本文介绍一种可与色谱－质谱直接相连的燃烧挥发物分析装置及在线分析方法，并举例说明它在塑料废弃物，中草药燃烧产物分析中的应用。

循环制备液相色谱产品目录 其中包括我司循环制备液相色谱所有型号：LC-9101、LC-9102、LC-9103、LC-9104、LC-9201、LC-9204及所有相关配件、色谱柱等介绍。

本工作用高分辨裂解气相色谱－质谱（HR PyGC-MS）考察了两种聚苯撑苯并二杂环聚合物PBZT和PBZO的热分解产物组成、分布及其与高分子结构的关系，探讨了它们的热分解机理。

目的：研究瓜蒌薤白白酒汤药效作用的物质基础。 方法：在药理活性指导下利用各种化学和色谱手段对复方进行追踪分离，利用化学及波谱手段鉴定化学结构。 结果：从活性部位中分离得到4个黄酮类化合物。 结论：化合物1－3为首次从组成该复方单味中药中首次分离得到。化合物1具有较好的抑制血小板聚集活性。

用高分辨裂解气相色谱－质谱(HR PyGC-MS)研究了两种可溶性聚酰亚胺的热分解行为，研究了相应裂解产物的组成、分布及其与高分子结构的关系，并用热重法(TG)测定了它们的热分解反应动力学参数，提出了其热分解反应机理。

A family of polyunsaturated fatty acids is shown to be abundant in utero during pregnancy. Members of this family are able to induce cleavage of poly(ADP)ribose polymerase, and ultimately to induce apoptosis, in T-antigen-transformed Jurkat T cells. Free radical scavengers, including phenol and benzyl alcohol, block the apoptosis-inducing properties of these polyunsaturated fatty acids; this is consistent with a lipid peroxidation mechanism involving formation of hydroperoxy fatty acids.

A newly isolated rod-shaped, gram-negative anaerobic bacterium from human feces, named Julong 732, was found to be capable of metabolizing the isoflavone dihydrodaidzein to S-equol under anaerobic conditions. The metabolite, equol, was identified by using electron impact ionization mass spectrometry, 1H and 13C nuclear magnetic resonance spectroscopy, and UV spectral analyses. However, strain Julong 732 was not able to produce equol from daidzein, and tetrahydrodaidzein and dehydroequol, which are most likely intermediates in the anaerobic metabolism of dihydrodaidzein, were not detected in bacterial culture medium containing dihydrodaidzein. Chiral stationary-phase high-performance liquid chromatography eluted only one metabolite, S-equol, which was produced from a bacterial culture containing a racemic mixture of dihydrodaidzein. Strain Julong 732 did not show racemase activity to transform R-equol to S-equol and vice versa. Its full 16S rRNA gene sequence (1,429 bp) had 92.8% similarity to that of Eggerthella hongkongenis HKU10. This is the first report of a single bacterium capable of converting a racemic mixture of dihydrodaidzein to enantiomeric pure S-equol.

The ethyl acetate extract of roots of Tephrosia candida afforded three new spirorotenoids belonging to a new class of spirocompounds, named tephrospirolactone, tephrospiroketone I, and tephrospiroketone II. The structures of these compounds were determined mainly based on spectral analysis. The only known spirorotenoid described in the literature is amorphispironone, isolated from Amorpha fruticosa.

The isolation of a new fullerene dimer, C122H4, and its structural characterization by 13C NMR and 1H NMR spectroscopy and by UV/vis and IR spectroscopy are reported. The structure of this dimer consists of two fullerene cages, which are directly connected through two C-C bonds and two methylene bridges. Consequently, adjacent hexagonal faces of the two fullerene cages are arranged in a face to face manner. Molecular orbital calculations indicate that the proximity of the fullerene cages results in significant through space overlap in both the HOMO and LUMO. As a consequence of this overlap, the electrochemistry of the dimer shows electronic communication with stepwise reduction of each cage.

用高分辨裂解气相色谱－质谱(HR PyGC-MS)研究了以降冰片烯为端基聚酰亚胺(PMR-Ⅱ)的热固化过程和热分解行为。PMR-Ⅱ预聚体在330～390℃经不同时间(0～20h)固化后，根据其在315～590℃裂解产物的组成与分布，讨论了聚酰亚胺树脂的热固化和热分解反应机制。

High-resolution 13C NMR has been used to structurally characterize a single isomer possessing C2 molecular symmetry as well as an inseparable mixture of other isomers of [92]fullerene, produced from dysprosium arc-burned soot, separated and isolated via multi-stage recycling HPLC.

本文应用裂解气相色谱对交通肇事案件中的有关油漆样品进行定性分析，通过对肇事现场遗留的油漆样品和可以肇事车辆有关油漆的比对分析，得出各样品间的关系，为案件的定性提供了科学依据。

通过裂解气相色谱－质谱（PGC-MS）和热重分析（TGA）等方法，对轮胎不同部位的硫化胶进行了一系列彻底地分析。成功利用PGC-MS确定了多组份橡胶的并用比，另外PGC-MS方法也是一种简单而迅速地测定促进剂和防老剂的方法，这种方法不需对硫化胶进行预处理。用TGA的方法可测定硫化胶的含胶率、碳黑含量、抽出物含量以及灰分含量。在轮胎硫化胶分析中与传统的繁琐的化学分析相比，PGC-MS和TGA被证明是一种准确而迅速的分析方法。