The effects of temperature and pressure on the performance of Carboxen/PDMS fibres during solid phase microextraction (SPME) of headspace volatiles from cooked and raw turkey breast

2001 ◽  
Vol 16 (4) ◽  
pp. 294-302 ◽  
Author(s):  
N. P. Brunton ◽  
D. A. Cronin ◽  
F. J. Monahan
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Headspace Volatiles ◽  
Effects Of Temperature ◽  
Temperature And Pressure

Use of the SPME-GC-MS technique to study the thermal degradation of isotactic polypropylene: Effects of temperature and reaction time, and analysis of the reaction mechanism

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Janina H. Bortoluzzi ◽  
Rodrigo Cristiano ◽  
Hugo A. Gallardo ◽  
Eduardo Carasek ◽  
Valdir Soldi
Keyword(s):  
Thermal Degradation ◽  
Isotactic Polypropylene ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Membered Ring ◽  
Chain Cleavage ◽  
Effects Of Temperature ◽  
Hydrogen Radical ◽  
A Chain ◽  
Concentrate Solid

AbstractCommercial fibers covered with poly(dimethylsiloxane) were used to pre-concentrate (solid phase microextraction technique) products evolved from the thermal degradation of isotactic polypropylene. Although the analysis by GC-MS indicated the formation of more than one hundred evolved products (ca. forty were identified), only twenty nine formed at 470°C (the temperature of maximum degradation rate for isotactic polypropylene) were analyzed. The main compounds identified were 2,4-dimethyl-1-heptene, 2-methyl-1-pentene, 2,3-dimethyl hexane, n-pentane and 1,3,5-trimethyl cyclohexane. The analysis at 470°C, using different degradation times, also indicated that the compounds 2-methyl-1-pentene and 2,4- dimethyl-1-heptene (major products) were formed at 15 and 25 minutes, respectively. The mechanism proposed for the formation of the major compounds was based on radical formation through chain cleavage (allyl and secondary radicals), followed by a chain decomposition process via hydrogen radical addition or cyclization to a thermodynamically stable six-membered ring.

Study on Timeliness of Gasoline Analysis Adsorbed in Cotton Cloth Carrier

2012 ◽  
Vol 616-618 ◽  
pp. 881-884
Author(s):  
Shu Jun Liu ◽  
Yong Hui Wang ◽  
Li Li Yu
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Wind Speed ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Cotton Cloth ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Effects Of Temperature ◽  
Gasoline Analysis

Study on the timeliness of gasoline analysis adsorbed in cotton cloth carrier was carried out with solid phase microextraction–gas chromatography/mass spectrometry(SPME-GC/MS), meanwhile the effects of temperature, wind speed and humidity on the timeliness of gasoline analysis adsorbed in cotton cloth carrier has been investigated. The results show that temperature is the major factor that affects the timeliness of analysis of gasoline, followed by humidity, and finally the wind speed, and the corresponding data of timeliness, derived equations and correlation are provided.

Eqilibrium Analysis of the TMGa-TMA1-AsH3-H2 Mocvd Epitaxial Growth System

1988 ◽  
Vol 131 ◽  
Author(s):  
Hyuk J. Moon ◽  
Thomas G. Stoebe ◽  
Brian K. Chadwick
Keyword(s):  
Gas Phase ◽  
Solid Phase ◽  
Total System ◽  
Method Of Calculation ◽  
System Pressure ◽  
Partial Pressures ◽  
Growth System ◽  
Effects Of Temperature ◽  
Temperature And Pressure ◽  
Thermodynamic Equilibrium State

ABSTRACTThe thermodynamic equilibrium state of the Ga-Al-As-C-H system was determined theoretically by means of an iterative equilibrium constant method. This method of calculation is presented and discussed. With very little operator input, the program is capable of computing the partial pressures of the gas-phase species present in the equilibrated system.In these calculations the system was considered to be saturated with solid-phase A1GaAs and included 58 plausible gas-phase intermediates which evolved from the initially present gas species; trimethylgallium, trimethylaluminum, arsine, and hydrogen. Temperature and total system pressure ranges investigated were 750–1100 K and 0.1 atm-1.0 atm, respectively. The effects of temperature and pressure variations, in addition to effects caused by changes in the appropriate atom ratios, have been delineated. The properties of this equilibrated system are compared with those from recent thermodynamic research efforts on AlGaAs systems consisting of only gaseous constituents.

