chromatography mass spectrometry for progesterone measurement

... gas chromatography/ mass spectrometry Anal Chem 74:4878–4884 Barshick CM, Barshick SA, Walsh EB, Vance MA, Britt PF (1999) Application of isotope dilution to ion trap gas chromatography/ mass spectrometry ... for determination of the volatile oils is vitally important for quality control of the product Results:  A method coupling steam distillation/drop-by-drop extraction with gas chromatography? ? ?mass ... filtered through a 0.45μm micropore film prior to GC–MS analysis Gas chromatography/ mass spectrometry GC–MS analysis was performed using an Agilent 7890A gas chromatograph equipped with a DB-WAXetr...

Ngày tải lên: 29/05/2020, 12:34

... fluid chromatography Metabolites Amino acids Human plasma Mass spectrometry a b s t r a c t The applicability of ultrahigh-performance supercritical fluid chromatography coupled with mass spectrometry ... file size facilitating data handling The Accurate Mass Measure tool in MassLynx was used to apply lock mass correction for better mass accuracy and for the conversion of data from continuum to centroid ... reported in Tables S3–S10 for ammonium acetate and Tables S10–S11 for ammonium formate The average mass accuracy, selectivity, and resolution was slightly higher for ammonium formate than ammonium...

Ngày tải lên: 25/12/2022, 02:51

... applications, such as gas chromatography? ? ?mass spectrometry (GC–MS) [10–14], high-performance liquid chromatography (HPLC)—fluorescence detection [15–18] or tandem mass spectrometry (MS/MS) [19, ... quality data for the target PAHs in MCS Owing to the HR data acquisition mode enabling measurement of accurate mass, limits of quantification for PAHs were to 15-fold lower for GC–HRMS than for GC–MS/MS ... 1.5 ml/min Mass spectrometry The single-quadrupole mass analyser used for GC–MS was an Agilent Technologies 6890N GC system coupled to an Agilent 5973N Quadrupole Mass Spectrometer with Agilent Mass...

Ngày tải lên: 29/05/2020, 12:54

... Central Journal Open Access Comprehensive two‑dimensional gas chromatography? ? ?mass spectrometry combined with multivariate data analysis for? ?pattern recognition in Ecuadorian spirits Noroska Gabriela Salazar Mogollón1,2*, ... concentration limits for congeners and some toxic compounds are determined by the Ecuadorian norm INEN 2014 [4] The analyses are performed by conventional gas chromatography, which searches for the presence ... chromatograms Consequently, a comprehensive two-dimensional gas chromatography? ? ?mass spectrometry (GC  ×  GC–MS) is a powerful tool for overcoming this drawback, providing higher detectability as...

Ngày tải lên: 29/05/2020, 13:56

... gas chromatography with isotope dilution timeof-flight mass spectrometry for the measurement of dioxins and polychlorinated biphenyls in foodstuffs: comparison with other methods,” Journal of Chromatography ... comprehensive two-dimensional gas chromatographytime-of-flight mass spectrometry, ” Journal of Chromatography A, vol 1040, no 2, pp 227–238, 2004 NIST/EPA/NIH, ? ?Mass spectral library Mass Spectral Library ... time information for various columns that analysts could use as a reference for PCB column choice and methodology More recently, Reiner et al and Cochran demonstrated the use of fast gas chromatography...

Ngày tải lên: 02/11/2022, 09:28

... High Performance Liquid Chromatography 21 vi Liquid Chromatography? ? ?Mass Spectrometry 2.5 Quantitation Using High Performance Liquid Chromatography 23 2.6 The Need for High Performance Liquid Chromatography? ?? ... liquid chromatography in combination with Fourier-transform infrared (spectroscopy) (high performance) liquid chromatography in combination with mass spectrometry. .. with mass spectrometry ... Tyr UV V vol/vol Val mass spectrometry in... (high performance) liquid chromatography in combination with tandem mass spectrometry (high performance) liquid chromatography in combination...

