Results 181 to 190 of about 24,237 (229)
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Headspace solid‐phase microextraction analysis of artificial flavors
Journal of the Science of Food and Agriculture, 2005AbstractUsing a non‐equilibrated solid‐phase microextraction/gas chromatography/mass spectrometry technique, differentiation between a wide variety of types and examples of artificial flavors has been demonstrated. Addition of an internal standard to the samples, as received, allowed for the calculation of yields on a µg g−1 basis for the majority of ...
William M Coleman, Michael F Dube
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Analytical Chemistry, 1998
A solid-phase microextraction (SPME) method has been developed for the quantification of polychlorinated biphenyls (PCBs) in water samples. Parameters such as sampling time, volume of water, volume of headspace, temperature, addition of salts, and agitation of the sample were studied.
M, Llompart, K, Li, M, Fingas
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A solid-phase microextraction (SPME) method has been developed for the quantification of polychlorinated biphenyls (PCBs) in water samples. Parameters such as sampling time, volume of water, volume of headspace, temperature, addition of salts, and agitation of the sample were studied.
M, Llompart, K, Li, M, Fingas
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Solid Phase Microextraction for Quantitative Headspace Sampling of Apple Volatiles
Analytical Chemistry, 1996Solid phase microextraction (SPME) was evaluated for use in the quantification of aroma volatile production by Granny Smith apples during cool storage. Particular attention was paid to quantifying alpha-farnesene (3,7,11-trimethyldodeca-1,3(E),6(E),10-tetraene) due to its involvement in superficial scald, a disorder of cool stored apples.
A J, Matich, D D, Rowan, N H, Banks
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Determination of methanol in biodiesel by headspace solid phase microextraction
Bioresource Technology, 2008A new direct gas chromatography procedure (headspace solid phase microextraction) was developed for the quantitative determination of methanol in biodiesel. The analysis was performed by exposing a carboxen-polydimethylsiloxane SPME fiber assembly to the headspace of the biodiesel sample.
Maria C, Paraschivescu +4 more
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Rapid determination of organotin compounds by headspace solid-phase microextraction
Journal of Chromatography A, 2003Headspace solid-phase microextraction (SPME) followed by gas chromatography (GC) coupled to pulsed flame photometric detection have been investigated for the simultaneous speciation analysis of 14 organotin compounds, including methyl-, butyl-, phenyl-, and octyltins compounds. The analytical process (sorption on SPME fibre and thermal desorption in GC
Le Gac, M. +2 more
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Coupling of Dynamic Headspace Sampling and Solid Phase Microextraction
Chromatographia, 2004A simple lab-made apparatus allowing the use of a SPME fiber as sorptive device for isolation of analytes from varied samples using dynamic headspace sampling (DHS) is presented here. The principal parameters for the operation of this device - the extraction time and the flow of purging gas - were studied using aqueous test solutions of volatile and ...
R. C. Silva, P. M. S. Aguiar, F. Augusto
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Analysis of Flavor Volatiles Using Headspace Solid-Phase Microextraction
Journal of Agricultural and Food Chemistry, 1996The separation of target compounds from the sample matrix is a challenge to many analytical chemists. The extraction process is generally the step at which most analyte loss occurs; therefore, efficient methods of extraction are continually being sought.
Alexandra Steffen, Janusz Pawliszyn
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Headspace solid‐phase microextraction of cannabinoids in human head hair samples
Journal of Separation Science, 2007AbstractA fast method was optimized and validated with the aim to detect cannabinoids (cannabidiol, cannabinol, and Δ‐9‐tetrahydrocannabinol) in human head hair samples. The method was based on an initial procedure of external decontamination of hair samples (10 mg) with petroleum ether, followed by alkaline digestion and further extraction of ...
Carolina, Dizioli Rodrigues de Oliveira +2 more
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New cloud vapor zone (CVZ) coupled headspace solid-phase microextraction technique
Analytical and Bioanalytical Chemistry, 2007A new cloud vapor zone (CVZ)-based headspace solid-phase microextraction (HS-SPME) technique has been demonstrated with the capability of heating the sample matrix and simultaneously cooling the sampling zone. A bi-temperature-controlled (BTC) system, allowing 10 mL of test sample heating and headspace external-cooling, was employed for the CVZ ...
Yi-Ching, Huang +4 more
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Optimization of Headspace Solid Phase Microextraction Procedure for Trace Analysis of Toluene
International Journal of Occupational Safety and Ergonomics, 2008This study describes optimization of headspace solid phase microextraction followed by gas chromatography equipped with a flame ionization detector for toluene at trace level in spiked urine. The parameters affecting the extraction and gas chromatographic determination of analytes were studied: extraction time and temperature; desorption time and ...
Hamid-Reza, Heidari +4 more
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