Analysis of cigarette lap adhesive by pyrolysis chromatography-mass spectrometry.Cigarette lab adhesive will burn with smoke.The burning products will be breathed in by smoker and possibly result in some health proble...Analysis of cigarette lap adhesive by pyrolysis chromatography-mass spectrometry.Cigarette lab adhesive will burn with smoke.The burning products will be breathed in by smoker and possibly result in some health problems.The burning process of two types of cigarette lab adhesives has been studied using a pyrolysis as a model of the combustion and the pyrolysis products has been analyzed by GC-MS.As a result,23 and 14 compounds were detected in J-1 and J-2 samples,respectively.The data will act as a base for establishing safety and quality standards of assistant materials in cigarette.展开更多
The jet fuel sample passed through a column packed with neutral alumina powder adsorbent,then the gum adsorbed on the adsorbent was washed out with acetic acid.The gum samples were detected by gas chromatography-mass ...The jet fuel sample passed through a column packed with neutral alumina powder adsorbent,then the gum adsorbed on the adsorbent was washed out with acetic acid.The gum samples were detected by gas chromatography-mass spectrometry with capillary column and pyrolysis chromatography-mass spectrometry.The predominant components in gum are alkyl phenols and aryl esters.展开更多
以D-果糖和L-天冬氨酸单钾盐为原料合成了2-L-天冬氨酸-2-脱氧-D-葡萄糖,利用傅里叶变换红外光谱、~1H核磁共振(nuclear magnetic resonance,NMR)、^(13)C NMR和高分辨率质谱技术进行结构表征。应用热重-微商热重和在线裂解气相色谱/质...以D-果糖和L-天冬氨酸单钾盐为原料合成了2-L-天冬氨酸-2-脱氧-D-葡萄糖,利用傅里叶变换红外光谱、~1H核磁共振(nuclear magnetic resonance,NMR)、^(13)C NMR和高分辨率质谱技术进行结构表征。应用热重-微商热重和在线裂解气相色谱/质谱联用技术分别研究了2-L-天冬氨酸-2-脱氧-D-葡萄糖的热失重和热裂解行为。采用1,1-二苯基-2-三硝基苯肼(1-diphenyl-2-picrylhydrazyl,DPPH)自由基清除法和还原能力法对其体外抗氧化活性进行测定。结果表明:合成产物为目标化合物;目标化合物的裂解温度为187.8℃,700℃时总失重达到91.26%;目标化合物裂解产物的数量随温度的升高而增多,裂解产物包括杂环类、酮类、羧酸类、醛类、酚类、烯烃类、醇类和芳烃类等化合物,裂解产物表现出烘焙香、甜香、焦甜香、可可香、花香和奶香等香韵;目标产物具有较强的DPPH自由基清除能力和还原能力,是一种潜在的抗氧化剂。展开更多
The products of thermal desorption were generated under the temperature of 280 ℃ and were analyzed by gas chromatography-mass spectrometry with capillary column,the residual monomer styrene was no detected.The produc...The products of thermal desorption were generated under the temperature of 280 ℃ and were analyzed by gas chromatography-mass spectrometry with capillary column,the residual monomer styrene was no detected.The products of pyrolysis were generated under the temperature of 550 ℃ and were analyzed by chromatography-mass spectrometry,14 compounds were detected.展开更多
文摘Analysis of cigarette lap adhesive by pyrolysis chromatography-mass spectrometry.Cigarette lab adhesive will burn with smoke.The burning products will be breathed in by smoker and possibly result in some health problems.The burning process of two types of cigarette lab adhesives has been studied using a pyrolysis as a model of the combustion and the pyrolysis products has been analyzed by GC-MS.As a result,23 and 14 compounds were detected in J-1 and J-2 samples,respectively.The data will act as a base for establishing safety and quality standards of assistant materials in cigarette.
文摘The jet fuel sample passed through a column packed with neutral alumina powder adsorbent,then the gum adsorbed on the adsorbent was washed out with acetic acid.The gum samples were detected by gas chromatography-mass spectrometry with capillary column and pyrolysis chromatography-mass spectrometry.The predominant components in gum are alkyl phenols and aryl esters.
文摘以D-果糖和L-天冬氨酸单钾盐为原料合成了2-L-天冬氨酸-2-脱氧-D-葡萄糖,利用傅里叶变换红外光谱、~1H核磁共振(nuclear magnetic resonance,NMR)、^(13)C NMR和高分辨率质谱技术进行结构表征。应用热重-微商热重和在线裂解气相色谱/质谱联用技术分别研究了2-L-天冬氨酸-2-脱氧-D-葡萄糖的热失重和热裂解行为。采用1,1-二苯基-2-三硝基苯肼(1-diphenyl-2-picrylhydrazyl,DPPH)自由基清除法和还原能力法对其体外抗氧化活性进行测定。结果表明:合成产物为目标化合物;目标化合物的裂解温度为187.8℃,700℃时总失重达到91.26%;目标化合物裂解产物的数量随温度的升高而增多,裂解产物包括杂环类、酮类、羧酸类、醛类、酚类、烯烃类、醇类和芳烃类等化合物,裂解产物表现出烘焙香、甜香、焦甜香、可可香、花香和奶香等香韵;目标产物具有较强的DPPH自由基清除能力和还原能力,是一种潜在的抗氧化剂。
文摘The products of thermal desorption were generated under the temperature of 280 ℃ and were analyzed by gas chromatography-mass spectrometry with capillary column,the residual monomer styrene was no detected.The products of pyrolysis were generated under the temperature of 550 ℃ and were analyzed by chromatography-mass spectrometry,14 compounds were detected.
