chromatography mass spectrometry and capillary electrophoresis mass spectrometry

DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf

... threshold 441 Present and < Mass 443 High -mass resolution 442 Base peak or >50% of Mass 198 High -mass resolution and sensitivity 443 15-24% of Mass 442 High -mass resolution and isotope ratio All ... peak Low -mass sensitivity 68

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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 6

Danh mục: Cao đẳng - Đại học

... water, drinking water, rain water, river water and seawater under various pH and irradiation sources (sunlight, darkness, indoor incandescent lighting and artificial UV lighting) Hydrolysis was found ... time-aged soil, MAE exhibited better recoveries than SFE Liquid chromatography- atmospheric pressure ionization- ion trap mass spectrometry was used to investigate the chemical degradation behavior ... half-lives and degradation rates were obtained in various matrix and irradiation sources Based on kinetic studies, propoxur was found to degrade more rapidly at higher light exposure and pH Furthermore,...

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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 5

Danh mục: Cao đẳng - Đại học

... interchannel delay of 0.02 s and a mass span of mass unit Quantitation was based on the area under the peak from the mass chromatogram of the above molecular ions at m/z 60, 151, and 210 For the LC separation ... 80 °C extraction temperature, and 6-min microwave heating The differences between the distribution of propoxur and its transformation products in biota and soils, and additionally the difference ... the main variables (A, B, C and D), two-variable interaction, and the level setting values of the main variables applied to aquatic animals (goldfish and tortoises) and sea lettuce are displayed...

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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 4

Danh mục: Cao đẳng - Đại học

... pressure and heating duration 74 4.1.2 Experimental 4.1.2.1 Reagents and soil preparation Analytical-grade PAHs (naphthalene and phenanthrene), PCB (PCB-1242 and PCB1248), triazine (atrazine 98% and ... AB AC and BC which, as indicated by their names, are interactions between A and B, between A and C, and between B and C, respectively Only two-factor interactions are considered since experience ... (min) Fig 4-7 (a) Chromatography of standard mixture of four carbamates (b) Chromatography obtained after optimum MAE (6 heating at 80 ºC, extraction solvent: methanol; (c) Chromatography obtained...

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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 3

Danh mục: Cao đẳng - Đại học

... 0.994, 0.996 and 0.995 for methanol-water-based standards, ultrapure-water-based standards and methanol-based standards, respectively In addition, the use of solvent-based or matrix-based standards ... water, river water and seawater under various pH and irradiation sources (sunlight, darkness, indoor lighting (incandescent) and artificial UV lighting) For the first time, liquid chromatography- atmospheric ... under different pH and irradiation sources (sunlight, darkness, indoor incandescent lighting and artificial UV light) by using LC-APCI-ITMS with selected ion monitoring mode; and (3) To investigate...

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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 2

Danh mục: Cao đẳng - Đại học

... compound and stored at - 4°C Working solutions were prepared by diluting the stock solutions with acetone Polychlorinated biphenyls (PCB-1242 and PCB-1248) were purchased as individual standard ... Ultra-Scientific Atrazine (purity 98%) and simazine (purity 99%) were purchased from Supelco Stock solutions (1000 µg/ml) were prepared by dissolving the solid standards in acetone and stored under refrigeration ... obtained In order to meet the fortification standards for recovery and analytical precision, a portion of each fish sample was added an appropriate volume of standard solution, thereby obtaining the...

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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 1

Danh mục: Cao đẳng - Đại học

... often contain unknowns and/ or analytes in low concentration, the combination of chromatography (for separation) with mass spectrometry (as detector that provides sensitive and structural information) ... obvious choice However, liquid chromatography coupled to mass spectrometry is an odd combination In HPLC, the sample is in solution and at atmospheric pressure, while the mass analysis of ions takes ... identification and quantitation Among these, sample preparation is the most tedious and time-consuming step, and usually the source of imprecision and inaccuracy of the overall analysis Currently, chromatography...

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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry

Danh mục: Môi trường

... and Environment Technology, Vol 8, No.4, 2010 chromatography (Nowack et al., 1996; Kemmei et al., 2009), ion chromatography/ mass spectrometry (Bauer et al., 1999; Knepper et al., 2005), gas chromatography/ mass ... 1999; Knepper et al., 2005), gas chromatography/ mass spetrometry (Nishikawa and Okumura, 1995), and liquid chromatography/ tandem spetrometry (Quintana and Reemtsma, 2007) To simplify Japan’s recommended ... region and Hyogo Prefecture) and April (Kyoto Prefecture and Kanto region) 2010 River water samples were collected in 300 mL glass bottles and stored in the dark at 4ºC until analysis Standard and...

