LIQUID CHROMATOGRAPHY–MASS SPECTROMETRY:AN INTRODUCTION

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

Analysis of keto enol tautomers of curcumin by liquid chromatography mass spectrometry
... number of exchangeable hydrogens of the enol form and the keto form are different Two phenolic hydrogens of keto form, and two phenolic hydrogens and one aliphatic hydroxyl hydrogen of enol form ... work was supported by the Research Fund for the Doctoral Program of Higher Education (No 20110002110052) References Fig Fragmentation of curcumin in keto form and enol form by negative MS/MS because ... peak represents an impurity of curcumin with a different structure or another form of curcumin, after fractionation of peak 2, a portion of the fraction was subjected to analysis again The chromatogram...
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Báo cáo khoa học: "Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry" pps

Báo cáo khoa học:
... corresponding with Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry 105 F i g T ot a l ion ch r om a t ogr a p h y (TI C, A) of m a cr olid e a n d t ia ... the simultaneous determination of macrolides The fragmentation patterns provide the confirmatory information of macrolides The relevance of these studies for the determination of macrolide in ... time for the determination of macrolides LC/ MS which omits the derivatization procedures was successfully applied to determine several macrolides Simultaneous determination methods by HPLC with...
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Báo cáo khoa học: "Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers" pdf

Báo cáo khoa học:
... Determination of Roxithromycin by Liquid Chromatography /Mass Spectrometry after Multiple-Dose Oral Administration in Broilers 39 Ta ble Concentration of roxithromycin in various tissues obtained ... Spectrometry after Multiple-Dose Oral Administration in Broilers 37 Fig Structure of roxithromycin (left) and erythromycin (right) Fig Representative mass spectrum of roxithromycin (as scan ... estimated by the linear regression analysis of the log-transformed tissue concentrations, and was determined at the time when the Determination of Roxithromycin by Liquid Chromatography /Mass Spectrometry...
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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

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
... study the degradation behavior in ultrapure water, drinking water, rain water, river water and seawater under various pH and irradiation sources (sunlight, darkness, indoor incandescent lighting and ... propham (66 %), which probably underwent thermal degradation under the extraction conditions The results indicate that although carbamates tested in this study are thermally labile, there was ... SFE Liquid chromatography- atmospheric pressure ionization- ion trap mass spectrometry was used to investigate the chemical degradation behavior of N-methylcarbamate in environmental water samples...
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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

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
... freedom for the assignment of the variables under consideration The assignment of the main variables (A, B, C and D), two-variable interaction, and the level setting values of the main variables ... optimization of the MAE conditions To apply these techniques in practical applications, in this chapter I 138 demonstrated the application of these techniques in analysis of the residues of Nmethylcarbamate ... the average recovery (AR) results that the combination of A1 and B2 would result in a maximum response Since effects of duration time and volume of the solvents (factors C and D) are minor, less...
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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

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
... 88 An interesting result observed from Fig 4- 6 is that in the same solvent, the recovery increases in going from PAHs to PCBs, and then to triazines (i.e, increasing polarity of analyte) The recovery ... 88.1±3.7 89.8±3.2 91 .4 3.0 93.5 4. 5 41 .0±3.8 18 .4 4. 0 10 80.0±3.6 84. 2 4. 5 89.2±5.0 90.2 4. 0 93.2±2.9 94. 6±3.7 36.8±2.8 15.2±2 .4 15 79 .4 5.0 84. 6±3.6 86.6±3.6 87.9 4. 7 94. 5 4. 5 96.2 4. 2 30.6±3.8 12.1±3.0 ... Hexane-acetone (1 :4) 47 .5 4. 2 48 .6 4. 3 48 .3 4. 0 46 .4 4. 5 49 .2 4. 4 Hexane-acetone (1:1) 36.2±3.0 35.9±2.9 41 .0±3.8 37.2±3.1 40 .1 4. 2 Dichloromethane 24. 2±2.9 23.6±3.0 26.0±2.8 24. 9 4. 6 26.6±5.5 a Soil-1,...
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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

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
... 160.9 31 8.2 250.6 53. 3 3. 07 2.1 1. 43 60 52 45 * at pH 10.5, units of k and t1/2 are s-1 and s, respectively a incandescent lighting 64 3. 3 .3 Degradation of Propoxur in Natural Water In order to provide ... light intensity affects the K and in each natural water sample K increases and t½ decreases accordingly when the light intensity increases in the order of darkness, indoor lighting and sunlight ... application of LC-APCI-MS for the determination of carbamates: carbofuran and 3hydroxy-carbofuran, and the analysis of triazine herbicides in water [8] LC-ESI-MS has...
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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

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
... levels of the target analysts in soil samples before spiking 2. 3 .2. 2 Freshly spiked soils Freshly spiked soil samples were prepared by adding an appropriate volume of spiking solutions into the ... possible traces of PAHs, PCBs, triazines, carbamates and other organic contaminants, 100 g of each of the soil sample was immersed in 20 0 ml 46 each of methanol, acetone, dichloromethane and n-hexane ... purchased in a local market In order to remove possible trace organic contaminants prior to preparation, all of them were washed in fresh running water and then rinsed with deionized water The fish samples...
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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

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
... From Table 1- 5, it can be seen that various classes of pesticides have been determined by employing either LC-ESI-MS [11 1 -11 7, 12 1, 12 3] or LC-APCI-MS [11 8, 11 9, 12 2] The combination of SPE with ... ESI–PI–MS 5 10 11 6 GW off-line, 1L, SPE, ESI–NI–MS 5 10 11 5 SW off-line, 0.2L, SPE, ESI–PI–MS 20–30 11 7 Imidazolinone DW off-line, 2L, SPE, ESI–PI–MS about 11 3 Phenoxy acid GW off-line, 1L, SPE, ... 1L, SPE, ESI–NI–MS 10 –20 11 6 SW off-line, 1L, SPE, ESI–PI–MS 1 20 11 1 SW off-line, 0.2L, SPE, ESI–PI–MS 13 –40 11 2 Sulfonylurea GW off-line, 2L, SPE, ESI–NI–MS 5 10 11 4 Triazine, Phenylurea GW...
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DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf

DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf
... METHOD 525.2 DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY 1.0 SCOPE AND APPLICATION 1.1 This ... procedures for determination of organic compounds in finished drinking water, source water, or drinking water in any treatment stage The method is applicable to a wide range of organic compounds that ... portion of the sample into the solvent reservoir The water sample will drain into the cartridge, and from the exit into the suction flask Maintain the packing material in the cartridge immersed in water...
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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry

Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry
... concentration of EDTA (443 μg/L) was observed in a Table - Table – Recovery of EDTA fromtap water samples and tap water Recovery of EDTA from Milli-Q water and Milli-Q water Recovery of triplicate samples ... an EDTA analytical method to the Japanese Standard Methods for the Examination of Water Occurrence of EDTA in river water samples from three regions of Japan was examined EDTA was detected in ... shown in Fig 2, EDTA was detected in ten of thirteen river water samples Although EDTA was not detected from river water samples of Kagami, Yoshino, and Kamo rivers (concentration: < 0.1 μg/L), EDTA...
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Gas Chromatography Mass Spectrometry doc

Gas Chromatography Mass Spectrometry doc
... 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...
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