TY - JOUR T1 - 855 Dermal exposure to diisocyanates: development and validation of an analytical method for accurately assessment of very low levels of exposure JF - Occupational and Environmental Medicine JO - Occup Environ Med SP - A415 LP - A415 DO - 10.1136/oemed-2018-ICOHabstracts.1185 VL - 75 IS - Suppl 2 AU - Radu-Corneliu Duca AU - Matteo Creta AU - Katrien Poels AU - Lode Godderis AU - Jeroen Vanoirbeek Y1 - 2018/04/01 UR - http://oem.bmj.com/content/75/Suppl_2/A415.1.abstract N2 - Introduction Dermal exposure to sensitizers such as diisocyanate have been described to promote the development of asthma in later stages when respiratory occupational exposure occurs. Therefore, we developed a reliable, sensitive and validated methodology based on dermal patches to assess skin exposure to diisocyanates.Methods An UPLC-Unispray-MS/MS method was established and validated in order to reach very low levels of detection. Custom-made dermal patches were developed in order to allow optimal sampling of diisocyanates. Their sampling capability was evaluated in a controlled environment test-chamber were patches were exposed to increasing concentrations of diisocyanates.Result The UPLC-MS/MS method using a Unispray ionisation source, based on supercritical fluids ionisation and Coanda effect, allowed reaching very low levels of detection (LoD=1 pg/mL) for all the targeted compounds (i.e. 4,4-MDI, 2,4-MDI, 2,6-TDI, 2,4-TDI, 1,6-HDI, and IPDI). Due to the high sensitivity of the analytical method, very low levels of diisocyanates (i.e. 25 pg/patch) are detected on the custom-made dermal patches. Furthermore, the patches allowed the sampling of a broad range of concentration levels (from 5 pg/cm2 to 5 ng/cm2), which have been correlated with the air levels from the controlled environment chamber-test.Discussion We succeeded to develop a method to assess dermal exposure to diisocyanates. Field studies are now necessary to further evaluate the suitability of the custom-made patches, as well as to relate low levels of exposure and potential health outcomes. ER -