Characterization of a rapid condensate collection apparatus for in vitro assays of electronic nicotine delivery systems.

In vitro testing of Electronic Nicotine Delivery System (ENDS) aerosol condensates is important in evaluating their potential toxicity. Collecting sufficient condensate for these tests is a time consuming and costly procedure. The "triple puff (TP)" is a novel system which collects the aerosol from three ENDS devices sequentially into a single filter pad and impinger. The TP substantially reduces condensate collection time relative to the conventional single ENDS, single puff (SP), device system. Both the TP and SP (using two puffing profiles) were used to generate condensates from JUUL ENDS e-liquid Mint 5.0% (nicotine by weight). Aerosols were collected using the filter pad and ethanol-containing impinger method. Condensates produced with the SP and TP were compared for concentrations of primary constituents and carbonyl compounds as well as for their cytotoxicity (OECD 129), mutagenicity (OECD 471) and genotoxicity (OECD 487). Condensates generated with the SP and TP, regardless of puffing regimen, were very similar chemically and equivalent in the biological assays tested (not cytotoxic, mutagenic, or genotoxic). The TP device significantly reduces production time of ENDS condensates relative to the standard SP method and thus may facilitate further research by reducing the time and effort required to collect ENDS condensates.