共查询到18条相似文献,搜索用时 167 毫秒
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以玻璃珠为采样介质,采用顶空固相微萃取-气相色谱-质谱法分别对不同人体手部气味中主要挥发性成分醇、酚、醛、酮、酸、酯6类物质进行测定。同时采用Kolmorogv-Smirnoff秩检验和Spearman秩相关系数法从定性(共有峰的比率)和定量(共有峰的相对峰面积)的角度,综合地对不同人体气味的色谱图进行统计分析,结果显示,除了酸类和酚类物质不能用作区别不同人体气味的指标性成分外,其他4类物质均可作为鉴别不同人体气味的指标性成分。 相似文献
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人体腋窝气味的固相微萃取GC-MS分析 总被引:10,自引:2,他引:10
采用固相微萃取顶空进样技术和气相色谱-质谱法对人体的腋窝气味进行了分析,探讨了腋窝气味样品的采样方法和分析条件;利用70μm乙烯二醇-二乙烯基苯共聚物(CW-DVB)萃取头对43个人体腋窝气味样品进行了分析,一般获得98~105个色谱峰,检出了36个化合物;发现人体腋窝气味是由脂肪酸、酯、醇、胺、酮等物质组成,多次分析同一个体气味样品的色谱图有较好的相似性;从总的取样及分析结果看,利用固相微萃取顶空进样气相色谱-质谱技术在人体气味的分析研究中有着较好的应用前景。 相似文献
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采用固相微萃取/气相色谱-质谱联用(SPME/GC-MS)对沉香的成分进行研究,建立以特征成分鉴别沉香真伪的方法。通过SPME富集沉香的气味成分,GC-MS测定其化学组成,确定天然沉香的6种特征成分,并通过面积归一化确定特征成分在气味成分中的相对含量;通过沉香样品中气味成分的种类及其相对含量与天然沉香特征成分对比,判断沉香的真伪。SPME/GC-MS法具有样品用量小、操作简便快速、检测灵敏度高、特征性强、结果准确可靠的特点,适用于沉香气味成分的分析及真伪鉴别,且不破坏沉香收藏品的整体结构,已成功用于沉香药材及其工艺品等的真伪鉴别。 相似文献
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Li B Adams E Van Schepdael A Hoogmartens J 《Rapid communications in mass spectrometry : RCM》2006,20(3):393-402
Six unknown compounds present in bulk gentamicin samples have been identified by ion-pairing reversed-phase liquid chromatography coupled with ion trap mass spectrometry. The structures of these unknown compounds were deduced by comparison of their fragmentation patterns with those of the available related substances and gentamicin reference substances. Seven other unknown components were partially identified. 相似文献
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《Journal of separation science》2017,40(6):1234-1243
The fruits of Lycium ruthenicum Murr. have long been used in folk medicine. Nevertheless, detailed information related to its phenolic composition and its quality control remains scarce. In this study, a simple and reproducible method, based on high‐performance liquid chromatography combined with chemometrics, was developed to authenticate 18 samples of L. ruthenicum Murr. collected from different parts of China through fingerprint analysis. The main peaks were identified by quadrupole time‐of‐flight electrospray ionization mass spectrometry. Four phenolics were quantified, and the most abundant phenolic compound in almost all samples was kukoamine A. Hierarchical cluster analysis and principal component analysis were applied to classify these samples. Also, a total of 26 compounds, which were mainly phenolic compounds and anthocyanins, were identified or tentatively identified based on the available literature and standard references. Among these, 16 were reported for the first time in the extract. The results showed that there was no significant difference between L. ruthenicum fruits from different provinces in terms of chemical composition. Also, the fingerprint together with chemometric analyses and quadrupole time‐of‐flight electrospray ionization mass spectrometry are promising methods for evaluating the quality consistency, identification, and comprehensive evaluation of L. ruthenicum . 相似文献
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D J Harvey 《Journal of chromatography. A》1975,110(1):91-102
Ethyl acetate extracts of thirteen samples of nutmeg and one sample of mace were examined as trimethylsilyl and tri-n-propylsilyl derivatives by gas chromatography and mass spectrometry. Eleven compounds derived from two types of diphenylpropanoid were identified; the relative proportions and quantities of these compounds varied considerably in the different samples. Single ion chromatograms were used to obtain the relative concentration of one series of compounds. Preparation of the triethylsilyl and tri-n-propylsilyl derivatives resulted in greatly increased separation of the diphenylpropanoids over trimethylsilyl derivatives, which tended to produce a group of compounds with many unresolved peaks. 相似文献
