792 results match your criteria gas chromatograph-mass

Emission characteristics of PM and components of condensable particulate matter from coal-fired industrial plants.

Sci Total Environ 2021 Jul 1;796:148782. Epub 2021 Jul 1.

State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address:

Particulate matter (PM), including condensable particulate matter (CPM) and filterable particulate matter (FPM), emitted from coal combustion is one of the major contributors to air pollution. In this study, CPM and FPM were sampled from two coal-fired industrial boilers with air pollution control devices (APCDs). The emission concentration of total PM (CPM and FPM) and inorganic components of CPM were studied. Read More

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Solid-phase microextraction (SPME) for determination of geosmin and 2-methylisoborneol in volatile emissions from soil disturbance.

Chemosphere 2021 Jun 26;284:131333. Epub 2021 Jun 26.

U.S. Army Construction Engineering Research Laboratory, Champaign, IL, USA. Electronic address:

A method is described here for the concentration and determination of geosmin and 2-methylisoborneol (2-MIB) from the gaseous phase, with translation to field collection and quantification from soil disturbances in situ. The method is based on the use of solid-phase microextraction (SPME) fibers for adsorption of volatile chemicals from the vapor phase, followed by desorption into a gas chromatograph-mass spectrometer (GC-MS) for analysis. The use of a SPME fiber allows simple introduction to the GC-MS without further sample preparation. Read More

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[Simultaneous determination of four opioids in urine by solid-phase extraction and derivatization coupled with gas chromatography-mass spectrometry].

Se Pu 2020 Nov;38(11):1348-1354

Huangshi Public Security Bureau, Huangshi 435000, China.

Police officers currently use the colloidal gold rapid testing method to detect heroin in the urine of drug abusers, but the results are often rendered erroneous due to the presence of antitussive drugs, which contain opioids. The traditional manual liquid-liquid extraction method for urine testing has low efficiency and poor sensitivity, and hence, it fails to meet the requirements of the public security department to crack down on drug abusers. Therefore, to avoid punishment, most rapid-test-positive people make false claims about intaking cough suppressants. Read More

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November 2020

Data on the sulfur-containing polycyclic aromatic compounds of high-sulfur coal of SW China.

Data Brief 2021 Aug 11;37:107218. Epub 2021 Jun 11.

College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, People's Republic of China.

The data presented in this article are related to the research paper entitled "Origin and geological implications of super high sulfur-containing polycyclic aromatic compounds in high-sulfur coal" by Zhao et al. [1]. The collected data of high-sulfur coal, including the coalfield, geological age, coal rank, sulfur content, and depositional environment were from all over the world. Read More

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Degradation of TBBPA by nZVI activated persulfate in soil systems.

Chemosphere 2021 Jun 13;284:131166. Epub 2021 Jun 13.

College of Water Sciences, Beijing Normal University, Beijing, 100875, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Technical Center for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment of the People's Republic China, Beijing, 100012, China. Electronic address:

Tetrabromobisphenol A (TBBPA) greatly impacts on ecosystems and human health due to its high environmental toxicity and persistence. Persulfate (PS) advanced oxidation technology to remove organic pollutants in soils has received intense attention. In this study, nanoscale zero-valent iron (nZVI) was synthesized through the borohydride reduction method to explore its activating potential towards PS to accelerate the degradation of TBBPA in soils. Read More

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Comparison of sensitivity to a commercial essential oil between extended-spectrum β-lactamases (ESBL-) and non-ESBL-producing isolates.

Nat Prod Res 2021 Jun 14:1-6. Epub 2021 Jun 14.

Research Laboratory 'Health and Animal Productions', Higher National Veterinary School, Algiers, Algeria.

This study aimed to evaluate the antibacterial effect of essential oil (OVEO) against ESBL- and non-ESBL-producing multidrug-resistant (MDR) isolates. OVEO composition was determined using Gas chromatograph-mass spectrometer (GC/MS). In the current study, the effect of OVEO was studied on seven MDR isolates. Read More

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Profiling of Volatile Compounds and Associated Gene Expression in Two Cultivars and Their F1 Hybrid Progenies.

Molecules 2021 May 13;26(10). Epub 2021 May 13.

Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.

is an important ornamental crop in the world market and its floral scent can enhance its ornamental value. To date, studies of the components and formation mechanism of the floral scent of are relatively few. In this study, the scent profiles of two varieties were measured by gas chromatograph-mass spectrometer (GC-MS). Read More

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Biomarker identification and pathway analysis of rheumatoid arthritis based on metabolomics in combination with ingenuity pathway analysis.

