卷烟主流烟气酸香特征成分组群的分布特征及感官贡献

为阐明卷烟主流烟气中具有酸香特征且可用于卷烟调香的有机酸成分及其分布特征和感官贡献,以《The chemical components of tobacco and tobacco smoke》中所列出的烟草和烟气成分为数据来源,从烟气中是否存在、香气贡献可能性和烟草添加剂使用安全性等方面对其中的有机酸成分进行了系统筛查,对筛查出的有机酸进行香气特征评价,明确了21种卷烟主流烟气中具有酸香特征且可能作为烟用香料的有机酸成分;采用N,O-双(三甲基硅基)三氟乙酰胺衍生化法和GC-MS法测定了21种酸香成分在14个品牌卷烟主流烟气中的释放量及在烟气粒相物中的质量分数;利用三点选配法测定了21种酸香成分在乙醇中的嗅觉阈值,并结合其在卷烟烟气粒相物中的质量分数,计算了14个品牌卷烟烟气粒相物中各酸香成分的香气活性值,推测了21种酸香成分的贡献度。结果表明:①常规和低焦油烤烟型卷烟中释放量较大的酸香成分均为乙酸、丙酸和2-氧代丙酸,混合型卷烟释放量较大的酸香成分是乙酸、丙酸和3-甲基戊酸。②混合型卷烟主流烟气中21种酸香成分的释放总量及总质量分数明显高于烤烟型卷烟。③异戊酸和乙酸对烤烟型卷烟主流烟气酸香贡献最大,异戊酸、3-甲基戊酸和乙酸对混合型卷烟主流烟气酸香贡献最大。

Distribution characteristics in mainstream cigarette smoke and sensory contribution of acidic aroma components

In order to investigate the organic acids in mainstream cigarette smoke,especially acidic aroma characteristics as tobacco flavors,and their distribution characteristics and sensory contribution,the tobacco and tobacco smoke components listed in The Chemical Components of Tobacco and Tobacco Smoke were used as the data source,and the organic acids were systematically screened based on their aroma contribution probability and the safety as tobacco additives.From the screened organic acids,a total of 21 organic acids with acidic aroma characteristics and tobacco flavor potential were defined.The releases of the 21 acids in mainstream smoke of cigarettes of 14 brands and their contents in total particulate matters(TPMs)were determined using N,O-bis(trimethylsilyl)trifluoroacetamide derivatization and GC-MS method.The olfactory thresholds of the 21 acids in ethanol were determined by three-alternative forced-choice(3-AFC)method,and their odor activity values(OAVs)in TPMs of mainstream smoke of 14 brand cigarette samples were calculated on the basis of their contents.The results showed that:1)In the mainstream smoke of conventional and low-tar Virginia type cigarettes,the levels of acetic acid,propionic acid and 2-oxopropionic acid were higher.In blended type cigarettes,the levels of acetic acid,propionic acid and 3-methylvaleric acid were higher.2)The total contents of the 21 acids in mainstream smoke of blended type cigarettes were significantly higher than those of Virginia type cigarettes.3)The contributions of isovaleric acid and acetic acid to the acidic aroma of mainstream smoke of Virginia type cigarettes were the most significant,and those of isovaleric acid,3-methylvaleric acid and acetic acid to blended type cigarettes were the most significant.