keyword
MENU ▼
Read by QxMD icon Read
search

GC MS analysis

keyword
https://www.readbyqxmd.com/read/27914543/extract-of-syringa-oblata-a-new-biocontrol-agent-against-tobacco-bacterial-wilt-caused-by-ralstonia-solanacearum
#1
Wanming Bai, Fanyu Kong, Yong Lin, Chengsheng Zhang
Ralstonia solanacearum causes serious wilt disease in tobacco. To effectively control this disease, the antibacterial activity of 95% ethanol extracts from the flower buds of Syringa oblata was examined. Based on GC-MS analysis and an inhibition experiment against R. solanacearum, the main antibacterial component is eugenol. We further determined the effect of eugenol on the physiology, biochemistry, and cellular morphology of R. solanacearum. The results showed that eugenol can destroy wilt bacteria, leading to the disappearance of flagella, the leakage of contents, and the appearance of a cavity...
November 2016: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/27913395/metabolomic-characterization-of-hepatocellular-carcinoma-in-patients-with-liver-cirrhosis-for-biomarker-discovery
#2
Cristina Di Poto, Alessia Ferrarini, Yi Zhao, Rency S Varghese, Chao Tu, Yiming Zuo, Minkun Wang, Mohammad R Nezami Ranjbar, Yue Luo, Chi Zhang, Chirag S Desai, Kirti Shetty, Mahlet G Tadesse, Habtom W Ressom
BACKGROUND: Metabolomics plays an important role in providing insight into the etiology and mechanisms of hepatocellular carcinoma (HCC). This is accomplished by a comprehensive analysis of patterns involved in metabolic alterations in human specimens. This study compares the levels of plasma metabolites in HCC cases versus cirrhotic patients and evaluates the ability of candidate metabolites in distinguishing the two groups. Also, it investigates the combined use of metabolites and clinical covariates for detection of HCC in patients with liver cirrhosis...
December 2, 2016: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/27912966/structure-related-related-new-approach-in-the-gc-ms-analysis-of-cathinone-type-synthetic-drugs
#3
Borbála Molnár, Blanka Fodor, Antal Csámpai, Előd Hidvégi, Ibolya Molnár-Perl
A novel, structure-related derivatization principle has been developed in order to quantify cathinone-type synthetic drugs (CTSDs), focusing on the most common pentedrone (PENT), including also 4-fluoromethcathinone (4-FMC), methcathinone (MCTN), 4-methylethcathinone (4-MEC), 3,4-dimethylmethcathinone (3,4-DMMC), and 4-ethylmethcathinone (4-EMC). Firstly, oximated and, secondly, trimethylsilylated CTSD derivatives were characterized by mass fragmentation patterns using GC/MS that led to the development of a harmonized, quantitative, two-steps derivatization methodology...
November 22, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27904751/association-of-serum-concentrations-of-persistent-organic-pollutants-pops-and-risk-of-pre-eclampsia-a-case-control-study
#4
Bita Eslami, Hossein Malekafzali, Noushin Rastkari, Batool Hossein Rashidi, Abolghasem Djazayeri, Kazem Naddafi
BACKGROUND: There is increasing evidence that persistent organic pollutants (POPs) may contribute to pre-eclampsia. The objective of this study was to evaluate the association between Polychlorinated Biphenyls (PCBs) and Polybrominated Diphenyl Ethers (PBDEs) as POPs with pre-eclampsia. METHODS: This case-control study was performed in the three general university hospitals of Tehran University of Medical Sciences. Serum samples were collected from cases (n = 45) who had diagnosed with preeclampsia and from control samples (n = 70) with normal pregnancy and attended the same hospital for a routine prenatal visit at the third trimester of pregnancy...
2016: Journal of Environmental Health Science & Engineering
https://www.readbyqxmd.com/read/27904455/profiling-of-disease-related-metabolites-in-grapevine-internode-tissues-infected-with-agrobacterium-vitis
#5
Sung-Min Jung, Youn-Young Hur, John E Preece, Oliver Fiehn, Young-Ho Kim
Green shoot cuttings of 10 different grapevine species were inoculated with Agrobacterium vitis to find disease-related metabolites in the grapevine. Crown galls formed 60 days after inoculation varied in gall severity (GS) evaluated by gall incidence (GI) and gall diameter (GD), which were classified into three response types as RR (low GI and small GD), SR (high GI and small GD), and SS (high GI and large GD), corresponding to resistant, moderately resistant, and susceptible responses, respectively. In this, 4, 4, and 2 Vitis species were classified into RR, SR, and SS, respectively...
