Abstract
Abstract Collaborative study was carried out on a method for determination of propylene glycol, glycerol, and triethylene glycol in tobacco. The method involves gas chromatography of the methanolic extract of tobacco on a 42 × 3/16″ column packed with 5% Carbo wax 20M-terephthalic acid on 60-80 mesh 1:1 Diatoport S-Chromosorb 101 mixed support. 1,3-Butylene glycol is used as an internal standard. The oven temperature is programmed from 90 to 240°C at 15°/min. Results for propylene glycol and glycerol gave coefficients of variation <10%. Results for triethylene glycol in cut tobacco at mean concentration levels of 0.95 and 1.30% gave coefficients of variation of 9.24 and 6.93%, respectively. At a mean concentration level of 0.54% triethylene glycol, the coefficient of variation was 20.8%. The method has been adopted as official first action.
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