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《液相色谱法及相关技术杂志》2012,35(8):1627-1642
Abstract High speed separation of fluorescent compounds was examined. The retention time of 21 compounds was measured in two reversed phase modes and an ion-exchange mode liquid chromatography. Furthermore, urine samples of new-born babies, cancer patients and normal subjects were analyzed by the above systems. Several peaks were positively identified from the retention time, however there were many unknown fluorescent compounds. Among them, two peaks were found on the chromatograms in the reversed phase modes. These compounds were very polar and could not be identified, however the ratio of these peak height was used for classification of urine samples. Furthermore, indole-3-acetic acid and 5-hydroxyindole-3-acetic acid in urine were selectively analyzed on an ion-exchange resin with isocratic eluent after filtration. 相似文献
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Application of activated carbon in the characterization of nitrogen compounds and phthalates in a landfill leachate 总被引:1,自引:0,他引:1
Lisiane dos Santos Freitas 《Microchemical Journal》2004,78(1):61-64
The goal of this work was the development of a methodology based on solid phase extraction (SPE) to characterize nitrogen compounds and phthalates from landfill leachate samples. Activated carbon (AC) was used to extract all the organic compounds from the samples. The samples were collected in Porto Alegre-South Brazil. As the AC used had small particle size, it was impossible to use it in the form of packed cartridges; hence, it had to be applied in a batch mode. The desorption of the organic compounds from the AC was made by sonication with dichloromethane. The extract was analyzed by gas chromatography with mass spectrometric detection (GC-MSD). Some aspects of the validation of the methodology were also established. Several nitrogen compounds and phthalates were identified in the samples, proving the efficiency of this method with regard to the selectiveness for these substances. 相似文献
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茶叶香味扫描和挥发性化学成分分析 总被引:11,自引:0,他引:11
为区分不同茶叶的香味,利用电子扫描仪对铁观音、兰贵人、玉针、碧螺春和云雾茶等5种茶叶进行了香味扫描,确定了电子鼻在茶叶香味辨别中的作用。采用固相微萃取.气相色谱/质谱联用法对这5种茶叶样品中的挥发性化学成分进行了定性和定量分析,分别鉴定出40、40、35、16和13种化合物。在鉴定出的化学成分中,乙酸、大茴香醚、十六烷、咖啡因、十六酸和双酚A是5种茶叶样品中所共有的化学成分,每种茶叶样品中又都含有一些特有的化学成分。最后对香味扫描结果和挥发性化学成分分析结果进行了分析,研究了挥发性化学成分组成和含量上的差别,对茶叶样品数据点在香味分析三维图中位置的影响。 相似文献
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After concentration of the organic substances from water samples of 700 to 20,000 l by adsorption on active carbon and desorption with chloroform in a large Soxhlet apparatus, tlie organic compounds were separated by extraction into 5 different groups: acids, phenols, bases, neutral and amphoteric substances. The phenol group was investigated by gas and paper chromatography, ultraviolet difference spectrophotometry and infrared spectroscopy. Phenol, 2,4,6-trichlorophcnol, 2- and 3-cresol, 2,4-xylenol and 2,4-dichlorophenol were identified in samples of raw and treated water. Quantitative measurements proved to be possible with gas chromatography. The conditions for quantitative desorption and separation were studied. 相似文献