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According to the normal production conditions, 13 kinds of n-alkanes were added to the core material sheet production process to prepare heated tobacco products, and a GC-MS analysis method suitable for re-alkanes in the core material, filter and mainstream smoke particulate matter of heated tobacco products was established. The transfer behavior of re-alkanes in heated tobacco products was studied by measuring the content, release and mouth-to-mouth release of re-alkanes in heated tobacco products. The results showed that: 1) The particle phase transfer rates of 13 re-alkanes in mainstream smoke were 0~53. 5 %, the filter interception rate was 12. 6% ~ 50. 0%, the smoke support retention rate was 0. 2% ~ 35. 4%, the smoke core residue rate was 6. 4% ~ 29. 3%, and the loss rate was 0. 6% ~ 81. 5%; With the increase of relative molecular mass and boiling point, the transfer rate of particulate matter and the interception rate of filter in mainstream smoke of n-alkane compounds increased first and then decreased, the residual rate of cigarette core increased gradually, and the retention rate of cigarette support increased first and then stabilized. The smoke retention rate and filter rejection rate showed a good positive correlation with the boiling point of the compound within a certain range. 2) With the increase of the number of suction ports, the release amount of re-alkanes increased first and then decreased, but the order of the maximum release amount was inconsistent. The lower the boiling point of the compound, the earlier the order of the maximum release amount. 3) The coefficient of variation of the puff-by-puff release of re-alkanes ranged from 0. 28 to 0. 44. The coefficient of variation of the puff-by-puff release of tridecane ( boiling point 235°C) and tetradecane ( boiling point 254 °C) was small, and the puff-by-puff release stability was good. Based on the evaluation data of the retention rate of re-alkanes in heated tobacco products, the transfer rate of particulate matter in mainstream smoke, and the stability of puff-by-puff release, the boiling point range of additives suitable for heated tobacco products was proposed to be about 250 °C. [ABSTRACT FROM AUTHOR]

In order to study the influence of filter ventilation of heated tobacco products on aerosol released, 1#--5# heated tobacco products samples with 0, 2, 4, 6, and 8 ventilation holes set at cavity section of filter were prepared. With an in-situ aerosol characterization method with microprobe sampling and a thermocouple temperature measurement method, the effects of ventilation on the physical properties and temperature of aerosol were investigated and analyzed. The results showed that filter ventilation changed the particle size distribution of aerosol in heated tobacco products. The particle number concentration and volume concentration of aerosol behind ventilation holes in heated tobacco products decreased with the increase of the number of ventilation holes. The reduction rate of particle volume concentration of aerosol from sample 5# was 57. 4% compared with sample 1#. Ventilation reduced the count median diameter of aerosol. However, the change of count median diameter with the number of ventilation holes was not significant. The temperature of aerosol in front of and behind ventilation holes decreased with the increase of the number of ventilation holes. The aerosol temperature of sample 5# was 23. 0 °C lower than that of sample 1#. The particle volume concentration and temperature of aerosol in front of and behind ventilation holes were higher at the central axis and lower along the radial distance. [ABSTRACT FROM AUTHOR]

Normal and slim cigarettes with different filter ventilation and cigarette paper air permeability were rolled. The effects of filter ventilation, cigarette paper ventilation and ventilation distribution on nine phenolic aroma components release from mainstream cigarette smoke were investigated. The results showed the filter ventilation rate, paper ventilation rate negatively correlated to the releases of nine phenolic aroma components in cigarette smoke, and with the increase of ventilation rate, the decrease rate of maltol with caramel flavour and smaller molecular weight was higher, while the decrease rate of eugenol with smoky flavor and larger molecular weight was lower. No matter normal or small cigarettes, the paper and filter ventilation rate have different effects on the decrease of smoke composition, and the paper ventilation rate has greater influence than the filter ventilation rate. The effects of filter ventilation rate, paper ventilation rate and ventilation distribution on the release of nine phenolic aroma components in conventional cigarette smoke were greater than those in slim cigarette smoke. When the total ventilation rate was the same, the release of 9 phenolic aroma components in cigarette smoke with high filter ventilation rate and low paper ventilation rate was higher than that with low filter ventilation rate and high paper ventilation rate. [ABSTRACT FROM AUTHOR]

In order to investigate transfer behavior of six ester flavors in aerosol of heated tobacco products, puff-by-puff release of six ester compounds in the aerosols of heated tobacco products and the content in cut tobacco was measured using GC-MS at the addition levels of 0.01% and 0.05% respectively. The transfer rates of six ester flavors in the aerosols of heated tobacco products were analyzed. The results showed that with the increase of puff number, the puff-by-puff releases of six ester flavors in aerosol of heated tobacco products showed a trend of first increasing and then decreasing. And the maximum of puff-by-puff transfer release was mainly between the third and fifth puff. The puff-by-puff transfer rate of six ester flavors was 0.70%~8.06%, and the total transfer rate of six ester flavors was between 10.50% and 52.98%. There was a good linear positive correlation between the sum of puff-by-puff transfer rate and the puff number. [ABSTRACT FROM AUTHOR]

