Gas chromatographic

Part 1 book "Chromatographic methods" includes contents: Introduction, theoretical considerations, planar chromatography, liquid phase chromatography on open columns, gas chromatography.

269p dianmotminh01 14-05-2024 0 0   Download

Ebook "Multiscale molecular methods in applied chemistry" cover applied topics such as hierarchically structured materials, molecular reaction dynamics, chemical catalysis, thermodynamics of aggregated phases, molecular self-assembly, chromatography, nanoscale electrowetting, polyelectrolytes, charged colloids and macromolecules.

333p coduathanh1122 27-03-2024 3 1   Download

Ebook "Modified cyclodextrins for chiral separation" offers a review of the latest advances in developing modified cyclodextrins as chiral selectors for various chromatographic and electromigration techniques. Over the years, many descriptions of chiral separation have appeared in academic journals and books, but most of them have been devoted to either the development of analytical methods and protocols or the summary of different chiral selectors, including cyclodextrins for chiral separation applications.

265p coduathanh1122 27-03-2024 1 1   Download

Ebook "Characterization and authentication of olive and other vegetable oils: New analytical methods" presents new methods for the characterization of vegetable oils, with focus in olive oil, according to geographical and botanical origin, genetic variety and other issues influencing product quality. A wide variety of analytical techniques have been employed, such as various chromatographic techniques (different gas and liquid chromatography methods), an electronic nose, infrared spectroscopy and expert-panel evaluation.

229p coduathanh1122 27-03-2024 2 1   Download

Ebook "Green chromatographic techniques: Separation and purification of organic and inorganic analytes" presents a unified outlook on counter-current, ion size exclusion, supercritical fluids, high-performance thin layers, and gas and size exclusion chromatographic techniques used for the separation and purification of organic and inorganic analytes. It also describes a number of green techniques, green sample preparation methods and optimization of solvent consumption in the chromatographic analysis of organic and inorganic analytes.

220p nhanphanguyet 28-01-2024 3 2   Download

In this paper, volatile aroma compounds in Phka Rumduol (brown rice), cultivated by Cambodian Agricultural Research and Development Institute (CARDI) was analyzed by gas chromatograph mass spectrum (GCMS) and aroma extract dilution analysis (AEDA).

6p viisac 23-09-2023 1 0   Download

"Chromatographic fingerprint analysis of herbal medicines: Thin-layer and high performance liquid chromatography of Chinese drugs" provides a condensed overview of the analytical investigation of 80 Chinese Herbal Drugs which are most frequently in use. Thin layer chromatographic-, high pressure liquid chromatographic- and gas chromatographic-fingerprint analytical techniques allow the detection of all main low-molecular constituents of a plant drug and even single constituents can be visualized. This volume 1 is divided into 2 parts, please refer to part 2!

546p damtuyetha 16-02-2023 1 1   Download

Commercial gas chromatograph-mass spectrometers, one of which being Inficon’s HAPSITE® ER, have demonstrated chemical detection and identification of nerve agents (G-series) and blistering agents (mustard gas) in the field.

10p viginny 23-12-2022 6 3   Download

The amount of those newly revealed CBD transformation products depends on the GC injector temperature and on the extrahent type when extracts of the supernatants centrifuged from human plasma samples are analyzed after their preliminary protein precipitation by trifuoroacetic acid.

8p viginny 23-12-2022 7 3   Download

The photocatalytic hydrogen production of TiO2 is limited by the rapid rate charge recombination. The co-operation of CuxO (CuO or Cu2O) and TiO2 is an effective method to overcome this drawback. In this study, the CuxO/TiO2 composite structure is fabricated by hydrothermal method and chemical deposition technique.

8p viaudi 04-08-2022 5 1   Download

Sparsifloamide (1), a new sphingolipid, and sparsifloside (2), a new diglyceride galactoside, have been isolated from the ethyl acetate soluble fraction of the 80% ethanolic extract of the whole plant of Croton sparsiflorus Morong. Their structures were assigned by 1 H- and 13 C-NMR spectra and DEPT, COSY, NOESY, HMQC, HMBC, and ESI-MS experiments.

