简介：N-nitrosaminesarestrongcarcinogensforhumans.Thispapergivesanoverviewofthenitrosmainesincigarettesmokeincludingtheformation,theharmfulness,theanalyticalmethodsofthenitrosmainesandtheadsorptionsanddegradationsofN-nitrosamines.

简介：烟草种子油的丰满的酸作文表明油富于不饱和的丰满的酸，有罂酸的酸(71.63%)，油的酸(13.46%)和十六酸酸(8.72%)作为最丰富的不饱和、浸透的丰满的酸分别地。烟草油因此根据丰满的酸作文作为弄干半的类型被描绘。醇酸树脂树脂的合成被醇解执行或用碱的monoglyceride过程精制了烟草种子油，pentaerythritol，与锂氢氧化物一起的cis-1,2,3,6-tetrahydrophthalic酐是催化剂。那么准备的醇酸树脂树脂被发现是明亮并且有高注释的低颜色。弄干和坚硬性质和烟草种子油的粘附发源醇酸树脂树脂也一样的油长度的另外的醇酸树脂树脂被发现有点优异到那些。另外，水和说的醇酸树脂的酸抵抗也被发现可比较到另外的醇酸树脂。

简介：Thecomparisonofsolidphaseextraction(SPE)forthepreconcentrationandisolationofpolyphenolsintobaccosampleswascarriedoutbyultra-highperformanceliquidchromatography/tandemmassspectrometry(UPLC/MS/MS)andmultivariateanalysis.SeveraladsorbingmaterialsofSPE(C18,NH2,SAXandOASIS)wereinvestigated.ItwasfoundthattheC18andOASIScartridgescannotonlyspeedupthepurificationprocess,butalsosimplifytheSPEoperation.AUPLC/MS/MSwasusedforthedeterminationofpolyphenolsintobaccosamplesafterpurification.Allanalyteswereseparatedanddeterminedin2min.Thelimitofdetectionwas0.05ng/mL.Clusteranalysis(CA)andprincipalcomponentanalysis(PCA)wereusedfortheanalysisof4varieties(flue-curedtobacco,orientaltobacco,sun-curedtobaccoandburley)inordertointerprettheeffectofplantingandmachiningprocessontheconcentrationofpolyphenols.ThedifferenttypesoftobaccosamplescouldbeeasilyclusteredbyCA.PCAonthechemicalcompositionoftobaccoresultedintwoprincipalcomponents(PCs)thattake84.2%ofthetotalvariance.ThePCAandCAindicatethatthepolyphenolscanbeusedfordistinguishingtobaccotypes.