نتایج جستجو برای: gc ecd

تعداد نتایج: 38389  

Journal: :Environmental pollution 2009
Ting Xu Il Kyu Cho Dongli Wang Fernando M Rubio Weilin L Shelver Anne M E Gasc Ji Li Qing X Li

A gas chromatograph/electron capture detector-ion trap mass spectrometer (GC/ECD-ITMS) was used for the determination of polybrominated diphenyl ethers (PBDEs) in euryhaline fish and crabs. GC/ECD-ITMS results showed that average recoveries from the spiked fish samples are in a range of 58-123% with relative standard deviations (RSDs) of 5-19%. PBDE concentrations obtained from GC/ECD-ITMS rang...

Journal: :international journal of advanced biological and biomedical research 2014
bahareh shahnazari alireza jalali zand mohammad mahdi gheisari jahangir khajehali

in order to determine the level of residual dichlorvos pesticide on strawberry fruits in research greenhouse conditions in crop year of 2011-2012, a study was carried out in education and research center for greenhouse productions of islamic azad university of khorasgan of isfahan. factorial experiment was carried out based on a completely randomized design with two factors of pesticide consump...

Journal: :Protein expression and purification 2013
Lili Wu Yujia Zhai Jiuwei Lu Qinghua Wang Fei Sun

Glucagon is a pancreatic hormone that plays pivotal roles in regulating glucose homeostasis and metabolism. Glucagon exerts its action by binding to its receptor, glucagon receptor (GCGR), one of class B G-protein coupled receptors (GPCRs). Diabetes is a bihormonal disease in which excessive glucagon secretion is a major contributor in the pathogenesis of this disease; elucidation of how glucag...

Journal: :Korean Journal of Food Science and Technology 2013

Journal: :Rapid communications in mass spectrometry : RCM 2000
J L Martínez Vidal M Moreno Frías A Garrido Frenich F Olea-Serrano N Olea

Endosufan, alpha and beta, and three conversion products, sulphate, ether and lactone, were simultaneously determined in human serum by means of an analytical procedure which combines extraction with organic solvents, clean-up with H(2)SO(4) and by liquid column chromatography, and detection by gas chromatography (GC) using electron capture detection (ECD) and tandem mass spectrometry (MS/MS). ...

Journal: :PLOS ONE 2021

This study provides a review of methods used in the determination organochlorine pesticides (OCPs) ginseng and compares effectiveness three extraction (Quick, Easy, Cheap, Effective, Rugged, Safe (QuEChERS), modified QuEChERS Fast Pesticide Extraction (FaPEx)) analyses 20 OCPs root samples. For each method, sample mass, solvent volume sorbent mass were varied to identify optimum combination eff...

2014
Katarzyna Jaworek Marianna Czaplicka

The paper presents two methods for determination of phthalates in polymer materials. The methods compared were gas chromatography combined with the mass spectrometry (GC/MS) and gas chromatography with electron capture detector (GC/ECD). The GC/ECD technique was chosen for this comparison, because the ECD detector was one of few capable of detecting phthalates. In both cases the same procedure ...

2004
Dianne L. Poster Michele M. Schantz Stefan D. Leigh Stephen A. Wise

Six Standard Reference Materials (SRMs®) have been prepared by the National Institute of Standards and Technology (NIST) for the determination of PCBs as different Aroclor mixtures in methanol. Six additional SRMs of the same Aroclors in transformer oil have also been prepared. Specifically, solutions of Aroclors 1016, 1232, 1242, 1254, and 1260 have been gravimetrically prepared (individually)...

2017
Song-Hui Xu Jin-Zhou Huang Min Chen Ming Zeng Fei-Yan Zou De Chen Guang-Rong Yan

Amplification or over-expression of an activated Cdc42-associated kinase 1 (ACK1) gene is common in breast, lung and ovarian cancers. However, little is known about the role of ACK1 in gastric tumorigenesis. Here, we found that DNA copy numbers of the ACK1 gene and its mRNA expression levels were significantly increased in gastric cancer (GC) compared to normal gastric tissues. Additionally, si...

Journal: :Journal of chromatography. A 2012
Gen Zhang Yujing Mu Junfeng Liu Abdelwahid Mellouki

Gas chromatography equipped with electron capture detector (GC-ECD) has been widely used for detecting atmospheric peroxyacetyl nitrate (PAN) and peroxypropionyl nitrate (PPN). However, to the best of our knowledge, only a few capillary columns have been adopted for separation to achieve the direct and simultaneous analysis of the two atmospheric pollutants. This paper demonstrates a novel meth...

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