共查询到20条相似文献,搜索用时 11 毫秒
1.
F. Heimlich A. N. Davies R. Kuckuk M. Linscheid H. Mayer J. Nolte 《Fresenius' Journal of Analytical Chemistry》1995,352(7-8):743-747
The determination of Dinocap, one of the most often used acaricides and contact fungicides, is complicated by the fact that it consists of several isomeric alkyldinitro-phenyl-crotonates. In a first step, GC/IR and GC/MS has been used to separate the mixture, to determine the chromatographic behaviour and to fully characterize the six different isomeric compounds. The structures of additional impurities in the commerical preparation were shown to be the correlating phenols. An extraction/preconcentration method has been devised based on Carbopack B, yielding recoveries between 75 and 98%. A qualified estimation of the total Dinocap content of drinking water can be made by this approach for concentrations well below the limits set by the European drinking water regulations. The development of a complete analytical procedure based on these results appears to be feasible.Dedicated to Professor Dr. Dr. h.c. mult J. F. K. Huber on the occasion of his 70th birthday 相似文献
2.
乙酰乙酸乙酯烯醇式与酮式GC/MS和GC/IR分析 总被引:1,自引:0,他引:1
采用GC/MS对乙酸乙酯烯醇式在不同离子源温度,接口温度,进样器温度,柱温等条件下的气相色谱行为进行了研究,用重氢交换法和高分辨质谱法对烯醇式和酮式的质谱进行了解析,并通过GC/IR研究了烯醇式和酮式的红外光谱。 相似文献
3.
Georg Raber Sakda Khoomrung Mojtaba S. Taleshi John S. Edmonds Kevin A. Francesconi 《Talanta》2009,78(3):1215-97
Arsenic-containing hydrocarbons have recently been reported as natural constituents of fish oil. We report a simple method for determining these compounds by GC/MS. Application of the methodology will delineate the distribution of these novel arsenic compounds in foods, and facilitate an assessment of the toxicological implications. 相似文献
4.
Retention indices of cymene isomers published in popular GC—MS atlases were found to be erroneous by analyzing synthetic samples.
The following retention indices (RI) were found using a nonpolar phase (diphenyl: dimethylpolysiloxane, 5:95) for four essential-oil
components with indistinguishable mass spectra: 3,7,7-trimethylcyclohepta-1,3,5-triene (RI = 970), m-cymene (RI = 1022), p-cymene (RI = 1024), and o-cymene (RI = 1039). The relative distributions of these compounds were evaluated based on the analysis of about 1000 essential
oils. Simple methods were given for preparing standard mixtures of isomeric compounds for identification by GC—MS.
__________
Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 569–571, November–December, 2006. 相似文献
5.
6.
7.
调味品中氯丙醇的GC/ECD和GC/MS/MS衍生化检测方法研究及应用 总被引:8,自引:0,他引:8
报道了调味品中氯丙醇的衍生化气相色谱(GC/ECD)和衍生化气相色谱双串联质谱法(GC/MS/MS)测定。GC/ECD测定酱油中3—氯—1,2—丙二醇(3—MCPD)的检出限达到0.01mg/kg,回收率为91%~104%,变异系数为2.27%~7.96%;GC/MS/MS同时测定酱油中1,3—二氯—2—丙醇、2,3—二氯—1—丙醇和3—氯—1,2—丙二醇,1,3—二氯—2—丙醇、2,3—二氯—1—丙醇的检出限为0.02mg/kg,3—氯—1,2—丙二醇的检出限为0.01mg/kg,回收率在92%~106%,变异系数为3.51%~13.33%。 相似文献
8.
IR与ESI/MS结合鉴定复杂表面活性剂结构 总被引:1,自引:0,他引:1
复杂表面活性剂的结构鉴定往往是比较困难的,尤其在有许多副产物共存时,尝试应用红外光谱、质谱以及电喷雾质谱相结合的方法鉴定复杂表面活性剂及其副产物的结构。 相似文献
9.
