Compounds gas chromatography mass spectrometry. Medical search. Frequent questions

The ability to monitor grape aroma compounds would allow for better understanding of how vineyard practices and winemaking processes influence the final volatile composition of the wine. (unboundmedicine.com)
Here, we describe a procedure using GC-MS combined with headspace solid-phase microextraction (HS-SPME) for profiling the free volatile compounds in Cabernet Sauvignon grapes. (unboundmedicine.com)
Using this method, 27 flavor compounds were monitored and used to profile the free volatile components in Cabernet Sauvignon grapes at different maturity levels. (unboundmedicine.com)
For the analysis of volatile compounds, a purge and trap (P&T) concentrator system may be used to introduce samples. (wikipedia.org)
1980. Analysis of ambient air at New Jersey locations for selected volatile organic compounds. (cdc.gov)
1994. Concentrations of volatile organic compounds in indoor air- A review. (cdc.gov)
In this component, personal exposure to air toxics (specifically, volatile organic compounds, or VOCs) were assessed through the use of passive exposure monitors (or badges) worn by participants for a period of 48-72 hours. (cdc.gov)
Sixty unique chemical features representative of exogenous chemicals and endogenous compounds, including single-ring aromatics, polynuclear aromatic hydrocarbons, volatile sulfur-containing compounds, aldehydes, alkanes, and alkenes were identified using the nontargeted analysis workflow. (cdc.gov)
In the present study we tested in vitro the mixture of volatile organic compounds (VOCs) produced by M. yucatanensis for the allelochemical effects against phytopathogenic fungi and fungoids, other endophytic fungi, and plants. (usda.gov)
however, during manufacture, linear chains and cyclic compounds of a smaller number of DMS units produced are volatile. (spie.org)
Using headspace solid-phase microextraction followed by gas chromatography mass spectrometry, researchers identified 45 volatile compounds, including ketones and aldehydes. (ift.org)
L. rhamnosus and L. plantarum did not significantly affect the major volatile compounds, while L. casei and L. acidophilus contributed to the formation of minor volatile metabolites. (ift.org)
We have developed a technique based on cryo trapping followed by gas chromatography with mass spectrometry analysis that is more sensitive to less-volatile compounds. (nist.gov)
Using gas chromatography and mass spectrometry, plant physiologist Jim Mattheis (left) and technician David Buchanan analyze volatile apple compounds that contribute to both aroma and flavor. (usda.gov)
Malle, P., Determination of volatile compounds in whiting (Merlangius merlangus) using headspace-solid-phase microextraction-gas chromatography-mass spectrometry, J. Chromatogr. (chemspider.com)
Shibamoto, T., Volatile compounds from heated beef fat and beef fat with glycine, J. Agric. (chemspider.com)
Webb, A.D., Identification of Some Volatile Compounds of Wine of Vitis Vinifera Cultivar Pinot Noir, Am. J. Enol. (chemspider.com)
Odorous or volatile compounds released from various biological fluids are determined and identified by gas chromatography-mass spectrometry. (vetmeduni.ac.at)
Breeding of Persian melon: Purpose to increase volatile compounds in melon (Cucumis melo) intergroup F1 cross population. (mpg.de)
Acquisition of Volatile Compounds by Gas Chromatography-Mass Spectrometry (GC-MS). In: Methods in Molecular Biology, Bd. (mpg.de)
Gas chromatography mass spectrometry is also available for the analysis of volatile compounds, as well as a state-of-the-art pipetting robot for automated sample preparation. (lu.se)