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liquid chromatography - mass spectrometry an introduction

Danh mục: Sinh học

... Val mass spectrometry in combination with mass spectrometry (tandem mass spectrometry) multiple stages of tandem mass spectrometry National Institute of Health (USA) National Institute of Standards ... To understand the need to interface liquid chromatography and mass spectrometry • To understand the requirements of an interface between liquid chromatography and mass spectrometry and the performance ... Quadrupole Mass Analyser 3.3.2 The (Quadrupole) Ion-Trap Mass Analyser 3.3.3 The Double-Focusing and Tri-Sector Mass Analysers 3.3.4 The Time-of-Flight Mass Analyser 3.4 Tandem Mass Spectrometry...

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niessen - liquid chromatography - mass spectrometry 3e [lcms] (crc, 2006)

Danh mục: Hóa học - Dầu khí

... 9) and electrospray and related methods (Ch 10) Developments in combining supercritical © 2006 by Taylor and Francis Group, LLC fluid chromatography and capillary electrophoresis to mass spectrometry ... coupling of liquid chromatography and mass spectrometry (LC–MS) These research efforts were mainly inspired by the great success of combined capillary gas chromatography mass spectrometry (GC–MS) ... Roy Eksteen, Peter Schoenmakers, and Neil Miller 79 Liquid Chromatography Mass Spectrometry: Second Edition, Revised and Expanded, Wilfried Niessen 80 Capillary Electrophoresis of Proteins, Tim...

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Analysis of keto enol tautomers of curcumin by liquid chromatography mass spectrometry

Danh mục: Sinh học

... Analysis of curcuminoids by positive and negative electrospray ionization and tandem mass spectrometry, Rapid Commun Mass Spectrom 20 (2006) 1001–1012 [18] F Payton, P Sandusky, W.L Alworth, NMR study ... of peaks and in positive and negative detections (a) Peak 1, positive, (b) peak 1, negative, (c) peak 2, positive, and (d) peak 2, negative [(Fig._3)TD$IG] Fig Mass spectra of peaks and with ... derivatives and their Ab-binding activities in the context of the therapies for Alzheimer’s disease, Biomaterials 31 (2010) 4179–4185 [14] T.J Novak, R Helmy, I Santos, Liquid chromatography mass spectrometry...

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Báo cáo khoa học: "Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry" pps

Danh mục: Báo cáo khoa học

... The m / z 576.5 and 679.5 in mass spectra of erythromycin and roxithromycin were corresponding with Simultaneous Determination of Various Macrolides by Liquid Chromatography/ Mass Spectrometry 105 ... roxithromycin (B), tylosin (C) and tiamulin (D) Simultaneous Determination of Various Macrolides by Liquid Chromatography/ Mass Spectrometry 107 Table Summarized mass spectra of the drugs used ... drugs produced two adduct ions, [M+Na]+ and [M+K]+ at , m/ z 756.5 and 772.5 for erythromycin, at m/ z 859.5 and 875.5 for roxithromycin, at m/ z 938.5 and 954.5 for tyloisin (Fig 3) The appearance...

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Báo cáo khoa học: "Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers" pdf

Danh mục: Báo cáo khoa học

... 1998, 720 (1-2), 89-97 Zhong, D., Chen, X., Gu, J., Li, X and Guo, J Applications of liquid chromatography- tandem mass spectrometry in drug and biomedical analyses Clin Chim Acta 2001, 313(1-2), ... residues in bovine tissues by micro-liquid chromatography- tandem mass spectrometry J Chromatogr A 2001, 926(1), 97-104 Demotes-Mainaird, F., Vincon, G., Jarry, C and Albin, H Micro-method for the determination ... Lim, J H., P ark, B K and Yun, H I Simultaneous determination of various macrolides by liquid chromatography/ mass spectrometry J Vet Sci 2002, 3(2),103-108 Kirst, H A and Sides, G D New directions...

