gas chromatography mass spectrometry

... Milli-Q water was used in all experiments Gas chromatography/ mass spectrometry analysis Gas chromatography was carried out by using HP6890 series gas chromatography system (Hewlett Packard, Wilmington, ... 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 spetrometry ... 1995), and liquid chromatography/ tandem spetrometry (Quintana and Reemtsma, 2007) To simplify Japan’s recommended method of EDTA determination by using gas chromatography- mass spectrometry, we...

Ngày tải lên: 05/09/2013, 10:15

... base peak Low- to mid -mass sensitivity 197 50% of Mass 442 Mid -mass resolution and sensitivity 199 5-9% of Mass 198 Mid -mass resolution and ... (DECAFLUOROTRIPHENYLPHOSPHINE, DFTPP) Mass (M/z) Relative Abundance Criteria Purpose of Checkpoint1 51 10-80% of the base peak Low -mass sensitivity 68

Ngày tải lên: 22/03/2014, 14:20

... ghi.Các tín hiệu xử lý chuyển sang phận in lưu kết Process Flow Schematic Sample injection Carrier gas (nitrogen or helium) Long Column (30 m) Detector (flame ionization detector or FID) Air Hydrogen ... 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...

Ngày tải lên: 10/08/2014, 17:22

... 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 ... compounds GC Gas chromatography GC/MS Gas chromatography mass spectrometry HS-SPME Headspace-SPME HFM-SPME Hollow fiber protected-SPME HFM-LPME Hollow fiber protected-LPME LC Liquid chromatography ... WITH CHROMATOGRAPHY/ MASS SPECTROMETRY CHANBASHA BASHEER (M Sc.) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMISTRY NATIONAL UNIVERISITY OF SINGAPORE 2004 GAS PREFACE...

Ngày tải lên: 16/09/2015, 17:12

... Instrumentation of Gas Chromatography Mass Spectrometry Principles and Instrumentation of Gas Chromatography Mass Spectrometry W M A Niessen Principles and Applications of Surface Ionization in Gas Chromatography Mass ... Principles and Instrumentation of Gas Chromatography Mass Spectrometry W M A Niessen hyphen MassSpec Consultancy, Leiden, The Netherlands INTRODUCTION Gas chromatography mass spectrometry (GC–MS) is a ... On-Line Solid-Phase Extraction–Capillary Gas Chromatography Mass Spectrometry for Water Analysis Thomas Hankemeier and Udo A Th Brinkman Gas Chromatography Mass Spectrometry in Occupational and Environmental...

Ngày tải lên: 06/10/2016, 09:28

... Thr TIC ToF Trp TSP Tyr UV V vol/vol Val mass spectrometry in combination with mass spectrometry (tandem mass spectrometry) multiple stages of tandem mass spectrometry National Institute of Health ... performance) liquid chromatography in combination with mass spectrometry (high performance) liquid chromatography in combination with tandem mass spectrometry (high performance) liquid chromatography ... MAGIC MALDI MALDI–ToF max ent Met MID MIKES MRM MS Liquid Chromatography Mass Spectrometry gas chromatography – in combination with mass spectrometry N -acetylglucosamine glutamine glutamic acid...

Ngày tải lên: 11/04/2014, 06:58

... Chromatography, edited by Joseph Sherma and Bernard Fried 56 Gas Liquid–Solid Chromatography, V G Berezkin 57 Complexation Chromatography, edited by D Cagniant 58 Liquid Chromatography 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) ... concise introductions in liquid chromatography (Ch 1) as well as mass spectrometry (Ch 2) precede a general discussion on interfacing chromatography and mass spectrometry (Ch 3) Subsequently,...

Ngày tải lên: 04/06/2014, 15:33

... Alzheimer’s disease, Biomaterials 31 (2010) 4179–4185 [14] T.J Novak, R Helmy, I Santos, Liquid chromatography mass spectrometry using the hydrogen/deuterium exchange reaction as a tool for impurity identification ... 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 ... form, and two phenolic hydrogens and one aliphatic hydroxyl hydrogen of enol form are exchangeable Mass spectra of curcumin tautomers showed apparent differences (Fig 3) In positive detection, curcumin...

Ngày tải lên: 01/07/2014, 13:22

... nghiên cứu thành phần chất không khí Bản chất GC-MS, tên gọi nó, kết hợp Sắc ký khí (Gas Chromatography) Khối phổ (Mass Spectometry) Ngưỡng phát phương pháp picogram (0.000000000001 gram) Tuy nhiên, ... lượng hạt có khối lượng Thông tin sau chuyển đến máy tính Tại phép tính thực xuất kết gọi khối phổ (mass spectrum) Khối phổ biểu đồ phản ánh số lượng ion với khối lượng khác qua lọc Máy tính: Bộ phận...

