gas chromatography mass spectrometry and gas chromatography olfactometry parameters
Tài liệu Báo cáo khóa học: Determination by electrospray mass spectrometry and 1H-NMR spectroscopy of primary structures of variously fucosylated neutral oligosaccharides based on the iso-lacto-N-octaose core doc
... °CÆmin)1 and to 310 °C at 10 °CÆmin)1 ES-MS Negative-ion ES-MS and CID MS/MS were carried out on a Micromass (Manchester, UK) Q-Tof mass spectrometer Nitrogen was used as desolvation and nebuliser gas ... pattern, sequence, and partial linkages, and assign structural details of each branch (e.g the 3- and 6-branches) Blood group H, Lea/Lex and Leb/Ley determinants, together with type and type chains, ... pattern and sequence analysis of underivatized oligosaccharides by combined MS/MS of singly and doubly charged molecular ions in negative-ion electrospray mass spectrometry J Am Soc Mass Spectrom...
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Báo cáo khoa học: Determination of thioxylo-oligosaccharide binding to family 11 xylanases using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and X-ray crystallography pot
... cyclotron resonance mass spectrometry: a primer Mass Spectrom Rev 17, 135 56 Smith RD (2000) Evolution of ESI -mass spectrometry and Fourier transform ion cyclotron resonance for proteomics and other biological ... using soft ionization mass spectrometry Int J Mass Spectrom 216, 127 54 Heck AJR & van den Heuvel RHH (2004) Investigation of intact protein complexes by mass spectrometry Mass Spectrom Rev 23, ... University of Technology, Helsinki, Finland) CTX was initially puried using cation-exchange and hydrophobicinteraction chromatography and characterized by SDS PAGE and ESI FT-ICR analyses as described...
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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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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry
... 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 ... chromatography/ mass spectrometry analysis Gas chromatography was carried out by using HP6890 series gas chromatography system (Hewlett Packard, Wilmington, DE, USA) with an HP6890 series auto sampler and ... 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...
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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 ... 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
... 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 ... 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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current practice of gas chromatography mass spectrometry
... 17 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, ... chapter provides a brief and general introduction to gas chromatography, to mass spectrometry, and to the techniques and applications of GC–MS GAS CHROMATOGRAPHY Gas chromatography is a physical ... Instrumentation 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 hóa học: " Method optimization and validation for the simultaneous determination of arachidonic acid metabolites in exhaled breath condensate by liquid chromatography-electrospray ionization tandem mass spectrometry" doc
... internal standard and b) without internal standard Figure the corresponded product the deuterated standards with Standard chromatogram of ion scans Standard chromatogram of the deuterated standards ... Leukotrienes LTB4 and LTE4as analytical standards and the labelled [2H4] LTB4 and [2H4] PGE2 as internal standards were purchased from Cayman Chemicals Company (Michigan, USA) All analytical standards ... specificity and detection related to structural information such as mass spectrometry Our developed method allows for a sensitive, specific and reliable determination of leukotriens and prostaglandins...
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Báo cáo y học: "Quality evaluation of mycelial Antrodia camphorata using high-performance liquid chromatography (HPLC) coupled with diode array detector and mass spectrometry (DAD-MS)" pps
... cytidine, and thymine [10,11,17,18]; maleic acid and succinic acid derivatives [6,19,20]; benzenoids [21]; phenol and tocopherols [8,22]; 5’-nucleotides [14]; and diterpenes [23] No chemical standardization ... coupled with diode array detector and mass spectrometry (HPLCDAD-ESI-MS) and to assess the quality of two commercial mycelial AC products Methods Plant Powdered mycelium and an intact fruiting body ... Qualitative and quantitative determination of nucleosides, bases and their analogues in natural and cultured Cordyceps by pressurized liquid extraction and high performance liquid chromatography- electrospray...
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Báo cáo y học: "Comparison of raw and processed Radix Polygoni Multiflori (Heshouwu) by high performance liquid chromatography and mass spectrometry" pptx
... and 5-hydroxymethyl furfural; P-RPM contains less amino acids and monosaccharides and has a lower pH value than R-RPM [31] In recent years, high performance liquid chromatography (HPLC) and gas ... 10%, 35% and 100%, at 0, 45 and 65 minutes respectively Detection was performed at 280 nm The mass spectra were detected in positive mode The flow rate of drying gas (N2 ) and nebulizing gas were ... raw and processed Radix Polygoni Multiflori (Heshouwu) by high performance liquid chromatography and mass spectrometry Chinese Medicine 2010 5:29 Submit your next manuscript to BioMed Central and...
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Identification of metabolites of meisoindigo from interspecies microsomes and in vivo biological fluids in rats by liquid chromatography tandem mass spectrometry
... feces collection and sample preparation……111 5.2.3 Chromatography and mass spectrometry conditions for rat plasma and feces………………………………………………………113 5.2.4 Chromatography and mass spectrometry conditions ... radioimmunoassay (RIA), gas chromatography coupled with mass spectrometry (GC-MS), liquid chromatography (LC) coupled with ultraviolet (UV), fluorescence, radioactivity or tandem mass spectrometry (MS/MS) ... factors and external factors (Gibson and Skett, 1994) Internal factors involve species, genetics, age, sex, hormones (e.g pituitary gland, sex glands, adrenal glands, thyroid gland, pancreas and...
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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
... 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
... 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
... soil preparation Analytical-grade PAHs (naphthalene and phenanthrene), PCB (PCB-1242 and PCB1248), triazine (atrazine 98% and simazine 99%), and carbamates (propoxur 99%, methiocarb 99%, propham ... Results and Discussion 4.1.3.1 Optimization of the solvents, microwave heating time and temperature With MAE, temperature, extraction time and suitable solvents appear to be the major parameters ... 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...
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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
... 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
... (PCB-1242 and PCB-1248) were purchased as individual standard stock solutions containing a nominal concentration of 100 µg/ml in methanol from Ultra-Scientific Atrazine (purity 98%) and simazine ... MA, USA) water purification system All the samples (solutions and extracts) were filtered through 0.45-m membranes (Millipore) and degassed in an ultrasonic bath before use 2.3 PROCEDURES 2.3.1 ... 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
... 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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