quantification of fresh tomato odorants by gas chromatography mass spectrometry

... solutions were of analytical grade Milli-Q water was used in all experiments Gas chromatography/ mass spectrometry analysis Gas chromatography was carried out by using HP6890 series gas chromatography ... simplify Japan’s recommended method of EDTA determination by using gas chromatography- mass spectrometry, we focused on the pretreatment of EDTA by using solid-phase extraction in the present study ... recommended method of EDTA determination to a simplified method by using gas chromatography/ mass spectrometry, a new solid-phase extraction method of EDTA was developed Satisfactory results were obtained...

Ngày tải lên: 05/09/2013, 10:15

... 10-80% of the 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 ... (DECAFLUOROTRIPHENYLPHOSPHINE, DFTPP) Mass (M/z) Relative Abundance Criteria Purpose of Checkpoint1 51 10-80% of the base peak Low -mass sensitivity 68 50% of Mass 198 High -mass resolution...

Ngày tải lên: 22/03/2014, 14:20

... 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 the solution structure of curcumin, J Nat Prod 70 ... than that of main peak (1.45 min) A computational approach was tried to determine the stable structure of curcumin by Kolev et al [16] They proposed that the most stable configuration of the enol ... because of the retentive properties according to the size of molecules onto the ODS surface For further identification of the peaks and 2, MS/ MS experiments were conducted MS/MS spectra of these...

Ngày tải lên: 01/07/2014, 13:22

... 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 m u lin ... method by gas chromatography- mass spectrometry (GC-MS) has been reported [5] This method needs the derivatization procedures for each macrolide, thus taking a long time for the determination of macrolides ... 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

... tissues by LC-MS has been established The limit of detection and limit of quantitation were ng/g and ng/g These values satisfied the acceptance criteria of the limit of detection and limit of quantitation ... 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 after Multiple-Dose ... or under LOQ Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers 39 Ta ble Concentration of roxithromycin in various...

Ngày tải lên: 07/08/2014, 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 ... LIST OF PUBLICATIONS [1] C Basheer, H K Lee, J P Obbard Determination of organochlorine pesticides in seawater using liquid-phase hollow fibre membrane microextraction and gas chromatography- mass...

Ngày tải lên: 16/09/2015, 17:12

... Applications of Gas Chromatography Mass Spectrometry in Clinical and Forensic Toxicology and Doping Control Hans H Maurer 355 15 Detection of Drugs of Abuse by Gas Chromatography Mass Spectrometry ... Analysis by Gas Chromatography Mass Spectrometry Stefan A Wudy, Janos Homoki, and Walter M Teller 309 13 Gas Chromatography Mass Spectrometry for Selective Screening for Inborn Errors of Metabolism ... Applications 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...

Ngày tải lên: 06/10/2016, 09:28

... 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

... i-C14) Summary of Test Method 4.1 The boiling range distribution determination by distillation is simulated by the use of gas chromatography A nonpolar packed or open tubular (capillary) gas chromatographic ... (2) relative response factor, mass of the n-paraffin in the mixture, peak area of the n-paraffin in the mixture, mass of the n-decane in the mixture, and peak area of the n-decane in the mixture ... distribution of petroleum fractions by gas chromatography has no bias because the boiling range distribution can only be defined in terms of a test method 14.2.1 A rigorous, theoretical definition of the...

Ngày tải lên: 20/10/2014, 17:18

... TABLE OF CONTENTS TABLE OF CONTENTS Page ACKNOWLEDGEMENTS i TABLE OF CONTENTS .ii SUMMARY vi LIST OF TABLES ix LIST OF FIGURES xi LIST OF ... Drying of spheroids .35 2.7 Characterization of spheroids .35 2.7.1 Size analysis by sieving .35 2.7.2 Sizing by image analysis 36 2.7.3 Roundness quantification by ... fitting of size distribution of RT(SR) spheroids to statistical distributions 114 Table 21 Size distribution of RT(SR) spheroids as defined by 3cMG distribution 118 x LIST OF FIGURES LIST OF...