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Gas Chromatography Mass Spectrometry doc

Danh mục: Cơ khí - Chế tạo máy

... parapin, mỡ apiazol, polyetylen Các loại Silicon : polysiloxan – sản phẩm trùng ngưng monome silandiol R2Si(OH)2 Các loại ete, ester : phlatat, sebacat, photphat, suxinat, adipat dạng monome polime ... tìm kết tương ứng) Hoặc sở để đăng ký chất (nếu phép so sánh không tìm kết tương ứng) Hình 2: Mass- spectrum    Trong hình 2, hình ảnh khối cao dodecane Phần nềm GC/MS giống thư viện hình...

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Determination of endocrine disrupting compounds in environmental samples using microextraction combined with gas chromatography mass spectrometry

Danh mục: Cao đẳng - Đại học

... with gas chromatography mass spectrometry, J CHROMATOGR A (2003), 1016 (1): 11-20 [3] C Basheer, H K Lee, J P Obbard Application of liquid-phase microextraction and gas chromatography mass spectrometry ... Capillary electrophoresis DI-SPME Direct immersion-SPME d wt Dry weight ECD Electron capture detector EDCs Endocrine disrupting compounds GC Gas chromatography GC/MS Gas chromatography mass spectrometry ... of this work was to develop a simple and efficient method based on SPME for extraction and derivatization APs and BPA from seawater for gas chromatography- mass spectrometric analysis The performance...

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LIQUID CHROMATOGRAPHY–MASS SPECTROMETRY:AN INTRODUCTION

Danh mục: Y - Dược

... Val mass spectrometry in combination with mass spectrometry (tandem mass spectrometry) multiple stages of tandem mass spectrometry National Institute of Health (USA) National Institute of Standards ... To understand the need to interface liquid chromatography and mass spectrometry • To understand the requirements of an interface between liquid chromatography and mass spectrometry and the performance ... Quadrupole Mass Analyser 3.3.2 The (Quadrupole) Ion-Trap Mass Analyser 3.3.3 The Double-Focusing and Tri-Sector Mass Analysers 3.3.4 The Time-of-Flight Mass Analyser 3.4 Tandem Mass Spectrometry...

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current practice of gas chromatography mass spectrometry

Danh mục: Y - Dược

... Gas Chromatography Mass Spectrometry Analysis of Flavors and Fragrances M Careri and A Mangia 18 Gas Chromatography Mass Spectrometry for Residue Analysis: Some Basic Concepts H F De Brabander, ... Gas Chromatography Mass Spectrometry in the Petroleum Industry C S Hsu and D Drinkwater 55 Analysis of Dioxins and Polychlorinated Biphenyls by Quadrupole Ion-Trap Gas Chromatography Mass Spectrometry ... of Gas Chromatography Mass Spectrometry W M A Niessen Principles and Applications of Surface Ionization in Gas Chromatography Mass Spectrometry Toshihiro Fujii 31 Part II: Industrial and Environmental...

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Báo cáo khoa học: Angiotensin-converting enzyme inhibition studies by natural leech inhibitors by capillary electrophoresis and competition assay doc

Danh mục: Báo cáo khoa học

... pellet and peptides were analyzed by capillary zonal electrophoresis Samples (2 nL) were injected under vacuum into a PACE 5000 capillary electrophoresis system (Beckman) equipped with a silica capillary ... capillary zonal electrophoresis, several parameters have to be established Fig shows the capillary zonal electrophoresis proﬁle of FMRF-amide (internal standard), angiotensin II, angiotensin I and LORF ... °C and were terminated by addition of 1% triﬂuoroacetic acid (v/v) The internal standard FMRF-amide was added and samples were centrifuged at 20 000 g for 10 at °C Supernatants were collected and...

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Báo cáo Y học: Characterization of heparin binding by a peptide from amyloid P component using capillary electrophoresis, surface plasmon resonance and isothermal titration calorimetry ppt

Danh mục: Báo cáo khoa học

... collected material was lyophilized and the peptide masses were subsequently veriﬁed by mass spectrometry on a Mariner ESI-TOF mass spectrometer equipped with a standard ion source (PerSeptive Biosystems, ... the electropherogram Mass spectrometry showed that the preparation contained approximately equal amounts of two components with monoisotopic masses of 1603.13 and 1585.34 The mass of 1603.13 is ... v3.2 software Buffers were ﬁltered and deoxygenated and all experiments were carried out at 25 °C CE and CE-based binding assays Immobilization of regular and scrambled AP peptides on carboxymethylated...

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