Ngày tải lên: 11/04/2014, 06:58

... 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 ... ENVIRONMENTAL SAMPLES USING MICROEXTRACTION COMBINED WITH CHROMATOGRAPHY/ MASS SPECTROMETRY CHANBASHA BASHEER (M Sc.) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMISTRY ... 54 Coupled with Injection Port-Derivatization Gas Chromatography/ Mass Spectrometry Hollow Fiber Membrane-Protected Liquid-Phase Microextraction for 2.4 66 Seawater Samples Analysis Hollow Fiber...

Ngày tải lên: 16/09/2015, 17:12

... monitoring (SIM) was performed at m/z 60 ([M+H]+), 151([M-H]-) and 210 ([M+H]+) The dwell time for each channel was 0.1 s, with an interchannel delay of 0.02 s and a mass span of mass unit Quantitation ... under the peak from the mass chromatogram of the above molecular ions at m/z 60, 151, and 210 For the LC separation of propoxur and its two transformation products (N-methyl formamide and 2-isopropoxyphenol), ... roles as a carrier of propoxur and its TPs Therefore, evaluation and estimation of the potential risk of propoxur and its transformation products (TPs) for plants and animals in the aquatic environment...

Ngày tải lên: 16/09/2015, 17:13

... inside) and MAE was performed at 95 °C for at 80% power After the extraction, the vessel was allowed to cool down to room temperature before it was opened 4.1.2.3 HPLC measurements For triazines: A ... Extraction was performed at 115°C with a heating time of for PAHs and PCBs, or for triazines at 80% power After the extraction, the vessels were cooled down to room temperature before they were ... phase was 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...

Ngày tải lên: 16/09/2015, 17:13

... lighting (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 ... TP can be confirmed to be N-methyl formamide as the base 55 peak ([M+H]+) was obtained at m/z 60 by both mass techniques The other TP was 2isopropoxyphenol, for which the most intense [M-H]- ion ... 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 APCI 58 concentration...

Ngày tải lên: 16/09/2015, 17:13

... searching for a suitable 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 ... compounds Molecular weight information: confirmation for known compounds, identification for unknowns Structural information: controlled fragmentation in LC-MS allows for structural elucidation ... known as high performance 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...

Ngày tải lên: 16/09/2015, 17:13

... Performance Liquid Chromatography 7 10 10 11 12 14 16 18 21 vi Liquid Chromatography? ? ?Mass Spectrometry 2.5 Quantitation Using High Performance Liquid Chromatography 2.6 The Need for High Performance ... LIQUID CHROMATOGRAPHY? ?? MASS SPECTROMETRY: AN INTRODUCTION Robert E Ardrey University of Huddersfield, Huddersfield, UK LIQUID CHROMATOGRAPHY? ?? MASS SPECTROMETRY: AN INTRODUCTION ... 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...

Ngày tải lên: 06/10/2016, 09:26

... by Gas Chromatography- Mass Spectrometry: A Forensic Approach Shiona Croft 73 $33(1',; Ethyl Centralite standard The Analysis of Unfired Propellant Particles by Gas Chromatography- Mass Spectrometry: ... tool for forensic scientists Forensic Science International 102, 91101 Burns, D., Lewis, R (1995) Analysis and characterisation of nitroglycerinbased explosives by gas chromatography- mass spectrometry ... assessment for application to casework Part II Journal of Forensic Sciences 46 (3), 560-572 The Analysis of Unfired Propellant Particles by Gas Chromatography- Mass Spectrometry: A Forensic Approach...

Ngày tải lên: 07/08/2017, 15:46

... Linked Immunosorbent Assay GC-MS : Gas Chromatography Mass Spectrometry (Sắc ký khí ghép khối phổ) H2SO4dd : Acid sunfuric đậm đặc HPLC : High Performance Liquid Chromatography (Sắc ký lỏng cao áp) ... been made the topic: “Procedured development for the detecting and quantifing melamine content in milk powder, pet – food by Gas Chromatography – Mass Spectrometry? ?? Melamine is a nitrogen rich organic ... tích hàm lượng melamine sữa, thức ăn gia súc phương pháp sắc ký khí ghép khối phổ (Gas Chromatography – Mass Spectrometry) ” Melamine hợp chất hữu có hàm lượng đạm cao thêm vào thực phẩm hành vi...

