{'fraction_non_alphanumeric': 0.012034383954154728, 'fraction_numerical': 0.001146131805157593, 'mean_word_length': 5.7153846153846155, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Effects of different tobacco materials on the release characteristics of aroma components

In order to reveal the release characteristics of different tobacco materials, the characteristics of tobacco materials and the release characteristics of smoke were analyzed. This paper studied 17 kinds of tobacco materials, the thermogravimetric analyzer was used to study the thermogravimetric characteristics of the tobacco materials, meanwhile the gas chromatography was used to analysis original aroma composition characteristics of the raw tobacco material, the smoke released from the pyrolysis of tobacco in a fixed bed reactor was also studied. The results showed: ① The elemental composition of different kinds of tobacco materials was similar, but there were significant differences in the volatile content (aroma components), among which the aroma components of tobacco stem were the highest. ②Different categories of tobacco raw materials have different properties of the aroma components. Among them, the nicotine content of roasted tobacco was higher, spice tobacco and tobacco stems mainly contain acid and ketone aroma components. However, burley tobacco and cigar tobacco are distinguished from other types of tobacco by the presence of aromatic substances such as new phytodiene.③ Through the analysis of thermal release characteristics of aroma components of different tobacco raw materials, it was found that the yield of aroma components was positively correlated with the volatile content of tobacco materials. The results of this study clarified the effects of different tobacco raw materials on the release characteristics of aroma components and provided theoretical guidance for the subsequent compound utilization of tobacco.