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article

Higher acclimation temperature modulates the composition of muscle fatty acid of Tor putitora juveniles

M.S. Akhtar, A.K. Pal, N.P. Sahu, A. Ciji, more

Weather and Climate Extremes > 2014 > 4 > Complete > 19-21

A 30-day acclimation trial was conducted using golden mahseer, Tor putitora juveniles to study its muscle fatty acid composition at five acclimation temperatures (AT). Ninety juveniles of T. putitora were distributed among five treatment groups (20, 23, 26, 29 and 32+/-0.5 ^o C). At the end of 30 days trial, highest percentage of monounsaturated fatty acids was found at 20 ^o C and lowest...

article

A chemometrics as a powerful tool in the elucidation of the role of metals in the biosynthesis of volatile organic compounds in Hungarian thyme samples

Jelena Arsenijević, Jelena Marković, Ivan Šoštarić, Slavica Ražić, more

Plant Physiology and Biochemistry > 2013 > 71 > Complete > 298-306

The volatile fraction of the leaves of Thymus pannonicus All. (Lamiaceae) was analyzed by headspace extraction followed by GC–FID and GC–MS analysis. The different headspace profiles were recognized, with citral and with monoterpene hydrocarbons as dominant compounds. In addition, the determination of Cr, Co, Ni, Mo, Cu, Zn, Mn, Fe, Mg, Ca, K and Na was conducted by spectroscopic techniques (FAAS,...

article

Sex differences in nicotine levels following repeated intravenous injection in rats are attenuated by gonadectomy

Steven B. Harrod, Rosemarie M. Booze, Charles F. Mactutus

Pharmacology, Biochemistry and Behavior > 2007 > 86 > 1 > 32-36

Previous research demonstrates that repeated intravenous (IV) nicotine injection resulted in increased locomotor sensitization in female relative to male rats. In order to determine if increased nicotine levels are detected in females compared to males the present experiment examined the plasma nicotine levels of male, female, castrated (CAST), and ovariectomized (OVX) rats (n=7–11 rats/group) following...

article

The analysis of e‐liquids: A study on chemical diversity and metal content using gas chromatography‐mass spectrometry and inductively coupled plasma‐mass spectrometry

Matjaž Rantaša, David Majer, Matjaž Finšgar

Journal of Separation Science > 47 > 17 > n/a - n/a

This work aimed to determine the chemical composition of 22 e‐liquids available on the Slovenian market. Four different gas chromatography (GC) sample introduction techniques; headspace‐GC‐mass spectrometry (HS‐GC‐MS), liquid injection‐GC‐MS (LI‐GC‐MS), HS‐solid‐phase microextraction‐GC‐MS (HS‐SPME‐GC‐MS), and direct‐immersion‐SPME‐GC‐MS (DI‐SPME‐GC‐MS) were employed for qualitative analysis. Various...

article

Generalized flow calculation of the gas flow in a network of capillaries used in gas chromatography

Jan Leppert, Tillman Brehmer, Peter Boeker, Matthias Wüst

Journal of Separation Science > 47 > 16 > n/a - n/a

A general method for the calculation of the flow and pressure of a gas in a network of cylindrical capillaries is presented. This method is used specifically for gas chromatographic systems in this work. With this approach, it is possible to easily calculate flow and pressures in complex gas chromatographic systems, like flow‐modulated or thermal‐modulated multidimensional gas chromatographic systems,...

article

Eryngial: An α,β‐Unsaturated Fatty Aldehyde as the Major Phytotoxin in Spiny Coriander (Eryngium foetidum L.) Essential Oil

Gitasree Borah, Begom Rifah Samia, Sajjad Hussain, Phirose Kemprai, more

Chemistry & Biodiversity > 21 > 8 > n/a - n/a

Weed species many times possess allelochemicals as a part of their survival strategy. These metabolites can be potential targets in search of natural phytotoxins. This study aims to evaluate the phytotoxic ability of fatty aldehyde‐rich essential oil from spiny coriander (Eryngium foetidum) leaves, also known as fitweed or spiritweed and to further identify the active phytotoxins. This oil dose‐dependently...