Proteomics 2021 Jun 31;21(11-12):e2100037. Epub 2021 May 31.

International Institute for Translational Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, 510006, PR China.

Rheumatoid arthritis (RA) is a common autoimmune and inflammatory disease worldwide, but understanding its pathogenesis is still limited. In this study, plasma untargeted metabolomics of a discovery cohort and targeted analysis of a verification cohort were performed by gas chromatograph mass spectrometry (GC/MS). Univariate and multivariate statistical analysis were utilized to reveal differential metabolites, followed by the construction of biomarker panel through random forest (RF) algorithm. Read More

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Profiling of volatile compounds in Japanese sake stored in sherry casks using solid phase microextraction/gas chromatography/mass spectrometry analysis.

J Biosci Bioeng 2021 Jul 1;132(1):108-112. Epub 2021 May 1.

Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Osaka University Shimadzu Analytical Innovation Research Laboratory, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Institute for Open and Transdisciplinary Research Initiatives, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. Electronic address:

The combination of solid phase microextraction (SPME) and gas chromatograph-mass spectrometer (GC-MS) is frequently used for comprehensive analysis of aroma components in foods because it can be used to easily analyze volatile components, allowing saving of the amount of solvent used. In this study, SPME-GC-MS analysis of sake samples before and after sherry cask storage was performed to investigate the special flavor derived from sherry cask storage. A GC column with polyethylene glycol as the stationary phase, which is the first choice for volatile component analysis, was used. Read More

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Seasonal and temporal variations of ambient aerosols in a deciduous broadleaf forest from northern Japan: Contributions of biomass burning and biological particles.

Chemosphere 2021 Sep 8;279:130540. Epub 2021 Apr 8.

Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan; Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan. Electronic address:

Total suspended particulate (TSP) samples were collected in a deciduous broadleaf forest in Sapporo, Hokkaido, Japan, from January to December 2010 to understand the molecular composition and abundance of sugar compounds (SCs) in atmospheric aerosols. We analyzed the samples for anhydrosugars, primary sugars, and sugar alcohols using a gas chromatograph-mass spectrometer. The annual mean concentrations of total SCs ranged from 16. Read More

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September 2021

Transcriptomic analysis of α-linolenic acid content and biosynthesis in Paeonia ostii fruits and seeds.

BMC Genomics 2021 Apr 23;22(1):297. Epub 2021 Apr 23.

Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Plant Science Research Center, Chinese Academy of Sciences, Shanghai Chenshan Botanical Garden, Shanghai, 201602, China.

Background: Paeonia ostii is a potentially important oilseed crop because its seed yield is high, and the seeds are rich in α-linolenic acid (ALA). However, the molecular mechanisms underlying ALA biosynthesis during seed kernel, seed testa, and fruit pericarp development in this plant are unclear. We used transcriptome data to address this knowledge gap. Read More

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Investigating the effects of bark extract and volatile oil of against cisplatin-induced genotoxicity on HUVECs cell line.

Toxicol Res (Camb) 2021 Mar 23;10(2):223-231. Epub 2021 Mar 23.

Department of Pharmacology, Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran.

Cisplatin is used for treating multiple types of cancers. Alongside its therapeutic effects, there are side effects, including cytotoxicity and genotoxicity for healthy cells, which are mainly related to radical oxygen species (ROS) production by the drug. These side effects could troublesome the treatment process. Read More

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Levels of polybrominated diphenyl ethers (PBDEs) in water and sediment from open city drains in Makurdi Metropolitan Area, North Central Nigeria.

Environ Monit Assess 2021 Apr 5;193(5):244. Epub 2021 Apr 5.

Department of Chemistry, Federal University of Agriculture Makurdi, PMB 2373, Benue State, Makurdi, Nigeria.

Polybrominated diphenyl ethers (PBDEs) have been classified as persistent organic pollutants (POPs) as well as endocrine-disrupting compounds (EDCs). This study determined the concentrations of six PBDE congeners (BDE 47, BDE 99, BDE 100, BDE 153, BDE 154, and BDE 183) in water and sediment samples from open city drains, in the Makurdi Metropolitan Area, North Central Nigeria, using gas chromatogragh-mass spectrometer. These congeners are components of the penta- and octa-BDE formulations that have been banned by the European Union. Read More

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Biophysical analysis of the plant-specific GIPC sphingolipids reveals multiple modes of membrane regulation.

