two or more ports (MS-ports) comprising an area (EDI area) for presenting the MS-analyte to a mass spectrometer. The EDI area c

A microfluidic device comprising an MS-analyte presentation unit for a EDI-MS apparatus, said unit comprising an essentially planar support plate which on one side has one, two or more ports (MS-ports) comprising an area (EDI area) for presenting the MS-analyte to a mass spectrometer. The EDI area comprises a layer I of conducting material. The characteristic feature of the device is that layer (I) has a conductive connection and/or that there is a calibrator area in the proximity of the MS-port.

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1. A microfluidic device in the foam of a disc comprising one, two or more MS-ports for the presentation of an MS-analyte to an EDI-MS apparatus, wherein each of said MS-ports being part of a microchannel structure comprising an inlet port for a sample, wherein each of said microchannel structures a

1. A microfluidic device in the foam of a disc comprising one, two or more MS-ports for the presentation of an MS-analyte to an EDI-MS apparatus, wherein each of said MS-ports being part of a microchannel structure comprising an inlet port for a sample, wherein each of said microchannel structures are oriented radially in the disc and arranged annularly around a spinning axis of the disc; and comprising an area (EDI area) for presenting the MS-analyte to a mass spectrometer, said EDI area comprising a layer I of conducting material having a conductive connection and/or a calibrator area in the proximity of the MS-port. 2. The microfluidic device of claim 1, wherein there are two or more EDI areas and layer (I) of each EDI area is part of a common continuous conducting layer. 3. The microfluidic device of claim 1, wherein layer (I) it covered by a non-conducting layer (layer II). 4. The microfluidic device of claim 3, wherein there are two or more EDI areas and layer (U) of each EDI area is part of a common continuous non-conducting layer. 5. The microfluidic device of claim 1, wherein layer (1) is exposed in the MS-port at the surface of the EDI area, or embedded in the EDI area below said surface, or exposed at the bottom of the device. 6. The microfluidic device of claim 1, wherein the microchannel structuresare covered by a lid which may or may not have an opening above an EDI area. 7. The microfluidic device of claim 6, wherein said lid is removable. 8. The microfluidic device of claim 6, wherein said lid comprises a common conducting layer including the connection for electricity and an opening above each of the EDI areas. 9. The microfluidic device of claim 1, wherein the sample inlet port is at an inner position and the MS-post it at an outer position in each of said microchannel structures. 10. The microfluidic device of claim 1, wherein EDI is LDI. 11. The microfluidic device of claim 10, wherein LDI is MALDI.