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TSRC, Tob. Sci. Res. Conf., 2022, 75, abstr. 33

Use of DNPH-HCL for derivitization and analysis of carbonyls in electronic nicotine delivery systems (liquid and aerosol) and aerosol from heated tobacco products

ROBERTS R.; BRANDE C.; LINDSAY L.; WATTS M.; VANCE S.; SEAMANS A.; ADAMS C.J.; CHOUCHANE S.
Eurofins Professional Scientific Services, Winston-Salem, NC, USA

Carbonyl compounds, found in e-liquid, in aerosol of heated tobacco products (HTP) or electronic Nicotine delivery systems (ENDS) are monitored as harmful and potentially harmful constituents. To analyze carbonyls, a derivatizing agent known as 2,4-dinitrophenyl hydrazine (DNPH) is typically used; however, due to the current worldwide shortages, we examined and investigated an alternative derivatization agent, DNPH-HCl salt. One challenge we observed during the conversion from the free base form of DNPH to the DNPH salt is that is resulted in low recoveries of Acrolein. As a result, the solution was buffered using citric acid to prevent the acid promoted poly-derivatization. The DNPH-HCl in citrate buffer pH 6.0 extraction solution used to trap carbonyls showed the best performance and resulted in consistent recoveries with a more readily available DNPH source. In addition, the DNPH-HCl is a safer compound to work with and has the added benefit that the acidification process reduces observed background levels that can be attributable to the synthesis/purification of the DNPH. The validation results of this method will be reported.