J Biol Chem 2021 Jan-Jun;296:100602. Epub 2021 Mar 27.

Laboratoire de Biogènese Membranaire, UMR 5200, CNRS, Université de Bordeaux, Villenave d'Ornon Cedex, France. Electronic address:

The plant plasma membrane (PM) is an essential barrier between the cell and the external environment, controlling signal perception and transmission. It consists of an asymmetrical lipid bilayer made up of three different lipid classes: sphingolipids, sterols, and phospholipids. The glycosyl inositol phosphoryl ceramides (GIPCs), representing up to 40% of total sphingolipids, are assumed to be almost exclusively in the outer leaflet of the PM. Read More

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Biochemical pathways and associated microbial process of di-2-ethyl hexyl phthalate (DEHP) enhanced degradation by the immobilization technique in sequencing batch reactor.

Environ Technol 2021 Apr 11:1-10. Epub 2021 Apr 11.

College of Civil Engineering, Sichuan Agricultural University, Dujiangyan, People's Republic of China.

A bacterial strain ASLT-13 was successfully isolated from activated sludge and identified as . Gas chromatograph-mass spectrometer (GC-MS) analysis indicated that strain ASLT-13 could completely mineralize di 2-ethyl hexyl phthalate (DEHP). DEHP was first metabolized from the longer side chain of the benzene ring into shorter branches (Phatlalic mono-esters) like Dibutyl phthalate (DBP) under the action of degrading genes. Read More

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Analysis and formation of polycyclic aromatic hydrocarbons and cholesterol oxidation products in thin slices of dried pork during processing.

Food Chem 2021 Aug 7;353:129474. Epub 2021 Mar 7.

Department of Food Science, Fu Jen Catholic University, New Taipei City 242, Taiwan; Department of Nutrition, China Medical University, Taichung 404, Taiwan. Electronic address:

This study aims to determine toxic compounds polycyclic aromatic hydrocarbons (PAHs) and cholesterol oxidation products (COPs) in thin slices of dried pork as affected by different flavorings and roasting temperature treatments through employing a QuEChERS method coupled with gas chromatograph-tandem mass spectrometer (GC-MS/MS) and gas chromatograph-mass spectrometer (GC-MS), respectively. By employing this method, high accuracy and precision was attained for freeze-dried pork hind leg sample. Following addition of 8 different flavorings with roasting temperature at 120, 160, and 200 °C, the levels of total COPs and PAHs in thin slices of dried pork followed a temperature-dependent increase during roasting, which was further confirmed by principle component analysis. Read More

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Metabolite profiling of chondrosarcoma cells: A robust GC-MS method for the analysis of endogenous metabolome.

J Chromatogr B Analyt Technol Biomed Life Sci 2021 Apr 27;1169:122606. Epub 2021 Feb 27.

School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China.

Chondrosarcoma is the 2nd most frequent bone sarcoma. In this study, the metabolic profiling of human chondrosarcoma SW-1353 cell line was investigated for the first time. To obtain more precise information about the metabolites from chondrosarcoma cells, pretreatment methods including washing steps/solvents, harvesting conditions, and extraction protocols for chondrosarcoma SW-1353 cells were evaluated in the context of metabolite profiling by GC-MS technique. Read More

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Influence of yeast inoculation on the quality of fermented coffee (Coffea arabica var. Mundo Novo) processed by natural and pulped natural processes.

Int J Food Microbiol 2021 Apr 18;343:109107. Epub 2021 Feb 18.

Biology Department, Federal University of Lavras, CEP 37200-000 Lavras, MG, Brazil. Electronic address:

Starter cultures during fermentation of Coffea arabica var. Mundo Novo processed in open stainless-steel vessels by natural and pulped natural methods were studied. The yeasts Meyerozyma caribbica (CCMA 0198), Saccharomyces cerevisiae (CCMA 0543), Candida parapsilosis (CCMA 0544), and Torulaspora delbrueckii (CCMA 0684) were inoculated separately in two different coffee processes: natural and pulped natural. Read More

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Effect of chitosan and gum Arabic with natamycin on the aroma profile and bacterial community of Australian grown black Périgord truffles (Tuber melansoporum) during storage.

