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. Author manuscript; available in PMC: 2019 Aug 27.
Published in final edited form as: Aerosol Sci Technol. 2018 Aug 23;52(11):1219–1232. doi: 10.1080/02786826.2018.1500013

Figure 1.

Figure 1.

Formation of aldehydes as a function of the percentage of propylene glycol (PG) in a mixture with vegetable glycerin (VG). A) Saturated aldehydes: formaldehyde and acetaldehyde; B) Unsaturated aldehyde acrolein and acetone (ketone for comparison). To generate aerosols from PG:VG, either neat or mix was loaded into a refillable, clear tank (≈0.5 mL) atomizer with a coil resistance of 1.8-Ohm (Mistic Bridge) coupled with a rechargeable bluPLUS+™ (3.7 V) battery (power output 7.6 W; where puff volume = 91 mL, puff duration = 4 s, frequency = 2 puff/min). Values are means±SD (n=3). In A, *P<0.05: 100% VG vs all % PG ; 75, 50, and 25% PG; + P<0.05: 100% PG vs 75, 50, and 25% PG. In B, *P<0.05: 100% VG vs all % PG; + P<0.05 100% PG vs all % VG.