Furthermore, with the most commonly used chemometrics algorithms, it is difficult to accurately extract and discriminate the huge amounts of data generated by mass spectrometry, such as ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-QTOF). (hindawi.com)
Zhang Y, Wang Q, Zhang G, Jia W, Ren Y, Wu Y. Biomarker analysis of hemoglobin adducts of acrylamide and glycidamide enantiomers for mid-term internal exposure assessment by isotope dilution ultra-high-performance liquid chromatography tandem mass spectrometry. (cdc.gov)
Two hair cleansing conditioners were subjected to temperatures of 60 °C and 185 °C to simulate the use of a blow dryer or flatiron hair straightener, respectively and analyzed via Gas Chromatography-Mass Spectrometry (GC-MS), High-Performance Liquid Chromatography-UV (HPLC) and Fourier-Transform Infrared Spectroscopy (FT-IR) to capture a chemical profile of the samples. (mdpi.com)
Over a span of 120 days, the stability of these encapsulated compounds was meticulously evaluated, encompassing assessments via different antioxidant capacity assays, phenolic content analyses, and high-performance liquid chromatography measurements. (bvsalud.org)

Trapped ion mobility spectrometry (TIMS) combined with quadrupole time of flight mass spectrometry (Q-TOF). (lu.se)

TY - JOUR T1 - Characterization of key aroma compounds in Chinese rice wine using gas chromatography-mass spectrometry and gas chromatography-olfactometry. (unboundmedicine.com)
Organic compounds present in the natural Amazonian aerosol: Characterization by gas chromatography-mass spectrometry. (mpg.de)
Initially, the intern will assist in the characterization of standard (known) organic compounds. (seti.org)
This study aimed to determine if the ethanol extract and other derivatives are effective cytotoxic agents against gastric adenocarcinoma (AGS cells) and anti-H. pylori agent, its chemical composition, and mass spectrometry characterization of the more abundant compounds. (medworm.com)
We develop and optimize analytical methods for organic and organometallic compounds, using either liquid chromatography (UHPLC) or supercritical fluid chromatography (SFC) with MS and MS/MS characterization or quantification. (lu.se)
This instrument is used for the characterization of synthesized or isolated organic and organometallic compounds. (lu.se)

The majority of VOCs were identified by gas chromatography/mass spectrometry. (usda.gov)
Almost all compounds identified in the VOCs mixture were not previously reported from other Muscodor species. (usda.gov)

Furthermore, the ESI(-) FT-ICR MS characterized the more abundant phenolic compounds, including Quinic Acid, Myricitrin, Gemin D/Hippom. (medworm.com)
This investigation delved into the efficacy of distinct wall materials-whey protein isolate, high methoxy pectin, and gum arabic-when employed individually or in combination to encapsulate and preserve phenolic compounds and antioxidants during storage. (bvsalud.org)
Different phenolic compounds were found in acerola and guava by-products during fermentation. (bvsalud.org)
J. Prothmann, S. Palmer, C. Turner, M. Sandahl, Separation of monomeric and dimeric phenolic compounds in lignosulphonate lignin on different stationary phases using ultrahigh-performance supercritical fluid chromatography, J. Chromatogr. (lu.se)

Gas chromatography (GC) analyses of odors from individual flowers showed less intraspecific variation in the odor bouquets of the biologically active compounds as compared to nonactive compounds. (bioone.org)
The bioautography of TLC chromatogram showed single band exhibited antibacterial activity and phytocompound from this band was isolated and identified as 5,6,7,8-tetrahydro-1,2,4-benzotriazine-3-amine using gas chromatography-mass spectroscopy analyses. (ijpsonline.com)

The gas chromatography-mass spectroscopy analysis was performed for the isolated active components exhibited antimicrobial activity. (ijpsonline.com)

ISO 22892:2006 is intended for use with standards developed for the determination of specific compounds. (iso.org)
Although many studies about the application of seaweeds in various areas are available, these data are mostly about the raw extracts and not about specific compounds, such as seaweeds pigments. (researchgate.net)

