Mass spectrometry analysis of microorganisms in samples

A method for capturing a target analyte from a sample, the method comprising:

• providing a product comprising a capture module configured to capture a target analyte from a sample, wherein the capture module comprises a porous substrate that is held between a top and bottom portion of a cartridge and an electrode, the top and bottom portion sandwiching the porous substrate and each having an opening therein such that a portion of the porous substrate is exposed when the porous substrate in held in the cartridge and the electrode contacting the porous substrate when the porous substrate in held in the cartridge;
• and
• moving air or liquid through the exposed portion of the porous substrate such that any target analyte in the air or liquid is retained and captured by the porous substrate.