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Classification of Chinese Traditional Drug-"Beimu" (Bulbus Fritillariae) by Pyrolysis High Resolution Gas Chromatography-Pattern Recognition 被引量:2
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作者 房杏春 李萍 +1 位作者 田琳 安登魁 《Journal of Chinese Pharmaceutical Sciences》 CAS 1992年第2期65-72,共8页
The combination of pyrolysis high resolution gas chromatography and pat- tern recognition techniques is a powerful tool for the classification of traditional Chinese drug.A study has been completed on 55 Beimu samples... The combination of pyrolysis high resolution gas chromatography and pat- tern recognition techniques is a powerful tool for the classification of traditional Chinese drug.A study has been completed on 55 Beimu samples of five different geographic origins: Eastern China.Central China.South-western China,North-western China and North-eastern China.Principal component analysis and SIMCA are applied to effectively classifying the samples according to the origin of the plants.The chemical information contained in the high resolution gas chromatographic data is sufficient to characterize the geographic origin of sam- pies. 展开更多
关键词 Beimu FRITILLARIA pyrolysis High Resolution gas chromatography Pattern Recognition
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Pyrolysis-Gas Chromatography/Mass Spectrometry for Microstructure and Pyrolysis Pathway of Polyester-Polyether Multiblock Copolymer
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作者 罗爱芹 叶玲 +2 位作者 傅若农 谢桂阳 王显伦 《Journal of Beijing Institute of Technology》 EI CAS 2001年第1期45-50,共6页
The composition and sequence distribution of monomeric units in polyester polyether multiblock copolymer were studied by pyrolysis? gas chromatography (PGC) and pyrolysis gas chromatography/mass spectrometry (PGC/M... The composition and sequence distribution of monomeric units in polyester polyether multiblock copolymer were studied by pyrolysis? gas chromatography (PGC) and pyrolysis gas chromatography/mass spectrometry (PGC/MS). PGC was applied to study the F t curve of the multiblock copolymer and PGC/MS was used to separate and identify the pyrolyzates. DTA experiment was used to study the decomposition temperature. The results show that the beginning point of elastomer’s decomposition was about 300?℃ and the decomposition temperature of most of the sample was 550?℃. Many pyrolyzates were produced because of the breaking of weak bonds in the sample. The possible microstructure was verified and the pyrolysis pathway of the copolymer was investigated. 展开更多
关键词 thermoplastic elastomer polyester polyether multiblock copolymer pyrolysis gas chromatography/mass spectrometry copolymer pyrolysis pathway MICROSTRUCTURE pyrolyzates
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Pyrolysis of Polytrimethylene Terephthalate(PTT) Fiber by Pyrolysis Gas Chromatography-Mass Spectroscopy
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作者 钱和生 《Journal of Donghua University(English Edition)》 EI CAS 2007年第5期604-609,共6页
Pyrolysis of polytrimethylene terephthalate(PTT) fiber has been investigated by pyrolysis gas chromatography-mass spectroscopy in the temperature range from 400℃ to 750℃ in order to observe the possible effect of th... Pyrolysis of polytrimethylene terephthalate(PTT) fiber has been investigated by pyrolysis gas chromatography-mass spectroscopy in the temperature range from 400℃ to 750℃ in order to observe the possible effect of the temperature on its composition of pyrolysates.At 400℃,pyrolysis of molecular chain could occur,only 13 pyrolysates could be identified.The trimethylene moieties bound to the macromolecular core by ester bonds are cleaved at around 400℃.At 550℃-750℃,pyrolysis of molecular chain could completely take place,46 pyrolysates could be found.As the temperature