Food Microbiol 2021 Aug 21;97:103743. Epub 2021 Jan 21.

School of Molecular Life Sciences, Curtin University, Kent Street, Bentley, Western Australia, Australia. Electronic address:

This study aimed to assess the effect of chitosan or gum Arabic edible coatings, with natamycin (200, 300, 400 mg/L) on the aroma profiles of Western Australian grown truffles at five storage intervals: 0, 7, 14, 21, and 28 days using solid-phase microextraction (SPME)-followed by gas chromatography-mass spectrometry (GC-MS). The population structure of the bacterial community of both untreated and chitosan-natamycin (400 mg/L) coated truffles were assessed using metagenomic sequencing analysis alongside GC-MS. The results demonstrated that all the coating treatments were able to have a positive impact in halting or delaying the changes of truffle aroma throughout the storage period, with chitosan-natamycin (400 mg/L) coating having the best preservation results compared to the other coatings. Read More

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Structure analysis of a non-esterified homogalacturonan isolated from Portulaca oleracea L. and its adjuvant effect in OVA-immunized mice.

Int J Biol Macromol 2021 Apr 22;177:422-429. Epub 2021 Feb 22.

School of Life Sciences, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China. Electronic address:

We isolated and purified a pectin from Portulaca oleracea L. (P. oleracea), and analysed its structure by high-performance size exclusion chromatography (HPSEC), high-performance liquid chromatography (HPLC), gas chromatograph-mass spectrometer (GC-MS), fourier transform infrared spectroscopy (FT-IR), and H, C nuclear magnetic resonance spectroscopy (NMR). Read More

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[Screening of different metabolites in teenage football players after exercise fatigue].

Zhongguo Ying Yong Sheng Li Xue Za Zhi 2020 Sep;36(5):465-470

School of Sports, Shaanxi Normal University, Xi'an 710062, China.

To investigate the changes of metabolites of teenage football players after exercise-induced fatigue. Twelve male teenage football players (14~16 yrs) were selected as experimental subjects in this study. And an exercise model including aerobic and anaerobic exercise as one group exercise was established by using power bicycle: completion 6 min 150 W load, 60~65 r/min of riding exercise and 30 s of riding exercise which load was the maximum speed set by the tester's weight. Read More

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September 2020

Sample preparation and instrumental methods for illicit drugs in environmental and biological samples: A review.

J Chromatogr A 2021 Mar 2;1640:461961. Epub 2021 Feb 2.

KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Guangdong Institute of Analysis (China National Analytical Center Guangzhou), Guangzhou, 510070, China; Chemistry College, Center of Advanced Analysis and Gene Sequencing, Zhengzhou University, Kexue Avenue 100, Zhengzhou 450001, China. Electronic address:

Detection of illicit drugs in the environmental samples has been challenged as the consumption increases globally. Current review examines the recent developments and applications of sample preparation techniques for illicit drugs in solid, liquid, and gas samples. For solid samples, traditional sample preparation methods such as liquid-phase extraction, solid-phase extraction, and the ones with external energy including microwave-assisted, ultrasonic-assisted, and pressurized liquid extraction were commonly used. Read More

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Bay Leaf ( L.) Incense Improved Scopolamine-Induced Amnesic Rats by Restoring Cholinergic Dysfunction and Brain Antioxidant Status.

Antioxidants (Basel) 2021 Feb 8;10(2). Epub 2021 Feb 8.

Department of Biology, Faculty of Biology, Alexandru Ioan Cuza University of Iasi, 700506 Iasi, Romania.

Bay leaf ( L.) has been shown to possesses various biological activities such as wound healing activity, antioxidant activity, antibacterial activity, antiviral activity, immunostimulant activity, anticholinergic activity, antifungal activity, insect repellant activity, anticonvulsant activity, antimutagenic activity, and analgesic and anti-inflammatory activity. The present study aimed to investigate whether the bay leaf incense (BL) elicits the memory formation via the action on the cholinergic system using a scopolamine (Sco)-induced rat model. Read More

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February 2021

GC-MS Based Identification of the Volatile Components of Six Species from Uzbekistan and Their Biological Activity.

Plants (Basel) 2021 Jan 8;10(1). Epub 2021 Jan 8.

Department of Pharmacognosy, Faculty of Pharmacy, Ain Shams University, 11566 Cairo 11566, Egypt.

