卷烟真伪的鉴别

ttttt目的ttttt利用顶空—离子分子反应质谱(HS-IMR-MS)对真品卷烟和冒牌卷烟的挥发性成分进行分析，以期为卷烟真伪鉴别提供一种新方法，进一步提高卷烟真伪鉴别的准确性和客观性。ttttttttttttt方法ttttt以云烟(软珍品)和云烟(紫)两个牌号各20批次卷烟及各5种冒牌卷烟为试验材料，研究不同电离源、顶空平衡温度及平衡时间对分析效果的影响，通过选取群体特征离子，利用平均法构建两个牌号卷烟的特征质谱指纹图谱，并利用以相关系数法确定的合格阈值及主成分分析，对不同批次真品卷烟及冒牌卷烟进行评价。ttttttttttttt结果ttttt(1)以Xe做电离源，顶空平衡温度140 ℃，顶空平衡时间15 min时，卷烟分析效果最佳；(2)两个牌号不同批次卷烟与其特征质谱指纹图谱的相关系数均在0.99以上，而冒牌卷烟分别为0.914 7~0.934 3和0.884 7~0.908 8，且在主成分分析投影图上，同一牌号卷烟表现为相互聚集。ttttttttttttt结论tttttHS-IMR-MS法能有效区分真品卷烟和冒牌卷烟，可为卷烟真伪鉴别提供新的参考依据。tttt

A chemometric study on human breath mass spectra for biomarker identification in cystic fibrosis

tttttPurposetttttIn order to explore a new cigarette determination method and improve the accuracy and objectivity of discriminating counterfeit cigarette from genuine, headspace coupled with ion-molecule reaction mass spectrometry (HS-IMR-MS) was used to detect volatile constituent in genuine cigarettes and counterfeit samples.tttttttttttttMethodstttttTwenty batches of Yunyan (Soft Rarity) and Yunyan (Purple) respectively and corresponding 5 counterfeit cigarettes respectively were used as the test material. Effects of different types of ionization reagents, balanced temperatures and balanced times on the results were studied, and the representing mass spectrum fingerprints of the 2 brands were established by getting group characteristic ion peaks with average method. Besides, with the representing mass spectrum fingerprints as reference, different batches of genuine cigarettes and counterfeit samples have been evaluated with principal component analysis (PCA) and qualified thresholds by correlation coefficient.tttttttttttttResultsttttt(1) The optimal analysis conditions were selected as following: after balanced at 140 ℃ for 15 min with Xe being the ionization reagents. (2) The correlation coefficients were greater than 0.99 between different batches samples of the two brands respectively and their representing mass spectrum fingerprints. And for counterfeit samples, the correlation coefficients were at 0.914 7~0.934 3 and 0.884 7~0.908 8. In the PCA projection drawing, the cigarettes were gathered for their brands.tttttttttttttConclusiontttttHS-IMR-MS can be a new reference to discriminate counterfeit cigarettes from genuine for quickly and effectively.tttt