gas chromatography olfactometry evaluation of volatile compounds of roasted coffee beans
Preparative isolation and purification of six volatile compounds from essential oil of Curcuma wenyujin using high-performance centrifugal partition chromatography doc
Ngày tải lên :
07/03/2014, 21:20
... total of mg of curdione (1), mg of curcumol (2), 10 mg of germacrone (3), 18 mg of curzerene (4), mg of 1,8-cineole (5) and 17 mg of b-elemene (6) from the essential oil (300 mg) in 2.4 mL of the ... temperature Both of the upper and the lower phases were degassed for 30 by ultrasonication before use Aliquots of 300 mg of the essential oil were diluted by 2.4 mL of the mixed solution of lower phase ... pulsation of the column because of elevated pressure [9] When revolution speed was 1200 rpm and flow rate of the mobile phase was 2.5 mL/min, more than 50% of the stationary phase (upper layer of petroleum...
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DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf
Ngày tải lên :
22/03/2014, 14:20
... measured by injecting an aliquot of the concentrated extract into a high resolution fused silica capillary column of a gas chromatography/ mass spectrometry (GC/MS) system Compounds eluting from the ... base, and generating a list of tentatively identified compounds with their retention times and scan numbers The software must also allow integration of the ion abundance of any specific ion between ... leach organic compounds into the eluting solvent One liter of water should pass through the cartridge in about two hours with the assistance of a slight vacuum of about 13 cm (5 in.) of mercury...
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Determination of endocrine disrupting compounds in environmental samples using microextraction combined with gas chromatography mass spectrometry
Ngày tải lên :
16/09/2015, 17:12
... disrupting 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 ... and the effects of these EDCs on humans and wildlife Endocrine disruption mechanisms include antagonism of hormones and inhibition of the synthesis and metabolism of hormones Many of the known EDCs ... THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMISTRY NATIONAL UNIVERISITY OF SINGAPORE 2004 GAS PREFACE Endocrine disrupting compounds (EDCs) are defined as exogenous...
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RESEARCH ON THE CHANGE OF 2-AP AND OTHER VOLATILE COMPOUNDS IN PROCESSING BUN FROM RICE
Ngày tải lên :
28/08/2013, 16:28
... Quantification of 2-AP in pandan leaf: Fig System of the SPME extraction 732 Content of - AP in pandan leaf extracted by SDE was calculated as follows: Research on the Change of 2-AP and Other Volatile Compounds ... Investigating the changes of 2-AP and other volatile compounds of rice in Bun processing Table The volatile compounds in non-soaking and 12 hours soaking of Khao Dawk mali recorded by GCMS N 12 hours ... (milled rice), and Black rice (mixture of several varieties) For the identification and quantification of change in 2-AP and other volatile compounds, milled rice of KDM was soaked in water for 12...
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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry
Ngày tải lên :
05/09/2013, 10:15
... 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 ... the Examination of Water Occurrence of EDTA in river water samples from three regions of Japan was examined EDTA was detected in ten of thirteen river water samples A high level of EDTA was observed ... ionization voltage of 70 eV and ion source temperature of 230ºC The instrument was operated in selected-ion monitoring (SIM) mode The monitor ion of EDTA and CyDTA were m/z of 174 (for identification...
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BÁO CÁO "RESEARCH ON THE CHANGE OF 2-AP AND OTHER VOLATILE COMPOUNDS IN PROCESSING BUN FROM RICE" doc
Ngày tải lên :
19/03/2014, 16:20
... Quantification of 2-AP in pandan leaf: Fig System of the SPME extraction 732 Content of - AP in pandan leaf extracted by SDE was calculated as follows: Research on the Change of 2-AP and Other Volatile Compounds ... Investigating the changes of 2-AP and other volatile compounds of rice in Bun processing Table The volatile compounds in non-soaking and 12 hours soaking of Khao Dawk mali recorded by GCMS N 12 hours ... (milled rice), and Black rice (mixture of several varieties) For the identification and quantification of change in 2-AP and other volatile compounds, milled rice of KDM was soaked in water for 12...