article

Effects of molecular interactions on the release of small molecules from silicone rubber

Yongcan Du, O. Thompson Mefford

Journal of Applied Polymer Science > 141 > 31 > n/a - n/a

Silicone rubber is a good candidate as a carrier of small molecules in such applications as drug, fragrance and semiochemical delivery. When one matrix is loaded, the molecular interactions between the molecules and the matrix may affect their release rates. For this reason, it is important to investigate the effects of molecular interactions on release to better develop delivery systems with desirable...

article

Development of an online hydrogen fuel quality analyzer with gas chromatography‐pulsed discharge helium ionization detector for applying hydrogen infrastructures

Dongkyum Kim, Miyeon Park, Sang Woo Kim, Younjeong Heo, more

Journal of Separation Science > 47 > 9-10 > n/a - n/a

Hydrogen fuel, which is essential for the hydrogen economy, including hydrogen cell vehicles, must be of high quality for optimal hydrogen cell use. Currently, hydrogen fuel quality control is mainly done by offline analysis with periodic sampling. However, with the anticipated surge in hydrogen charging stations, there's a pressing need for cost‐effective, high‐throughput online analysis systems...

article

A closer look at high‐energy X‐ray‐induced bubble formation during soft tissue imaging

R. Patrick Xian, Joseph Brunet, Yuze Huang, Willi L. Wagner, more

Journal of Synchrotron Radiation > 31 > 3 > 566 - 577

Improving the scalability of tissue imaging throughput with bright, coherent X‐rays requires identifying and mitigating artifacts resulting from the interactions between X‐rays and matter. At synchrotron sources, long‐term imaging of soft tissues in solution can result in gas bubble formation or cavitation, which dramatically compromises image quality and integrity of the samples. By combining in‐line...

article

Impact of post‐harvest drying on the volatile flavours of spiny coriander (Eryngium foetidum L.): Emphasis on fatty aldehyde reduction

Gitasree Borah, Bhaskar Protim Mahanta, Begom Rifah Samia, Siddhartha Proteem Saikia, more

Flavour and Fragrance Journal > 39 > 3 > 139 - 145

Spiny coriander (Eryngium foetidum L.) is a traditional food flavouring herb of tropics with coriander‐like odour. This study evaluated six different drying conditions (sun, shade, oven at 40°C and 60°C, microwave, freeze‐drying) for spiny coriander leaves, emphasizing on the drying time, essential oil yield and composition. Fatty aldehydes, especially trans‐2‐dodecenal, majorly abundant key aromatic...

article

What is the role of current mass spectrometry in pharmaceutical analysis?

Maria Khalikova, Jakub Jireš, Ondřej Horáček, Michal Douša, more

Mass Spectrometry Reviews > 43 > 3 > 560 - 609

The role of mass spectrometry (MS) has become more important in most application domains in recent years. Pharmaceutical analysis is specific due to its stringent regulation procedures, the need for good laboratory/manufacturing practices, and a large number of routine quality control analyses to be carried out. The role of MS is, therefore, very different throughout the whole drug development cycle...

article

Previtamin D₂, vitamin D₂, and vitamin D₄ amounts in different mushroom species irradiated with ultraviolet (UV) light and occurrence of structurally related photoproducts

Katrin Sommer, Marissa Hillinger, Walter Vetter

European Journal of Lipid Science and Technology > 126 > 4 > n/a - n/a

Mushrooms are rich in ergosterol and ergosta‐5,7‐dienol, which can be partly converted into vitamin D₂ and D₄ through ultraviolet (UV) light exposure. Typically, mushrooms have very low vitamin D contents, but it can be increased by UV irradiation. This process generates additional photoisomers scarcely studied in mushrooms due to analytical challenges. Here, we developed a new solid phase extraction...

article

Oznaczanie 1,2-dihydroksybenzenu w powietrzu na stanowiskach pracy metodą chromatografii gazowej z detekcją płomieniowo-jonizacyjną

