Chromatography-mass spectrometry(GC-MS)was used to analyze the volatile components of cut tobacco samples with the help of heuristic evolving latent projections(HELP).After extracting with simultaneous distillation an...Chromatography-mass spectrometry(GC-MS)was used to analyze the volatile components of cut tobacco samples with the help of heuristic evolving latent projections(HELP).After extracting with simultaneous distillation and extraction method,the volatile components in cut tobacco were detected by GC-MS.Then the obtained original two-dimensional data were resolved into pure mass spectra and chromatograms.The qualitative analysis was performed by similarity searches in the national institute of standards and technology(NIST)mass database with the obtained pure mass spectrum of each component and the quantitative results were obtained by calculating the volume of total two-way response.The accuracy of qualitative and quantitative results were greatly improved by using the two-dimensional comprehensive information of chromatograms and mass spectra.107 of 141 separated constituents in the total ion chromatogram of the volatile components were identified and quantified,accounting for about 88.01% of the total content.The result proves that the developed method is powerful for the analysis of complex cut tobacco samples.展开更多
The cut tobacco transporting is the absolutely necessarily important tache, Whether the transportation process stability is a direct impact on production quality and manufacturing standards. The wind system is adopted...The cut tobacco transporting is the absolutely necessarily important tache, Whether the transportation process stability is a direct impact on production quality and manufacturing standards. The wind system is adopted by most tobacco companies because of it caused least disruptive of the cut tobacco structure and the pipe network layout of system is flexible, but the wind system is greater influence by itself, different control methods are caused greater difference of process indicators, for example essence and spice ingredients, moisture proportion and smoke flavor. Based on the above reasons, so we need to design the control method of wind system necessarily, in addition we must checkout the control accuracy opportunely, so that it is satisfied by the actual working conditions.展开更多
为明确带茎采收对烤后上部烟叶质量的影响,以‘云烟87’为试材,通过主成分分析(PCA)、偏最小二乘法判别分析(PLS-DA)和变量权重重要性排序(variable importance in projection,VIP)等多维数据分析方法,研究湖北省6个乡镇带茎采烤与逐叶...为明确带茎采收对烤后上部烟叶质量的影响,以‘云烟87’为试材,通过主成分分析(PCA)、偏最小二乘法判别分析(PLS-DA)和变量权重重要性排序(variable importance in projection,VIP)等多维数据分析方法,研究湖北省6个乡镇带茎采烤与逐叶采烤烤后烟外观质量、物理特性、化学成分、感官质量等的差异。结果表明,剔除偏离指标后PLS-DA模型R_(X)^(2)=0.578、R_(Y)^(2)=0.997、Q^(2)_(PLS-DA)=0.96,模型有效;对模型进行200次响应排序,R^(2)_(intercept)、Q^(2)_(intercept)截距分别为0.903、-0.0125,模型拟合较好;最终共筛选出VIP>1.0指标差异较大的变量,包括还原糖、总糖、感官质量和多种氨基酸含量等共27项,其中总糖、还原糖、感官权重总分、香气质、杂气、刺激性6项为正向作用,其余21种为负向作用。综上所述,带茎采烤有利于提高上部烟叶的总糖、还原糖和部分感官因素的含量,不利于总氮、氨基酸类物质含量的提高。展开更多
基金Project supported by the Postdoctoral Foundation of Changde Cigarette FactoryProject(20060400887) supported by China Postdoctoral Science Foundation
文摘Chromatography-mass spectrometry(GC-MS)was used to analyze the volatile components of cut tobacco samples with the help of heuristic evolving latent projections(HELP).After extracting with simultaneous distillation and extraction method,the volatile components in cut tobacco were detected by GC-MS.Then the obtained original two-dimensional data were resolved into pure mass spectra and chromatograms.The qualitative analysis was performed by similarity searches in the national institute of standards and technology(NIST)mass database with the obtained pure mass spectrum of each component and the quantitative results were obtained by calculating the volume of total two-way response.The accuracy of qualitative and quantitative results were greatly improved by using the two-dimensional comprehensive information of chromatograms and mass spectra.107 of 141 separated constituents in the total ion chromatogram of the volatile components were identified and quantified,accounting for about 88.01% of the total content.The result proves that the developed method is powerful for the analysis of complex cut tobacco samples.
文摘The cut tobacco transporting is the absolutely necessarily important tache, Whether the transportation process stability is a direct impact on production quality and manufacturing standards. The wind system is adopted by most tobacco companies because of it caused least disruptive of the cut tobacco structure and the pipe network layout of system is flexible, but the wind system is greater influence by itself, different control methods are caused greater difference of process indicators, for example essence and spice ingredients, moisture proportion and smoke flavor. Based on the above reasons, so we need to design the control method of wind system necessarily, in addition we must checkout the control accuracy opportunely, so that it is satisfied by the actual working conditions.
文摘为明确带茎采收对烤后上部烟叶质量的影响,以‘云烟87’为试材,通过主成分分析(PCA)、偏最小二乘法判别分析(PLS-DA)和变量权重重要性排序(variable importance in projection,VIP)等多维数据分析方法,研究湖北省6个乡镇带茎采烤与逐叶采烤烤后烟外观质量、物理特性、化学成分、感官质量等的差异。结果表明,剔除偏离指标后PLS-DA模型R_(X)^(2)=0.578、R_(Y)^(2)=0.997、Q^(2)_(PLS-DA)=0.96,模型有效;对模型进行200次响应排序,R^(2)_(intercept)、Q^(2)_(intercept)截距分别为0.903、-0.0125,模型拟合较好;最终共筛选出VIP>1.0指标差异较大的变量,包括还原糖、总糖、感官质量和多种氨基酸含量等共27项,其中总糖、还原糖、感官权重总分、香气质、杂气、刺激性6项为正向作用,其余21种为负向作用。综上所述,带茎采烤有利于提高上部烟叶的总糖、还原糖和部分感官因素的含量,不利于总氮、氨基酸类物质含量的提高。
