Results 21 to 30 of about 208,364 (208)

Alkanes from plants of the genus achillea [PDF]

Journal of the Serbian Chemical Society, 1999
The hydrocarbon fractions of three species of Achillea L. have been analysed by capillary gas chromatography (GC) and GC-mass spectrometry(GC-MS) and were shown to consist of the conventional, odd-carbon number dominant distributions of n-alkane
Palić Radosav, Eglinton Timothy I., Benitez-Nelson Bryan C., Eglinton Geoffrey, Veliković Jasmina, Stojanović Gordana   +5 more
doaj   +3 more sources

Simultaneous analysis of saturated and unsaturated fatty acids present in pequi fruits by capillary electrophoresis

Química Nova, 2013
In the current study, an alternative method has been proposed for simultaneous analysis of palmitic, stearic, oleic, linoleic, and linolenic acids by capillary zone electrophoresis (CZE) using indirect detection. The background electrolyte (BGE) used for
Patrícia M. de Castro Barra, Marcone A. L. de Oliveira, Bárbara Nery-Enes, Leandro de M. Cardoso, Cristiane do C. Cesário, Ana V. B. Moreira, Helena M. Pinheiro-Sant'Ana, Maria do C. G. Peluzio   +7 more
doaj   +1 more source

Quantum Cascade Laser Enabled Nano-liter Polymer Waveguide Sensor [PDF]

, 2012
To improve the Mid-Infrared (IR) chemical sensing capabilities in liquids and gases, a polymer based waveguide that has 100% interaction with Quantum Cascade (QC) laser field is proposed and demonstrated.
Deev, Andrei, Wu, Sheng
core   +1 more source

Capillary gas-liquid chromatography of glycine-conjugated bile acids without prior hydrolysis.

Journal of Lipid Research, 1986
A method is described for the gas-liquid chromatographic (GLC) analysis of intact glycine conjugates of the major bile acids present in human plasma. It is, therefore, now possible to analyze glycine-conjugated and unconjugated bile acids together on a ...
J M Street, D J Trafford, H L Makin
doaj   +1 more source

Analytical methods in wineries: is it time to change? [PDF]

, 2005
A review of the methods for the most common parameters determined in wine—namely, ethanol, sulfur dioxide, reducing sugars, polyphenols, organic acids, total and volatile acidity, iron, soluble solids, pH, and color—reported in the last 10 years is ...
Andersen S. K., Anon, Arnes S., Belton P. S., Bi L. J., Billingsley A., Cardwell T. J., Cardwell T. J., Chen S. G., Chmilenko F. A., Cserhati T., Dai G. S., Dell´Oro V., Edberg U., Escobal A., Fang G. Z., Feng Z., Ga R. D., Gao Z. F., González-Rodríguez J., Guan J. R., Hu J. Y., J. González-Rodríguez, Kaufmann A., Kawamura Y., Kosir I. J., Kupina S. A., Lodi G., Luo H. Q., M. D. Luque de Castro, Mannino S., Miao J. G., Mou S., Olalla M., P. Pérez-Juan, Patz C. D., Polo M. C., Rapp A., Ribereau-Gayon J., Scollary G. R., Sebecic B., Vereda-Alonso E., Wang J. H., Wang J. S., Wang X. H., Wu X., Wu X. L., Yan J., Yu H., Zhang W., Zhang W., Zhou H.   +51 more
core   +1 more source

Untwisted restacking of two-dimensional metal-organic framework nanosheets for highly selective isomer separations

Nature Communications, 2019
Metal-organic framework nanosheets are promising for separations, but interactions among them, affecting the performance, are largely unexplored. The authors reveal the favored stacking modes in a model system, and that untwisted restacking by thermal ...
Ze-Rong Tao, Jian-Xiang Wu, Ying-Jie Zhao, Ming Xu, Wen-Qi Tang, Qing-Hua Zhang, Lin Gu, Da-Huan Liu, Zhi-Yuan Gu   +8 more
doaj   +1 more source

Thermal modulation for gas chromatography [PDF]

, 2007
A thermal modulator device for gas chromatography and associated methods. The thermal modulator device includes a recirculating fluid cooling member, an electrically conductive capillary in direct thermal contact with the cooling member, and a power ...
Block, Bruce P., Hasselbrink, Ernest F., Libardoni, Mark, Sacks, Richard D., Stewart, Kristine, Waite, J. Hunter   +5 more
core   +1 more source

Faster gas chromatography and its use in brewing. Part 2. - The determination of high volatile beer flavours after headspace extraction.

Kvasný průmysl, 2009
Using of faster gas chromatography is one way how the requirement of quick getting of results could be solved. Silica capillary columns with new size of internal diameter - 0.18 mm - are now available on the market. This study is focussed on applications
Tomáš HORÁK, Jiří ČULÍK, Marie JURKOVÁ, Pavel ČEJKA, Vladimír KELLNER, Josef DVOŘÁK, Danuša HAŠKOVÁ   +6 more
doaj   +1 more source

Complex formation and enantioselectivity studies of triazole fungicide and organophosphorus pesticide enantiomers using capillary electrophoresis [PDF]

, 2008
Several cyclodextrin modified-micellar electrokinetic chromatography (CDMEKC) methods were developed for the successful triazole fungicides separation.
Hermawan, Dadan, Sanagi, Mohd. Marsin, Wan Ibrahim, Wan Aini   +2 more
core  

Application of some modern sample preparation procedures for quantitative determination of vicinal diketones in beer.

Kvasný průmysl, 2009
The measurement of the content of the vicinal diketones in beer is important because these compounds, especially diacetyl, give beer a buttery off-flavour in concentrations above the flavour threshold.
Tomáš HORÁK, Jiří ČULÍK, Marie JURKOVÁ, Pavel ČEJKA, Vladimír KELLNER   +4 more
doaj   +1 more source