20 kinds of electrically heated cigarettes from 5 brands in the market were collected to characterize and compare the physical properties (number concentration, count median diameter and volume concentration) of total and puff-by-puff released aerosol. The results showed that the particle number concentration of the total aerosol released from the electrically heated cigarette was mainly in the order of 109/cm³, and the particle volume concentration was in the order of 105 μm³/cm³. The particle size distribution profiles of aerosol were unimodal or bimodal, and the count median diameter was mainly in the range of 30~60 nm. There were obvious differences in physical properties of total and puff-by-puff release of the aerosol from different brands of electrically heated cigarettes. The particle number concentration, count median diameter and volume concentration of the aerosol puff-by-puff released from the electrically heated cigarettes showed a certain degree of instability. [ABSTRACT FROM AUTHOR]

The migration of six flavourings to smoke aerosols and their effects on the physical and chemical properties of aerosols under heating condition were studied by using a smoking machine, combined with GC- MS/MS and fast particulate spectrometer. The results showed that; 1) The six flavourings were mainly evaporated by prototype at 350 °C. 2) The release and migration of the six flavourings showed different characteristics under heating and suction conditions. Isoamyl isovalerate and 2,3,5-trimethylpyrazine were transferred to particle phase and gas phase of aerosol, while the other four flavourings were only transferred to particle phase of aerosol. The total migration rates of geraniol and 2-acetylpyrrole to smoke aerosol were 2.8%~8.1%, and the other four flavourings were 17.6%~54.4%.3) Compared with the blank control, after adding 5% L-menthol or 1% and 2% WS-23, the release amount of nicotine, propylene glycol and glycerol from the tobacco materials to the aerosol was reduced by more than 20%, and their interception in the filter section was reduced by more than 10%. 4) When L-menthol was added to 5%, the particle number concentration decreased by 28% and count median diameter (CMD) increased by 8%. [ABSTRACT FROM AUTHOR]

In order to investigate the effect of different ventilation distribution on organic acid release from mainstream smoke of slim cigarette, the slim cigarette samples with different filter ventilation and cigarette paper air permeability were rolled, and the organic acid in mainstream smoke of samples were analyzed by GC-MS, the prediction models of organic acids release based on both filter and paper ventilation rate were established. The results were as follows: 26 kinds of organic acids were detected. With the increase of filter ventilation rate or paper ventilation rate, the decrease rate of organic acids with smaller molecular weight was higher, while that with larger molecular weight was smaller, and the effect of paper ventilation rate on the release of organic acids in cigarette smoke was greater than that of filter ventilation rate. When the total ventilation rate (V) was constant, the release of organic acids in cigarette smoke with high filter ventilation rate and low paper ventilation rate was higher than that with low filter ventilation rate and high paper ventilation rate. The prediction accuracy of the model of organic acid release was high, and the results further proved that the cigarette organic acid release was higher with the combination of high filter ventilation rate and low paper ventilation rate. [ABSTRACT FROM AUTHOR]

In order to investigate the puff-by-puff discipline of flavor components in the mainstream cigarette smoking, a 20-channel rotary disc smoker modified from a patent in laboratory was used to achieve the puff-by-puff smoking of cigarettes. A GC-MS quantitative analysis method for neutral and alkaline flavor components in single-mouthful particulate phase of mainstream cigarette smoke was established. By using the established analytical method, the puff-by-puff delivery discipline of flavor components and the effects of the permeability of cigarette paper and packaging paper were studied. The results showed that: 1) The established analytical method had a good precision and recovery and was suitable for the quantitative analysis of neutral and alkaline aroma substances in single-mouthful gaseous and granular phase of cigarette smoke. 2) The transport capacity of tar and nicotine in the mainstream cigarette smoke steadily increased with the increase in the number of suction mouths, and decreased with the increase in the permeability of cigarette paper and packaging paper. 3) The transmission of neutral and alkaline aroma components increased with the increase in the number of suction mouths, but the transmission of various flavor components was slightly different, and decreased with the increase of the permeability of cigarette paper and packaging paper. 4) The puff-by-puff contents of neutral and alkaline aroma components in gaseous and granular phase of the mainstream smoke per unit tar and nicotine were the lowest in the first puff, and then were in line with the number of suction puffs. [ABSTRACT FROM AUTHOR]

The CHIRALPAK-IC was used, and the mixed solution of V (re-hexane) : V (isopropanol) = 95 : 5 was used as the mobile phase, and diethylamine was used as the mobile phase additive. In normal phase chromatography mode, a chiral column-high performance liquid chromatography-diode array detector (HPLC-DAD ) method was developed for the separation and analysis of nicotine optical isomers in tobacco and tobacco products. The characterization and test results of this method indicated:) The linear relationship between S-( -)-nicotine and R-( +)-nicotine was in the range of 15 ~750 µg/mL and 0. 75 ~30. 00 µg/mL, respectively. The detection limit and limit of quantification were 0.2 mg/g and 0. 05 mg/g, respectively. 2) The precision of intra- and inter-day measurements of nicotine was less than 0. 85% and 4. 00%, respectively; the recovery rates of S-( - ) -nicotine and R-( + ) -nicotine were 94. 93% ~ 103. 70% and 92. 50% ~ 117. 50%, respectively. This indicated that the method had good precision and high recovery rate. Using this method to determine the nicotine optical isomers of 26 different types of tobacco and tobacco products, it was found that tobacco was mainly S-( - )-nicotine, only 6 samples were detected by R-( + )-nicotine. The proportion of nicotine quality was 0. 18% ~0.70% ; among the 10 finished cigarettes and their mainstream smoke, the proportion of R-( + )-nicotine in total cigarette smoke was higher than that of cigarette tobacco. [ABSTRACT FROM AUTHOR]