The compositions of volatile components in the aerial parts of six species, namely (), (), (), (), () and (), were investigated using gas chromatograph-mass spectrometry (GC-MS) analysis. Ninety-seven metabolites were identified, accounting for 73.28, 87. Read More

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January 2021

Development of Analytical Methods and Nutritional Studies Using Synthetic Fatty Acids and Triacylglycerols.

J Oleo Sci 2021 ;70(1):1-9

Faculty of Food and Agricultural Sciences, Fukushima University.

The metabolism of fatty acids or triacylglycerol (TAG) is affected by their molecular structures. Several methods to separate and quantify TAG isomers in natural fats and oils were developed. For instance, an analytical method of TAG molecular species using a gas chromatograph-flame ionization detector and the analytical method to separate and quantify TAG positional isomers and enantiomers using a high performance liquid chromatograph-mass spectrometer were established. Read More

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Patterns of Caffeine Use and Validation of Assessment in Psychiatric Population: An Implication in Primary Care Setting.

J Family Med Prim Care 2020 Oct 30;9(10):5252-5255. Epub 2020 Oct 30.

Centre for Addiction Medicine, Department of Psychiatry, National Institute of Mental Health and Neurosciences, Bangalore, India.

Background: Caffeine use and abuse is a concern among treatment seekers for psychological problems. This aspect has not been documented an Indian context as well as its relevance in primary care setting. The aim of the present study was to explore and compare the caffeine intake and prevalence in Indian psychiatric patients and healthy subjects. Read More

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October 2020

Low circulating dihomo-gamma-linolenic acid is associated with diabetic retinopathy: a cross sectional study of KAMOGAWA-DM cohort study.

Endocr J 2021 Apr 22;68(4):421-428. Epub 2020 Dec 22.

Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan.

Diabetic retinopathy (DR), one of the major complications of diabetes, can cause blindness and reduce quality of life. Dyslipidemia is reported to be associated with DR, whereas arachidonic acid may have a protective effect against DR. We aimed to investigate the association of circulating n-3 and n-6 polyunsaturated fatty acids (PUFAs) with DR. Read More

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Improving Quantification of tabun, sarin, soman, cyclosarin, and sulfur mustard by focusing agents: A field portable gas chromatography-mass spectrometry study.

J Chromatogr A 2021 Jan 13;1636:461784. Epub 2020 Dec 13.

Hazardous Materials Research Center (HMRC), Battelle Columbus Laboratories, Battelle Memorial Institute, Columbus, OH, USA.

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; however most analyses relies on self-contained or external calibration that inherently drifts over time. We describe an analytical approach that uses target-based thermal desorption standards, called focusing agents, to accurately calculate concentrations of chemical warfare agents that are analyzed by gas chromatograph-mass spectrometry. Here, we provide relative response factors of focusing agents (2-chloroethyl ethyl sulfide, diisopropyl fluorophosphate, diethyl methylphosphonate, diethyl malonate, methyl salicylate, and dichlorvos) that are used to quantify concentrations of tabun, sarin, soman, cyclosarin and sulfur mustard loaded on thermal desorption tubes (Tenax® TA). Read More

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January 2021

Polymerization Mechanism of Nitrogen-Containing Heteroaromatic Compound Under High-Pressure and High-Temperature Conditions.

J Phys Chem A 2021 Jan 27;125(1):376-386. Epub 2020 Dec 27.

Earth and Planets Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, United States.

Hydrogenated carbon nitride is synthesized by polymerization of 1,5-naphthyridine, a nitrogen-containing heteroaromatic compound, under high-pressure and high-temperature conditions. The polymerization progressed significantly at temperatures above 573 K at 0.5 GPa and above 623 K at 1. Read More

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January 2021

Determination of organochlorine pesticides in human umbilical cord and association with orofacial clefts in offspring.

Chemosphere 2021 Mar 3;266:129188. Epub 2020 Dec 3.

Institute of Reproductive and Child Health, National Health Commission Key Laboratory of Reproductive Health, Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.

Studies based on questionnaires suggested that maternal exposure to pesticides increases the risk for orofacial clefts (OFCs). However, whether organochlorine pesticides (OCPs) exposure in vivo affects the occurrence of OFCs remains unclear. The aims of this study are to investigate the association of OCP exposure with the risk of OFCs by examining the concentrations of OCPs in human umbilical cords, and investigate the potential dietary sources of OCPs in umbilical cord tissues. Read More

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