December 2016: Plant Pathology Journal
https://www.readbyqxmd.com/read/27900358/structural-and-antitrypanosomal-data-of-different-carbasones-of-piperitone
#6
Amoussatou Sakirigui, Fernand Gbaguidi, Urbain C Kasséhin, Jacques Poupaert, Georges C Accrombessi, Simeon O Kotchoni
This article reports data on four carbazones of piperitone: semicarbazone 1, thiosemicarbazone 2, 4-phenyl semicarbazone 3 and 4-phenyl thiosemicarbazone 4 prepared directly in situ from essential oil of Cymbopogon schoenantus, whose GC-FID and GC-MS analysis revealed piperitone as major component (68.20%). The structures of hemi-synthesized compounds were confirmed by high throughput IR, MS, (1)H and (13)C NMR based spectrometric analysis. Their antiparasitic activities were evaluated in vitro on Trypanosoma brucei brucei (Tbb)...
December 2016: Data in Brief
https://www.readbyqxmd.com/read/27899920/impacts-of-fertilization-regimes-on-arbuscular-mycorrhizal-fungal-amf-community-composition-were-correlated-with-organic-matter-composition-in-maize-rhizosphere-soil
#7
Chen Zhu, Ning Ling, Junjie Guo, Min Wang, Shiwei Guo, Qirong Shen
The understanding of the response of arbuscular mycorrhizal fungi (AMF) community composition to fertilization is of great significance in sustainable agriculture. However, how fertilization influences AMF diversity and composition is not well-established yet. A field experiment located in northeast China in typical black soil (Chernozem) was conducted and high-throughput sequencing approach was used to investigate the effects of different fertilizations on the variation of AMF community in the rhizosphere soil of maize crop...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27898320/catalytic-pyrolysis-of-natural-algae-over-mg-al-layered-double-oxides-zsm-5-mgal-ldo-zsm-5-for-producing-bio-oil-with-low-nitrogen-content
#8
Lijing Gao, Jiahui Sun, Wei Xu, Guomin Xiao
Cyanobacteria were catalytically pyrolyzed over Mg-Al layered double oxide/ZSM-5 composites (MgAl-LDO/ZSM-5) to produce bio-oil. MgAl-LDO/ZSM-5 with a Mg/Al molar ratio of four was proved to be the best catalyst. Under the optima condition that the final temperature was 823K, heating rate was 10K/min and catalyst/algae mass ratio was 0.75, a maximum yield of liquid (41.1%) was achieved at 823K with a heating rate of 10K/min and a catalyst/algae mass ratio of 0.75, which was much higher than the one obtained without catalyst...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27896554/emission-of-volatile-compounds-from-apple-plants-infested-with-pandemis-heparana-larvae-antennal-response-of-conspecific-adults-and-preliminary-field-trial
#9
Valentino Giacomuzzi, Luca Cappellin, Iuliia Khomenko, Franco Biasioli, Stefan Schütz, Marco Tasin, Alan L Knight, Sergio Angeli
This study investigated the volatile emission from apple (Malus x domestica Borkh., cv. Golden Delicious) foliage that was either intact, mechanically-damaged, or exposed to larval feeding by Pandemis heparana (Denis and Schiffermüller) (Lepidoptera: Tortricidae). Volatiles were collected by closed-loop-stripping-analysis and characterized by gas chromatography-mass spectrometry in three time periods: after 1 h and again 24 and 48 h later. Volatiles for all treatments also were monitored continuously over a 72-h period by the use of proton transfer reaction - time of flight-mass spectrometry (PTR-ToF-MS)...
November 28, 2016: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/27896547/chemical-analysis-of-a-miller-type-complex-prebiotic-broth-part-ii-gas-oil-water-and-the-oil-water-interface
#10
Sabrina Scherer, Eva Wollrab, Luca Codutti, Teresa Carlomagno, Stefan Gomes da Costa, Andreas Volkmer, Amela Bronja, Oliver J Schmitz, Albrecht Ott
We have analyzed the chemical variety obtained by Miller-Urey-type experiments using nuclear magnetic resonance (NMR) spectroscopy and coherent anti-Stokes Raman scattering (CARS) spectroscopy, gas chromatography followed by mass spectrometry (GC/MS) and two-dimensional gas chromatography followed by mass spectrometry (GCxGC/MS). In the course of a running Miller-Urey-type experiment, a hydrophobic organic layer emerged besides the hydrophilic aqueous phase and the gaseous phase that were initially present...