This document specifies a method for the determination of alkylmercury compounds in filtered water samples by gas chromatography-mass spectrometry after phenylation and solvent extraction. (iso.org)
This method is applicable to determination of individual methylmercury (MeHg) and ethylmercury (EtHg) compounds in surface water and waste water. (iso.org)
Routine work includes determination of molecular formula and accurate mass with an accuracy of ± 1 mDa of compounds with m/z up to 3000 mDa. (lu.se)

This is the first report of GC-MS based metabolite profiling to detect the various bioactive compounds in methanolic extracts of Vincetoxicum rossicum and Marsdenia edulis . (phcogj.com)
These bioactive compounds revealed by GC-MS analysis in crude extracts of A. quisqualis had a stronger antifungal and antibacterial activity against E. necator . (ansfoundation.org)
We collected the pharmacological applications of Aesculus hippocastanum L . extracts and escin as the cheif bioactive compound and their uses in traditionally and clinically for the management of various disorders. (degruyter.com)
This review describes the efficacy of A. hippocastanum L. extracts and their bioactive compounds. (degruyter.com)
Thin-layer chromatography-directed bioautography was performed to determine the phytochemicals of the extracts and their antimicrobial activity. (ijpsonline.com)

To determine the key aroma compounds in Chinese rice wine (CRW), four types of CRW (YH, JF, SN, and XX) were analyzed by gas chromatography-mass spectrometry (GC-MS), gas chromatography-olfactometry (GC-O), and sensory evaluation. (unboundmedicine.com)
The contributions of the key aroma compounds to the flavor characteristics were determined by partial least squares regression. (unboundmedicine.com)
Sixty-one aroma compounds were detected. (unboundmedicine.com)
On the basis of their odor active values, 18 odor-active compounds were determined as key aroma compounds. (unboundmedicine.com)
Ethyl isovalerate, ethyl butyrate, ethyl acetate, ethyl hexanoate, and phenylethyl alcohol were key aroma compounds in all four types of wine. (unboundmedicine.com)
The project identified the main aroma compounds in three New Zealand hop varieties and noted the aromas that made these varieties distinct. (otago.ac.nz)
Currently, there is very limited knowledge on the complex chemical composition and aroma compounds that are present in recently released New Zealand hop varieties. (otago.ac.nz)
The present study aims to characterize the aroma compounds of selected New Zealand hop varieties. (otago.ac.nz)

Like liquid chromatography-mass spectrometry, it allows analysis and detection even of tiny amounts of a substance. (wikipedia.org)
The odor threshold values (i.e., detection and recognition values) were determined for all compounds in the matrix apple juice. (nih.gov)
The method has been modified to use 3M 3520 Organic Vapor Monitors (OVM) (manufactured without glued-on labels) as the sampling media and gas chromatography/mass spectrometry (GC/MS) as the detection device (2). (cdc.gov)
24 compounds were found to be biologically active in male olfactory receptors based on gas chromatography with electroantennographic detection (GC-EAD). (bioone.org)

Gas chromatography coupled with mass spectrometry (GC-MS) was used to analyze for phytochemicals and bioactive compounds in three species of Apocynacae, Gongronema latifolium , Vincetoxicum rossicum and Marsdenia edulis commonly found in tropical rainforest vegetation and used as food and traditional medicine by locals. (phcogj.com)

Ten compounds from the grapes, including 2-phenylethanol and beta-damascenone, were also identified in the corresponding wines. (unboundmedicine.com)
The encapsulation process involved spray-drying bioactive compounds extracted from grapes. (bvsalud.org)

Gas chromatography-mass spectrometry (GC-MS) has been successfully applied for the identification and quantification of hop oil constituents. (otago.ac.nz)

The ABP had a greater protective effect on the healthy liver compared to fenofibrate treatment due to its bioactive compound content. (bvsalud.org)

Recent investigations have shed light on the potential of seaweed, an abundant source of bioactive compounds, to mitigate and combat neurodegenerative diseases. (researchgate.net)

