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e development of a novel type of a sampling/ionization kit for use in electrospray ionization/mass spectrometry is reported. Using a small calligraphy-brush-style synthetic hair pen (nylon-brush), and analogous to paper-spray mass spectrometry, the analytes can be collected, elution/desorption and then ionized from the surface of the nylon-brush. e body of the kit was produced by means of a commercial 3D-printer, in which ABS (acrylonitrile butadiene styrene) was used as the starting material. Meanwhile, a small nylonbrush was embedded inside a 3D-printed plastic cell, in which a solvent was supplied to rinse the brush by means of capillary action. e size and weight of the kit were 1 g and 4 cm, respectively. e kit is disposable and it has various functions, including non-invasive sampling, sample-evaporation and ionization. As a result, when a type of pesticide was selected as the test sample (dimethoate; C 5 H 12 NO 3 PS 2 ), the limit of detection was determined to be 0.1 µg/mL. Collecting the pesticide from a leaf-surface (lettuce) was also successful. e process for fabricating the nylon-brush kit and the optimized experimental conditions are reported herein.

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