November 28, 2016: Origins of Life and Evolution of the Biosphere
https://www.readbyqxmd.com/read/27896384/uptake-of-total-petroleum-hydrocarbon-tph-and-polycyclic-aromatic-hydrocarbons-pahs-by-oryza-sativa-l-grown-in-soil-contaminated-with-crude-oil
#11
Rupshikha Patowary, Kaustuvmani Patowary, Arundhuti Devi, Mohan Chandra Kalita, Suresh Deka
The purpose of this study was to determine whether total petroleum hydrocarbon (TPH) and polycyclic aromatic hydrocarbons (PAHs) present in crude oil contaminated sites are transferred to roots, shoots and finally the grains of rice crops (Oryza sativa L.) grown in those sites. Soil was artificially contaminated with crude oil at concentrations of 0, 1000, 5000, 10,000, and 15,000 mg/kg, followed by planting of rice seedlings. After harvest, TPH in plant samples were measured, and it was determined that the uptake of TPH by the plants gradually increased as the concentration of oil in soil increased...
November 28, 2016: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27894695/the-performance-of-atmospheric-pressure-gas-chromatography-tandem-mass-spectrometry-compared-to-gas-chromatography-high-resolution-mass-spectrometry-for-the-analysis-of-polychlorinated-dioxins-and-pcbs-in-food-and-feed-samples
#12
Guillaume Ten Dam, Igor Cabreira Pussente, Georges Scholl, Gauthier Eppe, Alexander Schaechtele, Stefan van Leeuwen
Recently, gas chromatography tandem mass spectrometry (GC-MS/MS) has been added in European Union (EU) legislation as an alternative to magnetic sector high resolution mass spectrometry (HRMS) for the analysis of dioxins and dioxin like polychlorinated biphenyls (dl-PCB) in food and feed. In this study the performance of APGC-MS/MS compared to GC-HRMS is investigated and compared with EU legislation. The study includes the legislative parameters, relative intermediate precision standard deviation (SRw,rel), trueness, sensitivity, linear range and ion ratio tolerance...
November 22, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27893829/sansevieria-roxburghiana-schult-schult-f-family-asparagaceae-attenuates-type-2-diabetes-and-its-associated-cardiomyopathy
#13
Niloy Bhattacharjee, Ritu Khanra, Tarun K Dua, Susmita Das, Bratati De, M Zia-Ul-Haq, Vincenzo De Feo, Saikat Dewanjee
BACKGROUND: Sansevieria roxburghiana Schult. & Schult. F. (Family: Asparagaceae) rhizome has been claimed to possess antidiabetic activity in the ethno-medicinal literature in India. Therefore, present experiments were carried out to explore the protective role of edible (aqueous) extract of S. roxburghiana rhizome (SR) against experimentally induced type 2 diabetes mellitus (T2DM) and its associated cardiomyopathy in Wistar rats. METHODS: SR was chemically characterized by GC-MS analysis...
2016: PloS One
https://www.readbyqxmd.com/read/27892828/qualitative-and-quantitative-analysis-of-monomers-in-polyesters-for-food-contact-materials
#14
Fabrian Brenz, Linke Susanne, Simat Thomas
Polyesters (PES) are gaining more importance on the food contact material (FCM) market and the variety of properties and applications is expected to be wide. In order to acquire the desired properties manufacturers can combine several FCM approved polyvalent carboxylic acids (PCA) and polyols as monomers. However, information about the qualitative and quantitative composition of FCM articles is often limited. The method presented here describes analysis of PES with the identification and quantification of 25 polyester monomers (10 PCA, 15 polyols) by HPLC with diode array detection (HPLC-DAD) and GC-MS after alkaline hydrolysis...
November 28, 2016: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/27892539/chemotypic-variation-in-terpenes-emitted-from-storage-pools-influences-early-aphid-colonisation-on-tansy
#15
Mary V Clancy, Sharon E Zytynska, Matthias Senft, Wolfgang W Weisser, Jörg-Peter Schnitzler
Tansy plants (Tanacetum vulgare L.) exhibit high chemical variation, particularly in mono- and sesquiterpenes that are stored in specialised glands on the plant surface. In the present work we investigated the effects of terpene chemotypes on Metopeurum fuscoviride, an aphid species specialised on tansy, and their tending ants, at the field scale. Previous studies have chemotyped tansy by assessing dominant compounds; here we propose a method of chemotyping using all volatile compounds that are likely emitted from the storage glands...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27891187/mass-spectrometry-of-analytical-derivatives-2-ortho-and-para-effects-in-electron-ionization-mass-spectra-of-derivatives-of-hydroxy-mercapto-and-amino-benzoic-acids
#16
Nino G Todua, Anzor I Mikaia
Derivatives requiring either anhydrous or aqueous reaction conditions were prepared for robust and reliable gas chromatography/mass spectrometry (GC/MS) characterization of hydroxyl, mercapto, and amino benzoic acids Methylation and trialkylsilytation are employed for blocking the acidic function. Alkyl, trimethylsilyl, acetyl, perfluoroacyl and alkoxycarbonyl derivatization groups are introduced to hydroxyl, mercapto and amino functions. The electron ionization induced fragmentation characteristics of corresponding derivatives are explained by comparing the MS(1) spectra of unlabeled compounds to their (2)H and (13)C labeled analogs, and analysis of collision-induced dissociation data from MS(2) spectra...