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Health Risks from Dioxin and Related Compounds Evaluation of the EPA Reassessment potx
Ngày tải lên :
22/03/2014, 16:21
... EPA’s Evaluation of Immunotoxicity of TCDD, Other Dioxins, and DLCs, 194 EPA’s Evaluation of Reproductive and Developmental Toxicity of TCDD, Other Dioxins, and DLCs, 195 EPA’s Evaluation of Other ... and Related Compounds Evaluation of the EPA Reassessment Copyright © National Academy of Sciences All rights reserved Health Risks from Dioxin and Related Compounds: Evaluation of the EPA Reassessment ... Department of Agriculture U.S Department of Health and Human Services v Copyright © National Academy of Sciences All rights reserved Health Risks from Dioxin and Related Compounds: Evaluation of the...
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Modern Practice of Gas Chromatography pdf
Ngày tải lên :
29/03/2014, 14:20
... Applications of Gas Chromatography Gas chromatography is a unique and versatile technique In its initial stages of development it was applied to the analysis of gases and vapors from very volatile ... solubilities) of the sample components between the two phases Gas- Sampling Valve A bypass injector permitting the introduction of a gaseous sample of a given volume into a gas chromatograph Gas Solid Chromatography ... nonlinear nonideal chromatography 34 2.1.8 THEORY OF GAS CHROMATOGRAPHY Linear Ideal Chromatography This is the most direct and simple theory of chromatography The transport of the solute down...
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Báo cáo khoa học " The nutrients of exotic mushrooms (Lentinula edodes and Pleurotus species) and an estimated approach to the volatile compounds " potx
Ngày tải lên :
28/06/2014, 11:20
... are of desirable taste and aroma One of the objectives of this research is the determination of volatiles of L edodes and Pleurotus spp (Oyster mushrooms) by estimating with the identification of ... In this research, volatiles of mushrooms estimated by the comparing library catalog of GS–MS (Table 4) We estimated the most of abundant volatile compounds and their % area of mushrooms in the ... Eicosamethylcyclodecasiloxane a 4.32 % Area of volatile compounds in the chromatogram K and Na contents of L edodes tent to increase after the first flush stage Average levels of K and Na of L edodes were 2348.24...
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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
Ngày tải lên :
13/08/2014, 15:21
... shows Page of the chromatographic profile of the water extract of mycelial AC Comprehensive chemical profile of AC The appropriate solvent should be used to extract as many groups of representative ... HPLC-DAD chromatograms of methanol extracts of two commercial mycelial products: crude mycelium and crude fruiting body of Antrodia camphorata For the sake of clarity, numbering of compounds is not ... samples Sample preparation and chromatography For the chromatographic profile of water extracts, 0.1 g of the sample was accurately weighed and extracted in ml of Milli-Q water under ultrasonication...
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evaluation of the odor compounds sensed by explosive-detecting canines_erica lotspeich
Ngày tải lên :
24/08/2014, 11:45
... Comparison of SPME Fiber Coatings 49 Figure 4.4 Confirmation of Odor Compounds 50 Figure 4.5 Confirmation of Odor Compounds 51 Figure 4.6 Confirmation of Odor Compounds ... and Copyright Disclaimer Title of Thesis/Dissertation: Evaluation of the Odor Compounds Sensed by Explosive-Detecting Canines Master of Science For the degree of ... training of canines Another area of uncertainty deals with the complexity of the odor generated by the explosive, as the headspace may consist of multiple chemical compounds due to the extent of explosive...
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ASTM D2887 Standard Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography
Ngày tải lên :
20/10/2014, 17:18
... 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 ... ambient temperature with carrier gas 9.2.1.3 Turn off the carrier gas and allow the column to depressurize completely 9.2.1.4 Seal off the open end (detector) of the column with an appropriate ... Inspect the chromatogram of the calibration mixture for evidence of skewed (non-Gaussian shaped) peaks Skewness is often an indication of overloading the sample capacity of the column that will...
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Characterization of volatile compounds in selected citrus fruits from asia
Ngày tải lên :
11/09/2015, 09:11
... threshold of volatiles, synergistic effect between volatiles and the interaction of non -volatile with volatile flavour compounds (Nisperos-Carriedo and 21 Shaw, 1990) The volatile compounds present ... Separation of flavour compounds Upon isolation of the volatile compounds by any of the above mentioned techniques, the compounds need to be separated and identified for characterization Gas chromatograph ... number of species, and are more diverse than other citrus groups (Hodgson, 1967) As a result, various cultivars of mandarins have distinct profiles of volatile compounds even though all of them...