8p langthannam 29-12-2021 13 0   Download

A new, rapid, and sensitive gas chromatography–mass spectrometry (GC-MS) method was developed for the determination of ezetimibe (EZE) in human plasma. EZE was derivatized prior to GC-MS analysis. Various derivatization techniques such as acetylation, methylation, and silylation were tried. EZE was extracted from plasma with high recovery (94.39%–97.57%) using methyl tertbutyl ether and carbonate buffer (pH 9). Chromatographic conditions were optimized using chemometric methods.

12p langthannam 29-12-2021 9 0   Download

The strain Saccharomyces cerevisiae Bordeaux synthesized the most total aldehydes at a temperature of 24оС, while Saccharomyces cerevisiae 8-11 - at 28оС. Acetaldehyde, acetone and 2-butanone were identified in the experimental wines by gas chromatographic analysis. During the fermentation at a temperature of 20°C and 24°C, Saccharomyces cerevisiae Bordeaux produced more acetaldehyde, acetone and 2-butanone compared to 8-11. At 28°C Saccharomyces cerevisiae 8-11 produced more acetaldehyde and 2-butanone, 33.

6p mudbound 10-12-2021 6 1   Download

In this research, a series of La0.7Sr0.3Co1−yFeyO3−δ (y = 0.0–0.4) was successfully synthesized by a solidstate reaction method and syngas production studies were performed using gas chromatography. Thermogravimetric analysis characterized the concentration of Fe3+, which gave a low H2/CO ratio over La0.7Sr0.3Co1−yFeyO3−δ without the presence of molecular oxygen. All samples possessed a purely rhombohedral structure. The incorporation of more Fe increased the lattice parameter and changed XRD peaks of the La1−xSrxCo0.8Fe0.2O3 from sharp and single to double.

9p tudichquannguyet 29-11-2021 6 0   Download

The bio-recovery of three different oil-polluted tropical soils – RS (oil-polluted soil sample from River state), LS (soil sample from NNPC depot, Lagos) and POS (oil-polluted soil sample from Oriade L.G.A., Lagos) by manure amendment was studied for eight weeks. The rates of crude oil biodegradation after manure application as quantified by Gas chromatographic analysis of residual total petroleum hydrocarbon (TPH) showed the same trend of decrease in the total petroleum hydrocarbons in both the LS and RS series.

13p caygaocaolon7 18-09-2020 21 1   Download

Effect of lemongrass extract and oil on the bioactivity (antioxidant and antimicrobial property) and citral content of paneer was evaluated in this study. Lemongrass was incorporated in the following three ways: i) cut and crushed leaves were added to milk @ 0, 2, 4 and 6% (w/v) or to coagulant solution @ 20% (w/v) and extracted by heat treatment; ii) cut leaves were heat extracted in potable water followed by heat concentration, and chilling. The chilled water was used for soaking paneer blocks; iii) Lemongrass oil added to milk at 0, 0.015, 0.02 and 0.025% levels.

12p nguathienthan2 26-12-2019 21 0   Download

The trap was then heated to release volatile compounds including ethylmethylmercury into a GC-AFS for separation and detection. The instrumental detection limit was 4.8 pg Hg/L. The method can therefore be applied for the determination of methylmercury in water samples at ultra – trace.

8p elandorr 03-12-2019 18 0   Download

High resolution 1 H NMR spectroscopy, an increasingly available instrumental method, is used in undergraduate organic laboratory practice as a simpler alternative to gas chromatographic method for the direct determination of the p/o ratios of the crude reaction product from the nitration of alkylbenzenes. The choice of isopropylbenzene as a substrate illustrates that steric effect can be significant in controlling regioselectivity in electrophilic aromatic substitution reactions.

9p quilen 08-11-2019 18 0   Download

The species from the genus Ganoderma are known to be extremely important macrofungi in fundamental biological, medicinal and socioeconomic aspects. The present communication describes the brief morphological description, macro- and microscopic details and chemical constituents of the representatives of five species of Ganoderma mushroom collected from different sites in Vietnamese National Parks.

25p vikimsa 22-02-2019 16 1   Download

Phospholipid and triacylglycerol fatty acid compositions from eggs; seventh, eighth and last nymphal stages; and 1, 20- and 40-day-old adult females of the black cricket, Melanogryllus desertus, grown in stock–culture medium under laboratory conditions were analyzed by gas chromatographic methods.

6p vitamix 15-02-2019 13 1   Download