2016: Mass Spektrom
https://www.readbyqxmd.com/read/27889911/multiregional-analysis-of-global-5-methylcytosine-and-5-hydroxymethylcytosine-throughout-the-progression-of-alzheimer-s-disease
#17
Elizabeth M Ellison, Erin L Abner, Mark A Lovell
Epigenetic modifications to cytosine are known to alter transcriptional states and deregulate gene expression in cancer, embryonic development, and most recently in neurodegeneration. To test the hypothesis that global levels of cytosine modification are altered throughout the progression of Alzheimer's disease, 5-methylcytosine (5-mC) and 5-hydroxmethylcytosine (5-hmC) were quantified using gas chromatography/mass spectrometry (GC/MS) and stable labeled internal standards of cytosine, 5-mC, and 5-hmC. Cytosine modifications were quantified in DNA extracted from tissue specimens of four brain regions (cerebellum, inferior parietal lobe, superior and middle temporal gyrus, and hippocampus/parahippocampal gyrus) of cognitively normal control (NC) subjects and subjects with mild cognitive impairment (MCI), preclinical Alzheimer's disease (PCAD), late onset Alzheimer's disease (LOAD), frontotemporal lobar degeneration (FTLD) and dementia with Lewy bodies (DLB)...
November 27, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27889228/cardioprotective-effect-of-vitex-negundo-on-isoproterenol-induced-myocardial-necrosis-in-wistar-rats-a-dual-approach-study
#18
E Maruthi Prasad, Ramgopal Mopuri, Md Shahidul Islam, Lakshmi Devi Kodidhela
Cardiovascular diseases (CVDs) are becoming the major cause of deaths worldwide, and their treatment demands novel therapeutic strategies. In this connection, we have identified p21 activated kinase 1 (PAK1) as a novel therapeutic target for the treatment of myocardial infarction (MI), where its expression is decreased when MI is induced with isoproterenol (ISO), which was brought back normal with pretreatment of Vitex negundo leaf ethanolic extract (VNE). These results were also supported by histopathological studies, cardiac markers, antioxidants, and inflammatory cytokines (NF-κB and IL-1β)...
November 23, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27889114/the-hidden-web-and-the-fentanyl-problem-detection-of-ocfentanil-as-an-adulterant-in-heroin
#19
Pol Quintana, Mireia Ventura, Marc Grifell, Alvaro Palma, Liliana Galindo, Iván Fornís, Cristina Gil, Xoán Carbón, Fernando Caudevilla, Magí Farré, Marta Torrens
BACKGROUND: The popularization of anonymous markets such as Silk Road is challenging current drug policy and may provide a new context for old issues, such as adulteration of heroin with fentanyl derivatives. The aims of this paper are to report the presence of ocfentanil, a novel, potent, non-controlled fentanyl analog, in samples sold as heroin in the hidden web, and to summarize the effects reported by users. METHODS: In 2015, four samples allegedly bought as heroin in cryptomarkets of the hidden web were sent to Energy Control for analysis...
November 23, 2016: International Journal on Drug Policy
https://www.readbyqxmd.com/read/27887701/more-than-170-polyunsaturated-tocopherol-related-compounds-in-a-vitamin-e-capsule-countercurrent-chromatographic-enrichment-gas-chromatography-mass-spectrometry-analysis-and-preliminary-identification-of-the-potential-artefacts
#20
Simon Hammann, Alexander Kröpfl, Walter Vetter
Tocopherols and tocotrienols (usually summed up as vitamin E) are a class of structurally related natural antioxidants. Commonly, only some of the eight classic representatives (four tocopherols and four tocotrienols) are found with varied composition in food. In this study we fractionated 230mg oil from commercial vitamin E supplement capsules by countercurrent chromatography (CCC) and subsequent analysis by gas chromatography with mass spectrometry (GC/MS) of silylated CCC fractions showed that these eight isomers represented only about 70% of total tocopherol compounds...
December 9, 2016: Journal of Chromatography. A
keyword
keyword
39979
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"