Gas chromatography

In this report, the solid phase extraction technique combined with the gas chromatographymass spectrometry method (GC-MS) was optimized to determine the contamination of nine phthalic acid esters (PAEs) in the surface sediment samples collected from Rao Cai River in Ha Tinh, Vietnam.

7p vifilm 11-10-2024 0 0   Download

Unsaturated polyester resin (UPR) condensate water contains biodegradable organic compounds, including those that create unpleasant odor. Those odors can adversely impact the environment, human health, and, most of all, the uncomfortably.

7p vikwong 29-09-2024 3 1   Download

The catalytic activity and product selectivity were determined by using a gas chromatography coupled with a mass selective detector. Our study suggests that the oxidation reaction in water could be catalyzed by gold with the presence of weak-base solids.

9p vikwong 29-09-2024 1 1   Download

Essential oil (EO) from leaves of Eucalyptus robusta was extracted by hydrodistillation, and analyzed the chemical composition using gas chromatography- Flame ionization detector (GCFID), and gas chromatography/mass spectrometry (GC/MS).

7p viling 27-09-2024 4 2   Download

Cajuput oil is a traditional and famous product of Thua Thien Hue, it is considered as a potential product, contributing to the economic development of Thua Thien Hue. The aim of the present study was to apply GC to the determination of the main components of commercial cajuput oils from M. cajuputi species in the Thua Thien Hue province.

4p vifaye 20-09-2024 1 1   Download

Magnolia citrata Noot. & Chalermglin was collected in the Central Highlands of Vietnam and examined for its essential oils’ chemical compositions and antimicrobial activities. The essential oils were obtained from the leaves, twigs, and stem barks of M. citrata using hydrodistillation, then analyzed using Gas Chromatography-Mass Spectrometry (GC-MS) and evaluated for antimicrobial activities.

10p dianmotminh02 03-05-2024 3 2   Download

In this study, we used the reliable GC-FID/MS technique to analyze the methyl ester derivatives of 37 different kinds of fatty acids. The results showed that high saturated fat concentration in all samples was mostly palmitic acid, whereas the low unsaturated fatty acid content in the cis form was primarily oleic acid and linoleic acid. The amount of monounsaturated and polyunsaturated fats is quite low.

6p dianmotminh02 03-05-2024 2 2   Download

Trong báo cáo này, phương pháp phân tích Sắc ký khí ghép nối khối phổ (Gas Chromatography coupled Mass Spectroscopy - GC/MS) được sử dụng nhằm phân tích thành phần dạng khí sinh ra từ quá trình đốt cháy vải sợi cotton chưa qua xử lý, cũng như vải sợi cotton chống cháy xử lý bằng hệ phụ gia Pyrovatex CP, để từ đó thu được cái nhìn rõ nét hơn về tính an toàn của loại vật liệu này trong điều kiện sử dụng thực tế.

7p vimichaelfaraday 28-12-2023 9 5   Download

In this work, it was possible to observe the different profiles for the Pilsen, Witbier and IPA style beers, when quantifying the analytes methanol, ethanol, n-propanol, iso-butanol, 3-methyl1-butanol (iso-amyl alcohol), acetaldehyde, ethyl acetate and iso-amyl acetate. Pilsen beer, with low fermentation, presented the ethanol content in the same concentration range as Witbier beer, as expected, but with higher alcohols and lower esters than the other two.

4p mudbound 10-12-2021 13 0   Download

Bài giảng Phương pháp phân tích hiện đại - Chương 20: Một số phương pháp phân tích sắc ký (Phần 2) có nội dung trình bày về sắc ký khí GC (Gas Chromatography); nguyên tắc, hệ sắc ký khí, kỹ thuật thực nghiệm và ứng dụng sắc ký khí GC,... Mời các bạn cùng tham khảo chi tiết nội dung bài giảng!

58p bachtudu 10-11-2021 33 3   Download

Twelve volatile constituents were identified from Liverwort Porella densifolia (Hepaticae) collected at Ham Rong Mountain, Sapa, Lao Cai Province by gas chromatography/mass spectrometry (GC/MS). The volatile constituents including some monoterpenes (β-myrcene, α- pinene and camphene); two major sesquiterpenes, deoxopinguisone and bicyclogermacrene-2 were identified.