Analysis of the Headspace Volatiles of Freshly Brewed Arabica Coffee Using Solid-Phase Microextraction

2007 ◽  
Vol 72 (7) ◽  
pp. C388-C396 ◽  
Author(s):  
M. Akiyama ◽  
K. Murakami ◽  
M. Ikeda ◽  
K. Iwatsuki ◽  
A. Wada ◽  
...  
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Headspace Volatiles ◽  
Arabica Coffee

Study on Sulfur Compounds in the Gasoline

2013 ◽  
Vol 423-426 ◽  
pp. 2367-2371
Author(s):  
Shu Jun Liu ◽  
Hao Nan Xu ◽  
Kun Feng ◽  
Ying Wang
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Sulfur Compounds ◽  
Organic Sulfur Compounds ◽  
Volatile Organic ◽  
Effects Of Temperature ◽  
Chemiluminescence Detector ◽  
Temperature Time ◽  
Optimum Extraction ◽  
Sulfur Chemiluminescence Detector

A procedure to quantify volatile, organic sulfur compounds in gasoline was developed using solid-phase microextraction to preconcentrate the analyses followed by GC and detection with a sulfur chemiluminescence detector (SCD). The effects of temperature, time and PDMS fibers types on the extraction of gasoline has been investigated. The results show that a range of sulfur compounds were identified in gasoline. 75um PDMS, 30min, and 50°C were the optimum extraction conditions. Using the developed method can be used to identify gasoline residues in the fire.

Optimization of the SPME-GC-MS Techniques for Analyzing Headspace Volatiles in Shrimp Head of P. borealis

2013 ◽  
Vol 726-731 ◽  
pp. 416-419
Author(s):  
Wan Cui Xie ◽  
Xin Lian ◽  
Xi Hong Yang ◽  
Ya Dong Yang ◽  
Dan Hui Mao
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
Extraction Temperature ◽  
Headspace Volatiles ◽  
Sample Extraction ◽  
Shrimp Head ◽  
Nitrogen Containing Compounds ◽  
Optimized Conditions ◽  
Sulfur Containing

To investigate the headspace volatiles in shrimp head P. borealis, optimized conditions were evaluated for solid-phase microextraction coupled to gas chromatography-mass spectrometry method. SPME fibers of 100-μm polydimetylsiloxane, 65-μm polydimetylsiloxane-divinylbenzene, 75-μm carboxen-polydimetylsiloxane, and 50/30-μm divinylbenzene-carboxen-polydimetylsiloxane (DVB/CAR/PDMS) were compared. The influence of several parameters such as type of fibers, volume of sample, extraction time, extraction temperature, and state of samples was systematically investigated. Suitable reproducibility and sensitivity were achieved by combining DVB/CAR/PDMS of 50/30-μm thickness as the liquid phase of SPME, 1.5 g of shrimp head lyophilized powder, 40 OC of isolation temperature and 40 min of isolation time. A total of 62 volatile compounds have been confirm, including hydrocarbons, ketones, alcohols, aldehydes, esters, nitrogen-containing compounds and sulfur-containing compounds. 3,5-octadien-2-one (E,Z), 3,5-octadien-2-one (E,E), 1-penten-3-one, 6-octen-2-one, ethyl acetate and alcohols such as 1-penten-3-ol, 2-penten-1-ol and 1-octen-3-ol were predicted as key compounds for SH flavor.

scholarly journals Comparison of Different Methodologies for Detailed Screening of Taraxacum officinale Honey Volatiles

2015 ◽  
Vol 10 (2) ◽  
pp. 1934578X1501000 ◽  
Author(s):  
Igor Jerković ◽  
Zvonimir Marijanović ◽  
Marina Kranjac ◽  
Ani Radonić
Keyword(s):  
Solid Phase Microextraction ◽  
Phenylacetic Acid ◽  
Solid Phase ◽  
Taraxacum Officinale ◽  
Phase Extraction ◽  
Benzene Derivatives ◽  
Headspace Volatiles ◽  
Aliphatic Compounds ◽  
Aliphatic Acids ◽  
Chemical Fingerprinting

Headspace solid-phase microextraction (HS-SPME), ultrasonic solvent extraction (USE) and solid phase extraction (SPE), followed by GC-FID/MS were used for screening of dandelion ( Taraxacum officinale Weber) honey headspace, volatiles and semi-volatiles. The obtained results constitute a breakthrough towards screening of dandelion honey since dominant compounds identified in the extracts were not previously reported for this honey type. Nitriles dominated in the headspace, particularly 3-methylpentanenitrile (up to 29.9%) and phenylacetonitrile (up to 20.9%). Lower methyl branched aliphatic acids and norisoprenoids were relevant minor constituents of the headspace. The extracts contained phenylacetic acid (up to 24.0%) and dehydrovomifoliol (up to 19.3%) as predominant compounds, while 3-methylpentanenitrile and phenylacetonitrile were detected in the extracts in minor abundance. Dehydrovomifoliol can be considered more characteristic for dandelion honey in distinction from phenylacetic acid. Low molecular aliphatic acids, benzene derivatives and an array of higher aliphatic compounds were also found in the extracts. The results of SPE/GC-FID/MS were very similar to USE/GC-FID/MS with the solvent dichloromethane. The use of all applied methodologies was relevant for the comprehensive chemical fingerprinting of dandelion honey volatiles.

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