Results 151 to 160 of about 9,222 (182)

Determination of Essential Oils in Hops by Headspace Solid-Phase Microextraction

Journal of Agricultural and Food Chemistry, 1996
A solid-phase microextraction (SPME) method is described for the determination of the essential oils, humulene and caryophyllene, in the headspace of female hop cones and male hop lupulin samples. Optimized SPME sampling parameters for the determination of the humulene to caryophyllene (H/C) ratio for female hops (50 mg) and male lupulin (25 mg ...
Jennifer A. Field, Gail Nickerson, Derryl D. James, Chris Heider   +3 more
openaire   +1 more source

Determination of organophosphorus pesticides in soil by headspace solid-phase microextraction

Fresenius' Journal of Analytical Chemistry, 1999
Headspace solid-phase microextraction (SPME) has been developed for the analysis of common organophosphorus pesticides in soil. Factors such as adsorption-time, sampling temperature and matrix modification by addition of water were carefully considered to optimize the extraction efficiency.
W. F. Ng, Mui Jun Karen Teo, Hans-Åke Lakso   +2 more
openaire   +1 more source

Analysis of volatile fruit components by headspace solid-phase microextraction

Food Chemistry, 1998
Peer ...
Ibáñez, Elena, López-Sebastián, Sara, Ramos, Helena, Tabera, Javier, Reglero, Guillermo   +4 more
openaire   +2 more sources

Analysis of Flavor Volatiles Using Headspace Solid-Phase Microextraction

Journal of Agricultural and Food Chemistry, 1996
The 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
openaire   +1 more source

Headspace solid-phase microextraction analysis of 3-alkyl-2-methoxypyrazines in wines

Journal of Chromatography A, 2002
A procedure to determine 3-alkyl-2-methoxypyrazines in wines is described. It is based on the headspace solid-phase microextraction (HS-SPME) technique after a clean-up of the sample by distillation (previously acidified to pH 0.5) to remove ethanol and other volatile compounds that can interfere in the SPME.
C, Sala, M, Mestres, M P, Martí, O, Busto, J, Guasch   +4 more
openaire   +2 more sources

Determination of nerolidol in teas using headspace solid phase microextraction–gas chromatography

Food Chemistry, 2014
Nerolidol is an important volatile compound found in tea aroma, consumption of which has been associated with good health. A novel approach for the quantitative determination of nerolidol in teas has been developed using a headspace solid phase microextraction (HS-SPME) and a gas chromatography-flame ionization detector (GC-FID).
Ma, Chunhua, Qu, Yanqin, Zhang, Yingxue, Qiu, Bin, Wang, Yiru, Chen, Xi   +5 more
openaire   +3 more sources

Solid-Phase Microextraction Method Development for Headspace Analysis of Volatile Flavor Compounds

Journal of Agricultural and Food Chemistry, 2000
Solid-phase microextraction (SPME) fibers were evaluated for their ability to adsorb volatile flavor compounds under various conditions with coffee and aqueous flavored solutions. Experiments comparing different fibers showed that poly(dimethylsiloxane)/divinylbenzene had the highest overall sensitivity.
D D, Roberts, P, Pollien, C, Milo
openaire   +2 more sources

Headspace solid-phase microextraction for the determination of benzene, toluene, ethylbenzene and xylenes in urine

Journal of Chromatography B: Biomedical Sciences and Applications, 1999
A method for the determination of benzene, toluene, ethylbenzene and xylenes (BTEX) in urine of people exposed to these airborne pollutants present in the living environment, has been described. Solid-phase microextraction has been used for sampling BTEX from the headspace of urine and gas chromatography-mass spectrometry has been applied for the ...
S. Fustinoni, R.E.P. Giampiccolo, S.M.A. Pulvirenti, M. Buratti, A.L.P. Colombi   +4 more
openaire   +3 more sources

Headspace Solid-Phase Microextraction Method for the Study of the Volatility of Selected Flavor Compounds

Journal of Agricultural and Food Chemistry, 2002
Changes in the volatility of selected flavor compounds in the presence of nonvolatile food matrix components were studied using headspace solid-phase microextraction (HS-SPME) combined with GC-MS quantification. Time-dependent adsorption profiles to the SPME fiber and the partition coefficients between different phases were obtained for several ...
Da-Mi, Jung, Susan E, Ebeler
openaire   +2 more sources

Studies on the aroma of cupuassu liquor by headspace solid-phase microextraction and gas chromatography

Journal of Chromatography A, 2004
Headspace solid-phase microextraction (HS-SPME) coupled to gas chromatography with ion trap mass spectrometric detection and with atomic emission detection (GC-AED) was employed to identify possible odor-impact volatile organic compounds in cupuassu (Theobroma grandiflorum Spreng) liquor, as well as to quantify alkylpyrazines present in these samples ...
Ana Maria, de Oliveira, Nádia Rosa, Pereira, Antonio, Marsaioli, Fabio, Augusto   +3 more
openaire   +2 more sources