Skip to main content

Table 1 E-liquid RM homogeneity and stability testsa

From: Universal electronic-cigarette test: physiochemical characterization of reference e-liquid

Variable Sub-sample 1 Sub-sample 2 Sub-sample 3 S.D. # of liquid phase
Nicotine concentration (mg/ml)
Homogeneity test (1:1)
 5 min 10.65 9.19 8.93 0.92 2
 20 min 9.90 9.79 9.55 0.17 2
 1 h 9.69 10.00 9.78 0.15 1
Homogeneity test (8:2)
 5 min 10.41 10.29 10.23 0.31 2
 20 min 10.48 10.53 11.82 0.66 2
 1 h 10.89 10.61 11.00 0.20 1
Homogeneity test (2:8)
 5 min 9.28 8.49 7.98 0.59 2
 20 min 9.63 8.44 9.63 0.64 2
 1 h 9.73 9.36 8.33 0.73 1
 3 h 9.54 8.91 9.14 0.32 1
 6 h 10.99 9.88 11.18 0.70 1
Stability test (1:1) (thermocycler)
 24 h 9.97 10.02 10.00 0.02 1
 72 h 9.98 10.04 10.05 0.03 1
Absorbance (490 nm)
Stability test (1:1) (spectrophotometer)
 Day 0 11.99 12.12 12.13 1 1
 1 month 26.29 26.08 25.95 2.14 1
 6 month 200.84 198.28 188.69 16.20 1
  1. a1:1 propylene glycol/glycerin = 50% propylene glycol and 50% glycerin by volume prepared using mass
  2. 8:2 propylene glycol/glycerin = 80% propylene glycol and 20% glycerin by volume prepared using mass
  3. 2:8 propylene glycol/glycerin = 20% propylene glycol and 80% glycerin by volume prepared using mass