Ngày tải lên: 02/07/2014, 09:20

... 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 F i ... detection are very sensitive to environmental condition The determination method by gas chromatography- mass spectrometry (GC-MS) has been reported [5] This method needs the derivatization procedures ... tiamulin (D) Simultaneous Determination of Various Macrolides by Liquid Chromatography/ Mass Spectrometry 107 Table Summarized mass spectra of the drugs used experiments D ru gs Ery th ro my cin Ro...

Ngày tải lên: 07/08/2014, 15:20

... by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers 37 Fig Structure of roxithromycin (left) and erythromycin (right) Fig Representative mass spectrum ... － － － － － － － －, not detected or under LOQ Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers 39 Ta ble Concentration ... Cecilia, A Confirmatory method for macrolide residues in bovine tissues by micro-liquid chromatography- tandem mass spectrometry J Chromatogr A 2001, 926(1), 97-104 Demotes-Mainaird, F., Vincon, G.,...

Ngày tải lên: 07/08/2014, 17:22

... 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 ... rapidly at higher light exposure and pH Furthermore, liquid chromatography- atmospheric pressure chemical ionization- ion trap mass spectrometry, coupled to microwave-assisted extraction technique,...

Ngày tải lên: 16/09/2015, 17:13

... was 0.1 s, with an 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, ... carbamate pesticides in environmental waters by using liquid chromatography- atmospheric pressure chemical ionization-ion trap mass spectrometry, coupled to microwave-assisted extraction technique, ... through the APCI source Mass spectra collected in full-scan mode were obtained by scanning over a range of m/z 50 to 250 Maximum injection time was set at 150 ms Time scheduled mass conditions were...

Ngày tải lên: 16/09/2015, 17:13

... (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 ... dichloromethane water a a 10 20 30 (min) 10 20 30 (min) Fig 4-4 (a) Chromatography of standard mixture of five carbamates; (b-f) chromatography obtained after simulated MAE (6 heating at 95ºC, 80% ... acetonitrile-water (40:60) at a flow rate of 0.8 ml/min PAH analysis was performed on a Waters (Milford, Massachusetts, USA) 600E HPLC system equipped with a Waters 700 autosampler, a Waters 486 UV-VIS...

Ngày tải lên: 16/09/2015, 17:13

... (incandescent) and artificial UV lighting) For the first time, liquid chromatography- atmospheric pressure chemical ionization-ion trap mass spectrometry (LC-APCI-ITMS) was used to investigate the chemical ... through the API source Mass spectra collected in full scan mode were obtained by scanning over the range from 50 to 250 m/z Maximum injection time was set at 150 ms Time scheduled mass conditions were ... conditions were: 53 Positive APCI: vaporizer temperature 450°C, sheath gas flow rate 80 arb (arbitrary units), auxiliary gas flow rate 20 arb, discharge current µA, capillary temperature 150 °C,...

Ngày tải lên: 16/09/2015, 17:13

... Thermo Separation gradient HPLC system (Model SCM 1000) coupled to a Finnigan MAT LCQ ion-trap mass spectrometer (all ThermoQuest, San Jose, CA, USA) The instrument was initially tuned based ... manufacturer GC analysis was performed by a Hewlett-Packard (Palo Alto, CA, USA) 5890 Series II gas chromatograph equipped with a 63Ni electron-capture detector Separations were conducted using ... 0.32 mI.D capillary column (0.25 µm stationary phase thickness) (J&W, Folsom, CA, USA) The carrier gas was purified nitrogen at a flow rate 1.5ml/min 44 2.2 REAGENTS Analytical-grade PAHs (naphthalene...

Ngày tải lên: 16/09/2015, 17:13

... Niessen, Liquid Chromatography- Mass Spectrometry (2nd edition), Marcel Dekker, Inc., New York, NY, USA and references therein, 1998 [2] R.D Voyksner, in Electrospray Ionization Mass Spectrometry: ... combination of chromatography (for separation) with mass spectrometry (as detector that provides sensitive and structural information) appears to be an obvious choice However, liquid chromatography ... liquid chromatography (HPLC) Mass spectrometry (MS), as one of LC detection techniques, has attracted growing interest because of the potential to yield information on the relative molecular mass...

Ngày tải lên: 16/09/2015, 17:13

... Thr TIC ToF Trp TSP Tyr UV V vol/vol Val mass spectrometry in combination with mass spectrometry (tandem mass spectrometry) multiple stages of tandem mass spectrometry National Institute of Health ... performance) liquid chromatography in combination with mass spectrometry (high performance) liquid chromatography in combination with tandem mass spectrometry (high performance) liquid chromatography ... MAGIC MALDI MALDI–ToF max ent Met MID MIKES MRM MS Liquid Chromatography Mass Spectrometry gas chromatography – in combination with mass spectrometry N -acetylglucosamine glutamine glutamic acid...

Ngày tải lên: 06/10/2016, 09:26

Ngày tải lên: 04/06/2014, 15:22