Tamoxifen is an antiestrogenic drug which is used in the treatment of breast cancer and nonmalignant breast disorders. It also has a stimulating effect on the secretion of hypofisar gonadotropic hormones and is generally used in the treatment of infertility. In males, tamoxifen causes an increase of endogenous production of androgenic steroids, and therefore is used by athletes. A method for identification of tamoxifen and metabolites in urine, using the gas chromatography and mass spectrometry system (GC/MS) is described. This study also reports the extraction methodology of tamoxifen and metabolites in urine samples of healthy male volunteers and the GC/MS conditions used to identify tamoxifen and its metabolites. 相似文献
10.
Gambelunghe C Sommavilla M Ferranti C Rossi R Aroni K Manes N Bacci M 《Biomedical chromatography : BMC》2007,21(4):369-375
A simple and sensitive gas chromatography/tandem mass spectrometry (GC/MS/MS) method is described for the detection of anabolic steroids, usually found in keratin matrix at very low concentrations. Hair samples from seven athletes who spontaneously reported their abuse of anabolic steroids, and in a single case cocaine, were analyzed for methyltestosterone, nandrolone, boldenone, fluoxymesterolone, cocaine and its metabolite benzoylecgonine. Anabolic steroids were determinate by digestion of hair samples in 1 m NaOH for 15 min at 95 degrees C. After cooling, samples were purificated by solid-phase and liquid-liquid extraction, then anabolic steroids were converted to their trimethylsilyl derivative and finally analyzed by GC/MS/MS. For detection of cocaine and benzoylecgonine, hair samples were extracted with methanol in an ultrasonic bath for 2 h at 56 degrees C then overnight in a thermostatic bath at the same temperature. After the incubation, methanol was evaporated to dryness, and benzoylecgonine was converted to its trimethylsilyl derivative prior of GC/MS/MS analysis. Results obtained are in agreement with the athletes' reports, confirming that hair is a valid biological matrix to establish long-term intake of drugs. 相似文献
11.
12.
多廿醇是从制糖滤泥中分离得到的一种高级脂肪伯醇天然混合物,其化学组成分析未见报道。本文采用气相色谱法(GC)和气相色谱/质谱法(GC/MS),对其组分和结构进行了分析和鉴定。 相似文献
13.
The chemical characterisation of waterlogged archaeological wood is of paramount importance in terms of understanding not only the degradation processes of wood in artistic and archaeological objects but also the development of consolidation and conservation procedures. The two different types of archaeological waterlogged wood were characterized using several analytical techniques. The analytical protocol consists in using PY/GC/MS with in situ derivatisation with hexamethyldisilazane, GC/MS of the extractives, 1H, 13C and 31P NMR analysis, and GPC. The main results showed that one of the ancient samples was a gymnosperm wood from the Pinaceae family, whereas the other type of wood was an angiosperm. Lignin from the angiosperm was oxidised in a benzylic position of β-O-4 to give oxo functional groups, in primary alcohol moiety to give carboxylic groups. In addition, the formation of a new intermonomeric bond 5-O-4 was observed. 相似文献
14.
介绍从南沙海域采集的RhaphisiapallidaRidley海绵样品中分离得到的混合甾类样品,采用气相色谱质谱法鉴定其组分。应用质谱裂解规律结合计算机检索确定了十一种甾体化合物的结构,其中两个是首次在海绵生物中发现的甾体激素化合物。 相似文献
15.
Zhong Zhou CHENG Ze Hui JIA Yan CHEN Li Ying CHEN Hua LI 《中国化学快报》2006,17(8):1057-1060
Nicorandil [N-(2-hydroxyethyl)-nicotinamide nitrate NIC] is a novel kind of compound in the treatment of angina pectoris. NIC can be degraded easily in storage. The degradation products include N-(2-hydroxyethy) nicotinamide (HN), nitrate ion (NI), and ni… 相似文献
16.
17.
18.
19.
20.
烟草制品中紫苏葶的气相色谱/质谱法分析 总被引:1,自引:0,他引:1
以二氯甲烷为溶剂,丙酸苯乙酯为内标,将烟草制品进行萃取,经固相萃取柱纯化,采用气相色谱/质谱法定量分析了烟草制品中的紫苏葶.方法的定性检测限为0.11μ/g,定量检测限为0.36μ/g,平均回收率为95.53%,相对标准偏差(RSD)为1.89%. 相似文献