4p larachdumlanat127 20-12-2020 6 2   Download

In this study, behaviors of gas inside the extraction chromatography column were investigated through experiments and Computation Fluid Dynamics (CFD) simulation. N2 gas once accumulated as bubbles in the packed bed was hardly discharged by the flow of mobile phase.

8p christabelhuynh 31-05-2020 10 2   Download

Salicylaldehyde has many applications as an intermediate in chemical industries. Genus Filipendula is a potential source of salicycldehyde. Essential oils are prescribed for a variety of health problems by traditional systems of medicine, all over the world. In present study, leaf essential oil composition of Filipendula vestita (Wall. Ex G. Don) Maxim. (Family: Rosaceae) from Uttrakhand, India was analyzed using gas chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS) methods.

5p abcxyz123_02 03-03-2020 21 1   Download

Kỹ thuật sắc ký khí - khối phổ (gas chromatography/ mass spectrometry: GC/MS) được áp dụng rất hiệu quả trong chẩn đoán rối loạn sinh tổng hợp hormon steroid trên thế giới nhưng chưa được triển khai tại Việt Nam. Nghiên cứu này nhằm ứng dụng và thẩm định phương pháp định lượng steroid niệu bằng kỹ thuật GC/MS tại Việt Nam.

6p vihades2711 23-09-2019 52 4   Download

The comparative study of the content and structure characteristics of fucoidans from five Sargassum brown seaweed species in the south provinces of Vietnam was conducted. The yield of fucoidans was ca. 4% (w/w) based on dry seaweed. The percentage of sulfate and uronic acid content was determined by Scott method. Fucoidans were hydrolyzed with trifluoroacetic acid, acetylated and their L-fucose, D-xylose, D-rhamnose, D-mannose, D-glucose, and D-galactose contents were identified by gas chromatography. All polysaccharides isolated from Sargassum polycystum C. Agardh, S. mcclurei Setchell, S.

4p uocvong04 24-09-2015 77 8   Download

In this study, an effective and relatively simple analytical procedure to determine morphine in urine samples were developed. The procedure includes: (1) liquid-liquid extraction of urine samples with a solvent mixture of chloroform and isopropanol (v/v = 9 : 1) at pH = 8.5 - 9.0. This extraction technique yielded a high recovery in a range from 80% to 85% for morphine, and (2) qualification of morphine in the final extracts by using a Gas Chromatography equipped with a flame ionization detector (FID).

5p uocvong03 24-09-2015 66 4   Download

The polar glycolipids were isolated from the thermophilic bacteriaMeiothermus taiwanensisATCC BAA-400 by eth-anol extraction and purified by Sephadex LH-20 and silica gel column chromatography. The fatty acid composition of O-acyl groups in the glycolipids was obtained by gas chro-matography mass spectroscopy analysis on their methyl esters derived from methanolysis and was made mainly of C15:0(34.0%) andC17:0(42.3%) fattyacids,withthemajority as branched fatty acids (over 80%).

7p awards 05-04-2013 41 1   Download

Prefractionation procedures facilitate the identification of lower-abundance proteins in proteome analysis. Here we have optimized the conditions for immobilized metal affinity chromatography (IMAC) to enrich for phos-phoproteins. The metal ions, Ga(III), Fe(III), Zn(II), and Al(III), were compared for their abilities to trap phosphoproteins; Ga(III) was the best.

12p galaxyss3 21-03-2013 38 3   Download

Requires improvements in the whole column: – Sub 2 μm particles Porous for optimum mass transfer New bridged hybrid particle required for pressure tolerance (up to 15000 psi) Sizing technology for narrow particle size distribution – Column hardware New frit technology to retain particles New end fittings for high pressure/low dispersion operation – Packing technology New column packing processes to optimize stability

23p qdung92ct 03-07-2012 62 7   Download

● Adsorption chromatography • The stationary phase is an adsorbent (like silica gel or any other silica-based packing) • The separation is based on repeated adsorption-desorption steps. ● Normal-phase chromatography • The stationary bed is strongly polar in nature (e.g., silica gel), and the mobile phase is nonpolar (such as n-hexane or tetrahydrofuran). • Polar samples are retained on the polar surface of the column packing longer than less polar materials.

28p qdung92ct 03-07-2012 82 11   Download