Joanna Kowalska, Dorota Kondej

Podstawy i Metody Oceny Środowiska Pracy > 2024 > Nr 1 (119) > 95-109

1,2-Dihydroksybenzen (DHB) to bezbarwna substancja krystaliczna o charakterystycznym zapachu, która zmienia kolor na brązowy pod wpływem powietrza i światła. 1,2-Dihydroksybenzen stosuje się w przemyśle jako przeciwutleniacz. Narażenie pracowników na 1,2-dihydroksybenzen może wystąpić podczas jego produkcji, przetwarzania i stosowania substancji chemicznej, przy czym główne drogi narażenia pracowników...

article

High Selectivity of A Novel Pillar[5]arene with Ester Units as a Gas Chromatographic Stationary Phase toward Aromatic Isomers

Wen Li, Mengyi Ba, Yanli Song, Yuanyuan Zhang, more

Chemistry & Biodiversity > 21 > 3 > n/a - n/a

This work reports the first example of employing ester‐functionalized pillar[5]arene (P5A‐C10‐OAc) stationary phase for gas chromatography (GC) separations. The as‐fabricated P5A‐C10‐OAc column achieved improved column efficiency of 4270 plates/m and separation performance in contrast to the P5‐C10‐Br column. The P5A‐C10‐OAc column showed good separation performance for a wide range of analytes such...

article

Molecular Docking and GC/MS‐Based Approach for Identification of Anxiolytic Alkaloids from Griffinia (Amaryllidaceae) Species in a Zebrafish Model

Elder Luis Lima Leite, Ana Sheila de Queiroz Souza, Paulo Riceli Vasconcelos Ribeiro, Rita Cássia Alves Pereira, more

Chemistry & Biodiversity > 21 > 3 > n/a - n/a

Griffinia gardneriana Ravenna, Griffinia liboniana Morren and Griffinia nocturna Ravenna (Amarillydaceae) are bulbous plants found in tropical regions of Brazil. Our work aimed to determine the alkaloid profiles of Griffinia spp. and evaluate their anxiolytic potential through in vivo and in silico assays. The plants grown in greenhouses were dried and their ground bulbs were subjected to liquid‐liquid...

article

Enantioseparation of agrochemicals by gas chromatography. Exploring columns based on cyclodextrin derivatives dissolved into polysiloxanes

Emilia Frickel Critto, Sol Giovannoni, Carlina Lancioni, Cecilia B. Castells

Journal of Separation Science > 47 > 1 > n/a - n/a

The main goal of this work is to expand the availability of chiral columns for the analysis of agrochemicals by gas chromatography. A broader offer of chiral stationary phases would allow shifting toward enantioselective analytical techniques environmentally more friendly for those compounds. We prepared seven chiral capillary columns based on derivatives of either, β‐cyclodextrin or γ‐cyclodextrins...

article

Zastosowanie chromatografii gazowej do oznaczania 1,4-dioksanu w powietrzu na stanowiskach pracy

Dorota Kondej, Agnieszka Woźnica

Podstawy i Metody Oceny Środowiska Pracy > 2024 > Nr 1 (119) > 111-125

1,4-Dioksan to lotna ciecz o słabym zapachu, która dobrze rozpuszcza się w wodzie i większości rozpuszczalników organicznych. Jako łatwopalna ciecz stwarza zagrożenie pożarowe. 1,4-Dioksan jest niestabilny w podwyższonej temperaturze i ciśnieniu i może tworzyć mieszaniny wybuchowe. Substancja jest stosowana głównie jako rozpuszczalnik w produkcji innych substancji chemicznych, jako rozpuszczalnik...

article

Olejki eteryczne otrzymywane z roślin rodzaju melaleuca : skład chemiczny i zastosowanie

