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7 results

  1. TSRC, Tob. Sci. Res. Conf., 2018, 72, abstr. 013

    Method development for pH analysis of ends aerosol and e-liquid

    HEFNER T.(1); ST. CHARLES F.K.(2); ANDERSON J.(3)
    (1) R.J. Reynolds Tobacco Company, Winston Salem, NC, USA; (2) St.Charles Consultancy, Winston Salem, NC, USA; (3) Eurofins Lancaster Labs, Winston Salem, NC, USA
    E-liquids are hygroscopic, non-aqueous liquids containing a small amount of water (~3-15%). When the pH of a non-aqueous liquid is measured using conventional methods and calibration buffers, the value can only be regarded as an "apparent pH". This...
  2. TSRC, Tob. Sci. Res. Conf., 2016, 70, abstr. 77

    A robust method for evaluating the pH of e-liquids

    ST. CHARLES F.K.(1); MOLDOVEANU S.(2); SCOTT W.(2)
    (1) St. Charles Consultancy, Lewisville, NC, USA; (2) R.J. Reynolds Tobacco Co., Winston-Salem, NC, USA
    The measurement of pH is one of the simplest and most common analytical methods practiced in the laboratory. The pH-meter is calibrated using certified buffers, the electrode is placed in the solution, and if a reading is obtained, the value is used....
  3. TSRC, Tob. Sci. Res. Conf., 2014, 68, abstr. 40

    Nicotine activity in tobacco

    ST.CHARLES F.K.(1); MOLDOVEANU S.C.(2)
    (1) St. Charles Consultancy, Lewisville, North Carolina, USA; (2) R.J. Reynolds Tobacco Company, Winston-Salem, North Carolina, USA
    The vapor pressure of pure nicotine has been reported in the literature. However, to the best of our knowledge, measurements of the vapor pressure of nicotine from tobacco have not been reported. Nicotine migration from tobacco to cigarette filters...
  4. TSRC, Tob. Sci. Res. Conf., 2013, 67, abstr. 38

    The migration during storage, transfer to smoke, and filtration efficiency of nicotine, glycerin, and propylene glycol in cigarettes.

    ST. CHARLES F.K.(1); MOLDOVEANU S.C.(2); MILLS H.D.(2); ANDRESEN N.P.(2)
    (1) St.Charles Consultancy, Winston-Salem, NC, USA; (2) R.J. Reynolds Tobacco Co., Winston Salem, NC, USA
    This study evaluated the migration during storage, transfer to smoke and filtration of nicotine, glycerin and propylene glycol (PG) for cigarettes with cellulose acetate/triacetin filters. Filtration efficiency (FE) and smoke yields were studied for...
  5. Beitr. Tabakforsch. Int./Contrib. Tob. Research, 2007, 22-4, p. 290-302., ISSN.0173-783X

    Differences in the chemical composition of the particulate phase of inhaled and exhaled cigarette mainstream smoke

    MOLDOVEANU S.C.; ST. CHARLES F.K.
    R.J. Reynolds Tobacco Company, R&D, Winston-Salem, NC, USA
    In this study, a comparison between the chemical composition of the particulate-phase of exhaled smoke and that of smoke generated with a smoking machine has been performed. For this purpose, eight human subjects smoked a common Lights (10.6 mg...