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Implementation of a drug discovery tool for the evaluation of anti fibrotic compounds application in fibrovascular disorders
Ngày tải lên :
09/10/2015, 11:07
... concept of exclusion volume.19 Figure 2.8 Schematic depiction of the predicted dependence of reaction rate on the concentration of crowding agent…………………………………21 Figure 2.9 The structure of DexS ... blotting of the medium and the cell layer fraction of HSF culture……………………………………………………………… 67 Figure 4.17 The schematic drawing of the effect of volume exclusion in the distribution of procollagen ... inhibition of the lysyl oxidase by β-APN……………………….69 Figure 4.19 The effect of DexS on the deposition of exogenous collagen……… 71 Figure 4.20 The deposition of collagen following the addition of the...
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Kinetic changes of volatile compounds during longan juice fermentation with single and mixed cultures of yeasts
Ngày tải lên :
08/11/2015, 17:24
... has both volatile compounds and nonvolatile compounds including organic acids, sugars, vitamins, amino acids 2.1.2 Volatile compounds 2.1.2.1 Volatile compounds in longan juice Volatile compounds ... carry out the cofermentation of longan juice with the aim of exploiting the positive roles of both yeasts Two inoculation ratios of yeasts are compared in terms of their effects on the volatile flavour ... of wine quality Chapter is a review of literature on the nutritional compounds of longan (including non -volatile and volatile compounds) and the fermentation of longan juice to produce longan wine,...
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JOURNAL OF CHROMATOGRAPHY LIBRARY - VOLUME 24 chemical methods in gas chromatography
Ngày tải lên :
06/10/2016, 09:25
... JOURNAL OF CHROMATOGRAPHY LIBRARY - VOLUME 24 chemical methods in gas chromatography This Page Intentionally Left Blank JOURNAL OF CHROMATOGRAPHY LIBRARY - volume 24 chemical methods in gas chromatography ... destruction of involatile organic compounds reagents are used that ensure the selective separation of the whole compound into its component parts This special area of the analysis of involatile compounds ... masking of the peaks of trace components by the broad zone of the main component To separate the zone of trace components from that of the main components, which may contain various types of compounds, ...
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current practice of gas chromatography mass spectrometry
Ngày tải lên :
06/10/2016, 09:28
... Applications 14 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 ... Netherlands INTRODUCTION Gas chromatography mass spectrometry (GC–MS) is a combination of two powerful analytical tools: gas chromatography for the highly efficient gas- phase separation of components in ... confirmation of identity of these components as well as for the identification of unknowns In this introductory chapter, the principles of GC, MS, and GC–MS are described 1.1 History of Gas Chromatography Mass...
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Báo cáo y học: "Evaluation of the Prevalence of Concomitant Idiopathic Cyclic Edema and Cellulit"
Ngày tải lên :
25/10/2012, 10:51
... observation of cyclic edema demonstrated the success of the treatment and the need for its control, but we had no idea of the high prevalence of edema in the more advanced grades of cellulite The lack of ... were excluded An evaluation for idiopathic cyclic edema is routinely made in the diagnosis of cellulite, in obesity and in other evident causes of clinical edema The diagnosis of idiopathic cyclic ... and with the combination of drugs control of edema was attained Discussion This study illustrates the association of idiopathic cyclic edema with more advanced cases of cellulite There are no...
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Báo cáo y học: " Evaluation of Lumbar Facet Joint Nerve Blocks in Managing Chronic Low Back Pain: A Randomized, Double-Blind, Controlled Trial with a 2-Year Follow-U"
Ngày tải lên :
26/10/2012, 09:07
... the prevalence of low back pain of 162% with an annual increase of 11.6% The widely held belief that most of the episodes of low back pain will be short-lived, with 80% to 90% of these attacks ... lumbar radiofrequency neurotomy.29-31 The exact mechanism of the therapeutic effect of lumbar facet joint nerve blocks is not known, whereas radiofrequency neurotomy causes denaturing of the nerves ... Classification of Chronic Pain; Descriptions of Chronic Pain Syndromes and Definition of Pain Terms, 2nd ed; Task Force on Taxonomy of the International Association for the Study of Pain Seattle:...
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