Ngày tải lên: 22/07/2018, 01:16

... POLYCYCLIC AROMATIC HYDROCARBONS IN BARBECUED PORK USING QUECHERS EXTRACTION AND GAS CHROMATOGRAPHY – MASS SPECTROMETRY Nguyen Van Phuc1 Ho Chi Minh City University of Food Industry ARTICLE INFO ... this paper was to develop a process to analyze the content of 16 common PAHs in grilled pork by mass spectrometry (GC-MS) using standard internal substances Some specifications such as sample preparation ... related to the consumption of food for child, adolescent and adult with 2.63.10-7 and 9.3.10-7 the amount of BaP respectively Studies have shown that levels of exposure for human to BaP are 2-500ng/day...

Ngày tải lên: 09/02/2020, 09:07

... external calibration by Gas Chromatography - Selected Ion Monitoring - Mass Spectrometry (GC-SIM-MS) for all types of damage, reaching a good linearity for every quantified HIPV (for quantitation parameters ... transferred to the injector of a Gas Chromatography? ? ?Mass Spectrometry (GC-MS) system, or by liquid extraction with polar solvents DC-STE can be used successfully for both qualitative and quantitative ... MS operated in EI mode at 70 eV with a mass range from 35 to 350 amu in full scan mode Quantitative Gas Chromatography – Selected Ion Monitoring – Mass Spectrometry analysis (GC-SIM-MS): appropriate...

Ngày tải lên: 26/05/2020, 20:53

... gas chromatography mass spectrometry method Iltaf Shah2*  , James Barker1, Declan P. Naughton1, Stephen J. Barton1 and Syed Salman Ashraf2 Abstract  Background:  A gas chromatography mass spectrometry ... gas chromatography mass spectrometry Talanta 76:642–650 29 Kadowaki H, Shiino M, Uemura I, Kobayashi K (1984) Sensitive method for the determination of diclofenac in human plasma by gas chromatography- mass ... recoveries (around 83 %) for heptane and benzene [16–20] In short the developed and validated GCMS method for diclofenac satisfy all the criteria for US-FDA’s “Guidance for Industry Bioanalytical...

Ngày tải lên: 29/05/2020, 14:27

... efficiency of 2HG in mass spectrometry Chalmers et al.19 used chiral derivatization reagent of (D)-2-butanol and acetic anhydride to derivatize 2HG followed by gas chromatography/ mass spectrometry (GC/MS) ... important for accurate diagnosis of 2HG related diseases Here we developed a strategy by chiral derivatization combined with liquid chromatography- electrospray ionization-tandem mass spectrometry ... a novel strategy by chiral derivatization combined with liquid chromatography/ tandem mass spectrometry (LC-ESI-MS/MS) analysis for highly sensitive determination of onco-metabolites D-2HG and...

Ngày tải lên: 04/12/2022, 16:24

... determination by comprehensive two-dimensional gas chromatography (GC × GC) coupled to mass spectrometry (MS) Sample preparation of the volatile compounds, important for the organoleptic characteristics of ... utmost importance for the evaluation of their quality and their safety and for the understanding of their sensory properties [3,5,6] One-dimensional gas chromatography hyphenated to a mass spectrometer ... advantages of enhanced sensitivity [9] Additionally, GC × GC coupled to mass spectrometry (GC × GC–MS) forms a powerful analytical tool for the profiling and fingerprinting of food and beverage VOCs [11]...

Ngày tải lên: 20/12/2022, 21:29

... solvent (for ‘blank’ (supplemental information 1): 90:10:0.1 MilliQ water:acetonitrile:formic acid) was added Thereafter, 20 μL of non-labelled working solution (for calibration points and QCs for ... immunoprecipitation – liquid chromatography – triple quadrupole mass spectrometry (IP-LC-TQMS) assay was developed in our lab To achieve the selectivity and sensitivity, necessary for the detection of ... (supplemental information 1)) or blank solvent (90:10:0.1 MilliQ water:acetonitrile:formic acid, for CSF samples) was spiked The samples were vortex mixed and centrifuged at 20,0 0 × g for 10 (Heraeus...

Ngày tải lên: 25/12/2022, 02:39