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. 2021 Nov 2;18(21):11520. doi: 10.3390/ijerph182111520

Figure 2.

Figure 2

HPLC-DAD (λ = 360 nm) chromatograms of DNPH-derived carbonyl compounds in e-cigarette emissions for the three different e-liquids at 10 W and 25 W power using a 1.6 Ω coil. The two peaks named “acetaldehyde-DNPH” are isomers. Relevant peaks of unknown chemical identity are labeled “peak1” to “peak7”.