Element characteristics of nephrite minerals were determined by glow discharge mass spectrometry （GD-MS） through surface adherence method. To solve the conductivity problem of non-conductive nephrite samples, high p...Element characteristics of nephrite minerals were determined by glow discharge mass spectrometry （GD-MS） through surface adherence method. To solve the conductivity problem of non-conductive nephrite samples, high purity indium pin （〉99.9999%） was used as discharge host. During the preparation procedure, a small piece of nephrite sample was ground into powder （about 200 meshes）, and then the sample powder was coated on the surface of indium pin to form a rod sample. Typical elements of nephrite minerals were analyzed by GD-MS, and the relative standard deviations showed that the stability and reproducibility of this method were good. Meanwhile, four nephrite samples from two different deposits were further studied by this method. The GD-MS results of major elements and trace elements revealed that typical elements of the nephrite minerals from same deposit were similar, and those from different deposits exhibited significant difference. In addition, results of external-beam proton induced X-ray emission （PIXE） were consistent with the result of GD-MS determination. The present approach had been proven to be simple, efficient to perform the rapid screening and multi-element semi-quantitative analysis of nephrite samples.展开更多
采用顶空固相微萃取(headspace solid phase microextraction,HS-SPME)结合全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOFMS)技术对安徽明绿液酒的...采用顶空固相微萃取(headspace solid phase microextraction,HS-SPME)结合全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOFMS)技术对安徽明绿液酒的挥发性组分特征进行了分析。通过与自建白酒挥发性风味数据库比对、商业化数据库比对等多策略联用鉴定分析策略,在明绿液酒中鉴定出810种挥发性组分,包括386种潜在香气活性组分。通过对明绿液酒挥发性组分的解析,为白酒挥发性风味数据库补充了21种新的挥发性组分,10种新的潜在香气活性组分,包括2-甲氧基-3-异丁基吡嗪和2-甲氧基-3-异丙基吡嗪等明绿液酒特有的挥发性香气物质。为进一步探究这些独特香气物质的来源,对明绿液酒独特酿造原料绿豆的挥发性组分进行了分析,通过HS-SPME-GC×GC-TOFMS分析技术在蒸煮绿豆中鉴定出挥发性组分335种,其中潜在香气活性组分262种。发现甲氧基吡嗪、丁香酚等明绿液酒中的独特组分主要来源于绿豆原料,阐明绿液酒的独特风格与其独特原料的关联关系。该研究将有助于增进对酿造原料多样性之于白酒风格独特性的认识。展开更多
建立了全二维气相色谱-飞行时间质谱(GC×GC-TOF MS)分析卷烟主流烟气中中性化学成分的方法。以较长的弱极性柱HP-5MS(50 m×0.2 mm i.d.×0.33μm)作为第一维柱,较短的薄液膜中等极性柱DB-17MS(1.7 m×0.1 mm i.d....建立了全二维气相色谱-飞行时间质谱(GC×GC-TOF MS)分析卷烟主流烟气中中性化学成分的方法。以较长的弱极性柱HP-5MS(50 m×0.2 mm i.d.×0.33μm)作为第一维柱,较短的薄液膜中等极性柱DB-17MS(1.7 m×0.1 mm i.d.×0.1μm)作为第二维柱,对优质烟叶单料卷烟烟气的中性成分进行定性分析,经过人工纠错等分析初步鉴定出匹配度大于700的1 464种成分,重点讨论了中性香味羰基化合物全二维点阵的谱图特征,为烟气和复杂体系的深入研究提供了方法学基础。展开更多
基金Project supportect by the National Natural Science Foundation of~China （No. 51072208）, the Startup Funding of Chinese Academy of Sciences （No. O87YQ1110G）, the Plan of the Creative Funding of Shanghai Institute of Ceramics, Chinese Academy of Sciences （No. O97ZC1110G）, and the Plan of the Creative Funding of the Ministry of Science and Technology of the People＇s Republic of China （No. 2009IM031100）.
文摘Element characteristics of nephrite minerals were determined by glow discharge mass spectrometry （GD-MS） through surface adherence method. To solve the conductivity problem of non-conductive nephrite samples, high purity indium pin （〉99.9999%） was used as discharge host. During the preparation procedure, a small piece of nephrite sample was ground into powder （about 200 meshes）, and then the sample powder was coated on the surface of indium pin to form a rod sample. Typical elements of nephrite minerals were analyzed by GD-MS, and the relative standard deviations showed that the stability and reproducibility of this method were good. Meanwhile, four nephrite samples from two different deposits were further studied by this method. The GD-MS results of major elements and trace elements revealed that typical elements of the nephrite minerals from same deposit were similar, and those from different deposits exhibited significant difference. In addition, results of external-beam proton induced X-ray emission （PIXE） were consistent with the result of GD-MS determination. The present approach had been proven to be simple, efficient to perform the rapid screening and multi-element semi-quantitative analysis of nephrite samples.
文摘采用顶空固相微萃取(headspace solid phase microextraction,HS-SPME)结合全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOFMS)技术对安徽明绿液酒的挥发性组分特征进行了分析。通过与自建白酒挥发性风味数据库比对、商业化数据库比对等多策略联用鉴定分析策略,在明绿液酒中鉴定出810种挥发性组分,包括386种潜在香气活性组分。通过对明绿液酒挥发性组分的解析,为白酒挥发性风味数据库补充了21种新的挥发性组分,10种新的潜在香气活性组分,包括2-甲氧基-3-异丁基吡嗪和2-甲氧基-3-异丙基吡嗪等明绿液酒特有的挥发性香气物质。为进一步探究这些独特香气物质的来源,对明绿液酒独特酿造原料绿豆的挥发性组分进行了分析,通过HS-SPME-GC×GC-TOFMS分析技术在蒸煮绿豆中鉴定出挥发性组分335种,其中潜在香气活性组分262种。发现甲氧基吡嗪、丁香酚等明绿液酒中的独特组分主要来源于绿豆原料,阐明绿液酒的独特风格与其独特原料的关联关系。该研究将有助于增进对酿造原料多样性之于白酒风格独特性的认识。
文摘建立了全二维气相色谱-飞行时间质谱(GC×GC-TOF MS)分析卷烟主流烟气中中性化学成分的方法。以较长的弱极性柱HP-5MS(50 m×0.2 mm i.d.×0.33μm)作为第一维柱,较短的薄液膜中等极性柱DB-17MS(1.7 m×0.1 mm i.d.×0.1μm)作为第二维柱,对优质烟叶单料卷烟烟气的中性成分进行定性分析,经过人工纠错等分析初步鉴定出匹配度大于700的1 464种成分,重点讨论了中性香味羰基化合物全二维点阵的谱图特征,为烟气和复杂体系的深入研究提供了方法学基础。