Adrianna Gajos, Marietta Białoń, Piotr P. Wieczorek

Wiadomości Chemiczne > 2024 > [Z] 78, 5-6 > 467--489

The Melaleuca plant genus is included in the myrtle family and is found from the Indochina Peninsula to Tasmania. The greatest diversity of plants in this family is found mainly in Australia. Essential oils extracted from plants of the Melaleuca genus are a mixture of valuable chemicals that exhibit a broad spectrum of biological properties. Studying the chemical composition of these oils can provide...

article

2-Butanone Oxime, a Chemical of Concern in the Working Environment

Elżbieta Dobrzyńska, Joanna Kowalska

Journal of Ecological Engineering > 2024 > Vol. 25, nr 1 > 236--244

Employers of the companies where carcinogenic chemicals are being processed or used are obliged to ensure safe working conditions for their employees. Butan-2-one oxime, commonly present in alkyd paints or silicone sealants may pose such a risk due to its reclassification as a category 1B carcinogen. Therefore, in Poland new maximum admissible concentrations (MAC) value of 1 mg/m³ was proposed by...

article

Mound architecture and season affect concentrations of CO₂, CH₄ and N₂O in nests of African fungus‐growing termites

Risto Vesala, Matti Räsänen, Sonja Leitner, Daniel Girma Mulat, more

Ecological Entomology > 48 > 6 > 725 - 737

Termites are a significant natural source of greenhouse gases (GHGs), but quantifying emissions especially from large termite mounds is problematic as they rarely fit in measurement chambers. Predicting fluxes based on internal and atmospheric concentrations could provide an indirect way to assess mound emissions, but developing such models necessitates better understanding of the concentration levels...

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GAS CHROMATOGRAPHY (4,898)
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ESSENTIAL OIL (31)
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Search results

Higher acclimation temperature modulates the composition of muscle fatty acid of Tor putitora juveniles

A chemometrics as a powerful tool in the elucidation of the role of metals in the biosynthesis of volatile organic compounds in Hungarian thyme samples

Sex differences in nicotine levels following repeated intravenous injection in rats are attenuated by gonadectomy

The analysis of e‐liquids: A study on chemical diversity and metal content using gas chromatography‐mass spectrometry and inductively coupled plasma‐mass spectrometry

Generalized flow calculation of the gas flow in a network of capillaries used in gas chromatography

Eryngial: An α,β‐Unsaturated Fatty Aldehyde as the Major Phytotoxin in Spiny Coriander (Eryngium foetidum L.) Essential Oil

Effects of molecular interactions on the release of small molecules from silicone rubber

Development of an online hydrogen fuel quality analyzer with gas chromatography‐pulsed discharge helium ionization detector for applying hydrogen infrastructures

A closer look at high‐energy X‐ray‐induced bubble formation during soft tissue imaging

Impact of post‐harvest drying on the volatile flavours of spiny coriander (Eryngium foetidum L.): Emphasis on fatty aldehyde reduction

What is the role of current mass spectrometry in pharmaceutical analysis?

Previtamin D₂, vitamin D₂, and vitamin D₄ amounts in different mushroom species irradiated with ultraviolet (UV) light and occurrence of structurally related photoproducts

Oznaczanie 1,2-dihydroksybenzenu w powietrzu na stanowiskach pracy metodą chromatografii gazowej z detekcją płomieniowo-jonizacyjną

High Selectivity of A Novel Pillar[5]arene with Ester Units as a Gas Chromatographic Stationary Phase toward Aromatic Isomers

Molecular Docking and GC/MS‐Based Approach for Identification of Anxiolytic Alkaloids from Griffinia (Amaryllidaceae) Species in a Zebrafish Model

Enantioseparation of agrochemicals by gas chromatography. Exploring columns based on cyclodextrin derivatives dissolved into polysiloxanes

Zastosowanie chromatografii gazowej do oznaczania 1,4-dioksanu w powietrzu na stanowiskach pracy

Olejki eteryczne otrzymywane z roślin rodzaju melaleuca : skład chemiczny i zastosowanie

2-Butanone Oxime, a Chemical of Concern in the Working Environment

Mound architecture and season affect concentrations of CO₂, CH₄ and N₂O in nests of African fungus‐growing termites

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