运用HPLC法测定新鲜烟叶中10种多酚的含量,色谱柱为CAPCELL PAK CR(4.6 mm I.D.×250 mm,5μm),柱温为30℃,二极管阵列检测器,检测波长340 nm.流动相流速0.8 m L/min,梯度洗脱.10种多酚在1~50μg/m L范围内具有良好的线性(r>0.99...运用HPLC法测定新鲜烟叶中10种多酚的含量,色谱柱为CAPCELL PAK CR(4.6 mm I.D.×250 mm,5μm),柱温为30℃,二极管阵列检测器,检测波长340 nm.流动相流速0.8 m L/min,梯度洗脱.10种多酚在1~50μg/m L范围内具有良好的线性(r>0.999),加标回收率在90.0%~101.4%之间,RSD<5%.测定结果显示,新鲜烟叶中多酚含量分别为:绿原酸7106μg/g,云香苷5441μg/g,隐绿原酸5237μg/g,山奈酚苷1159μg/g,新绿原酸975μg/g,咖啡酸723μg/g,香豆素256μg/g,莨菪苷89μg/g,莨菪亭38μg/g,阿魏酸28μg/g.展开更多
多酚类物质含量高低是衡量烟叶质量的重要指标,快速准确测定其含量可为烟叶质量评价和多酚代谢研究提供技术支持。本研究将25 mg新鲜烟叶冻干粉末样品经5 mL 50%甲醇超声20 min提取后离心,上清液经0.22μm滤膜过滤后用超高效液相色谱-...多酚类物质含量高低是衡量烟叶质量的重要指标,快速准确测定其含量可为烟叶质量评价和多酚代谢研究提供技术支持。本研究将25 mg新鲜烟叶冻干粉末样品经5 mL 50%甲醇超声20 min提取后离心,上清液经0.22μm滤膜过滤后用超高效液相色谱-串联质谱仪(UPLC-MS-MS)在多反应监测(MRM)模式下分析。研究发现,咖啡酸、阿魏酸、莨菪亭和香豆素等4种低含量多酚化合物在0.05~5.00μg/mL范围内线性良好;新绿原酸、莨菪苷、山奈酚、山奈酚苷和山奈酚-3-O-芸香糖苷等5种中等含量多酚化合物在0.2~40.0μg/m L范围内线性良好;绿原酸、隐绿原酸和芸香苷等3种高含量多酚化合物在5~200μg/mL范围内线性良好。12种多酚的回收率在84.7%~102%,相对标准偏差(n=6)在1.9%~5.7%,定量限在0.5~8.0μg/g。研究结果表明,本方法具有灵敏度高、专一性好和结果准确等特点,适用于新鲜烟叶中12种多酚含量的高通量分析,可为新鲜烟叶代谢过程中多酚含量的变化研究提供有效分析手段。展开更多
Simple procedures for extraction and chromatographic determination of dimethachlon residues in fresh tobacco leaves and cut-tobacco are described.The determination was carried out by capillary gas chromatography(GC) w...Simple procedures for extraction and chromatographic determination of dimethachlon residues in fresh tobacco leaves and cut-tobacco are described.The determination was carried out by capillary gas chromatography(GC) with electron capture detection(ECD) and confirmed by GC-MS.The mean recoveries and relative standard deviation(RSD) were 93.2%~112.9% and 3.5%~6.7%,respectively at levels ranging from 0.01 to 0.1 mg/kg.The limit of determination was 0.001 mg/kg.Tobacco samples in routine check were successfully analyzed using the proposed method.展开更多
文摘运用HPLC法测定新鲜烟叶中10种多酚的含量,色谱柱为CAPCELL PAK CR(4.6 mm I.D.×250 mm,5μm),柱温为30℃,二极管阵列检测器,检测波长340 nm.流动相流速0.8 m L/min,梯度洗脱.10种多酚在1~50μg/m L范围内具有良好的线性(r>0.999),加标回收率在90.0%~101.4%之间,RSD<5%.测定结果显示,新鲜烟叶中多酚含量分别为:绿原酸7106μg/g,云香苷5441μg/g,隐绿原酸5237μg/g,山奈酚苷1159μg/g,新绿原酸975μg/g,咖啡酸723μg/g,香豆素256μg/g,莨菪苷89μg/g,莨菪亭38μg/g,阿魏酸28μg/g.
基金Project (No. 2006NG01) supported by the Agriculture Breakthrough Program of Yunnan Province, China
文摘Simple procedures for extraction and chromatographic determination of dimethachlon residues in fresh tobacco leaves and cut-tobacco are described.The determination was carried out by capillary gas chromatography(GC) with electron capture detection(ECD) and confirmed by GC-MS.The mean recoveries and relative standard deviation(RSD) were 93.2%~112.9% and 3.5%~6.7%,respectively at levels ranging from 0.01 to 0.1 mg/kg.The limit of determination was 0.001 mg/kg.Tobacco samples in routine check were successfully analyzed using the proposed method.