increases,the compositions of pyrolysate are distinctly increased.Several compounds,especially benzoic acid,monopropenyl-p-phthalate,2-propenyl benzoate,di-2-propenyl ester,1,4-benzenedicarboxylic acid,benzene,1,5-hexadiene,biphenyl and 1,3-propanediol dibenzoate could be formed.The thermal degradation mechanism,which is determined by structure and amount of the thermal decomposition products,are described.During pyrolysis of polytrimethylene terephthalate,polymeric chain scissions take place a peeling reaction as a successive removal of the dimer units from the polymeric chain.The chain scissions are followed by the elimination reaction,linkage action and secondary reactions,which bring about a variety fragment. 展开更多
关键词 polytrimethylene terephthalate fiber pyrolysis thermal degradation gas chromatography mass spectroscopy
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Fast Determination of the Rubber Content in Taraxacum kok-saghyz Fresh Biomass Using Portable Near-Infrared Spectroscopy and Pyrolysis-Gas Chromatography 被引量:2
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作者 Ying Chen Shun-Kai Gao +4 位作者 Yi-Yang Dong Xiang Ma Jia-Ru Li Min-Min Guo Ji-Chuan Zhang 《Journal of Analysis and Testing》 EI 2022年第4期393-400,共8页
Taraxacum kok-saghyz(TKS)is a plant native to the Tianshan valley on the border between China and Kazakhstan.TKS rubber is a good substitute for natural rubber.TKS's breeding work necessitates the need to screen h... Taraxacum kok-saghyz(TKS)is a plant native to the Tianshan valley on the border between China and Kazakhstan.TKS rubber is a good substitute for natural rubber.TKS's breeding work necessitates the need to screen high-yielding varieties,hence rapid determination of rubber content is essential for the screening.Conventional analytical methods cannot meet actual needs in terms of real-time testing and economic cost.Near-infrared spectroscopy analysis technology,which has developed rapidly in the field of industrial process analysis in recent years,is a green detection technology with obvious merits of fast measurement speed,low cost and no sample loss.This research aims to develop a portable non-destructive near-infrared spectroscopic detection scheme to evaluate the content of natural rubber in TKS fresh roots.Pyrolysis gas chromatography(Py-GC)was chosen as the reference method for the development of NIR prediction model.208 TKS fresh root samples were collected from the Inner Mongolia Autonomous Region of China.Near-infrared spectra were acquired for all samples.Randomly,two-thirds of them were selected as the calibration set,the remaining one-third as the validation set,and the partial least squares method was successfully established a good NIR prediction model for rubber content at 1080-1800 nm with a ratio of performance to deviation(RPD)of 5.54 and coefficient of determination(R^(2))of 0.95.This study showed that portable near-infrared spectroscopy could be used with ease for large-scale screening of TKS plants in farmland,and could greatly facilitate TKS germplasm preservation,high-yield cultivation,environment-friendly,high-efficiency and low-cost rubber extraction,and comprehensive advancement of the natural rubber industry thereof. 展开更多
关键词 Taraxacum kok-saghyz RUBBER Near-infrared spectroscopy pyrolysis gas chromatography
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同时裂解甲基化气相色谱法在油漆种类鉴别中的应用 被引量:6
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作者 张喜轩 丁军凯 +2 位作者 宋鸣 闫福宁 喻晓光 《色谱》 CAS CSCD 北大核心 2005年第4期436-436,共1页
关键词 同时裂解甲基化气相色谱法 裂解气相色谱法(pyrolysis gas chromatography) 油漆鉴别(paint identification) 四甲基氢氧化铵(tetramethylammonium hydroxide)
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热裂解气相色谱-质谱研究阻燃纤维的结构及烟雾毒性
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作者 杜振霞 《分析测试学报》 CAS CSCD 北大核心 2004年第z1期287-288,292,共3页