Ngày tải lên: 11/09/2015, 16:05

... derivative of the chain-extension ACP, despite the presence of the free thiol form of the domain The nature of the diketide adduct in this experiment was determined by treatment of a sample of the ... its normal starter acyl unit is clearly regulated by the rate of release of the diketide product by the TE domain Studies of the extent of loading of multienzymes with more than one module are needed ... domains of purified DEBS possess a slow methylmalonyl-CoA Identification of rate-limiting steps, and a model for suppression of iteration and the maintenance of fidelity of reduction In the presence of...

Ngày tải lên: 16/03/2014, 03:20

... 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

... recovery of the carbamates was above 94% with good reproducibility under optimum MAE conditions SFE was optimized by a two-level OAD procedure Recoveries of the analytes from spiked soil by SFE ... better recoveries than SFE Liquid chromatography- atmospheric pressure ionization- ion trap mass spectrometry was used to investigate the chemical degradation behavior of N-methylcarbamate in environmental ... liquid chromatography- atmospheric pressure chemical ionization- ion trap mass spectrometry, coupled to microwave-assisted extraction technique, was also been applied to analyze the residues of N-methylcarbamate...

Ngày tải lên: 16/09/2015, 17:13

... 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 of ... Volume of extraction solvent; B x C: Interaction between extraction temperature and time 5.2.3.2 MAE procedures and the treatment of extracts For every sample in each species extracted by MAE, g of ... considered, a total of five degrees of freedom was required, and the OA (2 7) matrix was, therefore, chosen so as to have sufficient degrees of freedom for the assignment of the variables under...

Ngày tải lên: 16/09/2015, 17:13

... 10 µl of the solution was directly analyzed by HPLC In order to examine the thermal degradation behavior of carbamates, the following was performed: ml of standard solution containing ppm of propoxur, ... comparison of extraction behaviors of different pollutants in soil extracted simultaneously in the same extractant by using MAE This was one aspect of our present work The MAE recoveries of some ... used 89 4.1.3.5 Influence of matrix, moisture, aging of spiked soil on recovery of tested pollutants The effects of matrix, moisture and aged spiked soil on recovery of analytes were investigated...

Ngày tải lên: 16/09/2015, 17:13

... 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 ... aqueous samples by using LC-APCI-ITMS were carried out in this study Our aims were as follows: (1) To identify the major TPs of propoxur by mean of LC-API-ITMS The performance of two MS ionization ... chromatograms of TPs of propoxur using LC-APCI-ITMS and LCESI-ITMS (a) transformation products by positive ESI (b) transformation products by positive APCI (c) transformation products by negative...

Ngày tải lên: 16/09/2015, 17:13

... detectable 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 ... order to remove possible traces of PAHs, PCBs, triazines, carbamates and other organic contaminants, 100 g of each of the soil sample was immersed in 200 ml 46 each of methanol, acetone, dichloromethane ... use Freshly spiked water samples were prepared by adding an appropriate volume of spiking solutions into the natural water samples prepared above and ultrapure water All the samples were degassed...

Ngày tải lên: 16/09/2015, 17:13

... GC-MS The separation by time provided by an HPLC system, combined with the separation by mass achieved by an MS often enables a 31 chemist to acquire structural information of specific impurities ... technique for the analysis of mixtures that, often contain unknowns and/or analytes in low concentration, the combination of chromatography (for separation) with mass spectrometry (as detector ... preferred over gas chromatography (GC) in analysis of samples with high polarity and low volatility In contrast, one of the prerequisites for mass spectrometric analysis is the formation of volatilized...

Ngày tải lên: 16/09/2015, 17:13

... QC Q-ToF Q-ToF–LC–MS–MS RF RIC RMM RSD S/N SDM SD SDS–PAGE Ser SIM SIR SRM TFA Thr TIC ToF Trp TSP Tyr UV V vol/vol Val mass spectrometry in combination with mass spectrometry (tandem mass spectrometry) ... combination of chromatography and mass spectrometry (MS) is a subject that has attracted much interest over the last forty years or so The combination of gas chromatography (GC) with mass spectrometry ... interface liquid chromatography and mass spectrometry • To understand the requirements of an interface between liquid chromatography and mass spectrometry and the performance of the combined system...

Ngày tải lên: 11/04/2014, 06:58