  随着高分子材料的不断开发,涌现出一大批用于阻燃和热辐射防护的耐高温纤维,如Basofil、Kermel、Visil、Nomex、P84、PBI和PBO等纤维,除了在衣着领域的应用外,在消防服、工业用阻燃防护服以及汽车等的内装饰物和家用防火材料等方面...   随着高分子材料的不断开发,涌现出一大批用于阻燃和热辐射防护的耐高温纤维,如Basofil、Kermel、Visil、Nomex、P84、PBI和PBO等纤维,除了在衣着领域的应用外,在消防服、工业用阻燃防护服以及汽车等的内装饰物和家用防火材料等方面,具有更优异的防护功能和穿着舒适性.…… 展开更多
关键词 Antiflaming fibre pyrolysis gas chromatography - mass spectrometry TOXICITY
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Analysis of Pyrolysates for Phenol Formaldehyde Resin by Py-GC/MS 被引量:1
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作者 钱和生 喻爱芳 《Journal of Donghua University(English Edition)》 EI CAS 2005年第4期20-24,共5页
Pyrolysis of phenol formaldehyde resin has been investigated by Pyrolysis Gas Chromatography-Mass Spectroscopy at the different temperatures from 500℃ to 750℃. Its composition of pyrclysates has been analyzed. Sever... Pyrolysis of phenol formaldehyde resin has been investigated by Pyrolysis Gas Chromatography-Mass Spectroscopy at the different temperatures from 500℃ to 750℃. Its composition of pyrclysates has been analyzed. Several compounds, especially benzene, toluene, p-xylene could only be formed above 500-550℃. Howerver, peak intensities for some pbend derivatives were decreased at the higher temperature. During pyrolysis, for thermo-setting phenol formaldehyde resins, polymeric chain scissions take place as a successive removal of the monomer units from the polymeric chain. The chain scissions are followed by secondary reactions, which leads to a variety of compounds. Addition reactions can also take place among the double-bond compounds during pyrolysis. 展开更多
关键词 phenol formaldehyde resin pyrolysis gas chromatography mass spectroscopy
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气相色谱法研究赋形剂对苯唑青霉素钠稳定性的影响
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作者 王祚凤 汤启昭 张浦海 《中国药科大学学报》 CAS CSCD 北大核心 1989年第1期10-12,共3页
采用程序裂解-气相色谱(GC)检测系统,配合红外光谱等手段,研究常用赋形剂如硬脂酸、硬脂酸镁、淀粉、滑石粉和碳酸钙等对苯唑青霉素钠和氨苄青霉素稳定性的影响。实验结果表明,硬脂酸和苯唑青霉素钠有固相反应发生,不宜作苯唑青霉素钠... 采用程序裂解-气相色谱(GC)检测系统,配合红外光谱等手段,研究常用赋形剂如硬脂酸、硬脂酸镁、淀粉、滑石粉和碳酸钙等对苯唑青霉素钠和氨苄青霉素稳定性的影响。实验结果表明,硬脂酸和苯唑青霉素钠有固相反应发生,不宜作苯唑青霉素钠固体制剂的赋形剂,其它赋形剂在相同条件下无此现象。这与差热分析的结果一致。 展开更多
关键词 气相色谱 赋形剂 苯唑青霉素钠
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Analysis of Pyrolysates for Polysulphoneamide Fiber by Py-GC/MS
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作者 钱和生 林丹丽 《Journal of Donghua University(English Edition)》 EI CAS 2006年第2期63-67,共5页
Pyrolysis of polysulphoneamide fiber has been investigated using pyrolysis gas chromatography-mass spectroscopy at the different temperatures from 420℃ to 750℃. Its compositions of pyrolysates have been analyzed. At... Pyrolysis of polysulphoneamide fiber has been investigated using pyrolysis gas chromatography-mass spectroscopy at the different temperatures from 420℃ to 750℃. Its compositions of pyrolysates have been analyzed. At 420℃,pyrolysis of molecular chain could not completdy take place, 12 compounds of pyrolysis have only been identified. When the temperature increases, the compositions of pyrolysate increase sharply. Several compounds, especially sulfur dioxide, benzene, aniline, benzoic acid, 1,4-benzene dicaronitrile, N-phenyl-acetamide, diphenylamine, benzc[g] isoquinoline, N-phenyl-benzamide, hi-( 4-cyanophenyl )benzamide, could be formed. The degradation mechanisms which are determined by structure and amount of the thermal decomposition products are described. During pyrolysis, for polysulphoneamide, polymeric chain scissions take place as a successive removal of the monomer units from the polymeric chain. The chain scissions are followed by secondary reactions, which lead to a variety of compounds. Additional reactions can also take place during pyrolysis. 展开更多
关键词 polysulphoneamide fiber pyrolysis gas chromatography mass spectroscopy.
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