To generate metabolomic profiles of plasma and serum samples, the researchers used gas chromatography-mass spectrometry and liquid chromatography-tandem mass spectrometry to identify 477 metabolites. (medscape.com)
These compounds included 2 sphingomyelins, 1 phosphatidylcholine, 1 sphinganine-phosphate, and 1 ceramide, a finding that further supports the role of ceramides in human pancreatic cancer, the researchers say. (medscape.com)

This study is important for (1) alerting the firefighter community to potential new exposures, (2) expanding the current targeted list of toxicants, and (3) finding biomarkers of response to firefighting activity as reflected by changes in endogenous compounds. (cdc.gov)
This sensitive and robust triple quadrupole mass spectrometer is used for analysis of low (ppb) levels of environmental compounds and biomarkers. (lu.se)

Twenty-five components were identified as odor-active compounds. (unboundmedicine.com)

The research seeks to understand early solar system organic chemistry and the possible contribution of extraterrestrial organic compounds that may have led to the origin of life. (seti.org)
This will establish references for the same compounds in extraterrestrial materials. (seti.org)

This study aimed to investigate the effects of spontaneous fermentation on physicochemical characteristics, bioactive compounds, and antioxidant activity of acerola and guava fruit industrial by-products. (bvsalud.org)

Over the years, technologic advances in electronics and detectors have allowed GC/MS to detect ever smaller concentrations of compounds, as has the addition of other analytical techniques, such as liquid chromatography. (medscape.com)

A compilation of specific bimolecular rate constants for the reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals with inorganic and organic compounds in aqueous solution. (cdc.gov)
In: Kinetics and mechanisms of the gas-phase reactions of the hydroxyl radical with organic compounds. (cdc.gov)
Dr George Cooper's work involves the analysis of meteoritic organic compounds (the oldest compounds in the solar system) to determine their cosmo-chemical origins. (seti.org)
He also does research on laboratory simulations of how such organic compounds might have been produced in interstellar space. (seti.org)

The molecules are retained by the column and then elute (come off) from the column at different times (called the retention time), and this allows the mass spectrometer downstream to capture, ionize, accelerate, deflect, and detect the ionized molecules separately. (wikipedia.org)
Therefore, when an identifying mass spectrum appears at a characteristic retention time in a GC-MS analysis, it typically increases certainty that the analyte of interest is in the sample. (wikipedia.org)
GC/MS analysis allows separation of compounds based on their retention time within a chromatography column and identification of each compound by the characteristic fragments into which a given chemical is broken following ionization of the compound. (medscape.com)

Based on this result, an extensive chemical investigation of the CH2Cl2-MeOH (1:1) extract of this plant was carried out, leading to the isolation of a new ceramide, named entadamide (1), together with nine known compounds: monomethyl kolavate (2), 24-hydroxytormentic acid (3) chondrillasterol (4), 3-O-β-D glucopyranosylstigma. (medworm.com)

GC-MS profiling of the species revealed biologically functional compounds with therapeutic properties including linoleic acid, phytol, neophytadiene, n-hexadecanoic acid, squalene, transfarnesol, 5-pentadecen-7-yne, and mercaptoacetic acid. (phcogj.com)

It is not possible to make an accurate identification of a particular molecule by gas chromatography or mass spectrometry alone. (wikipedia.org)
ISO 22892:2006 gives criteria for gas chromatography and mass spectrometry (GC-MS) identification of target compounds in soil samples. (iso.org)
The identification criteria are based on the comparison of retention times followed by interpretation of the electron ionization mass spectra, or if necessary, additional mass spectrometric techniques and other relevant factors. (iso.org)
As technology develops, spectrum analysis has become the main method for the analysis and identification of compounds. (hindawi.com)
Automated compound deconvolution, alignment across samples, and identification of metabolites by spectral library matching in Gas Chromatography - Mass spectrometry (GC-MS) untargeted metabolomics. (r-project.org)
As well as the separation and purification of these compounds for additional testing, or even identification. (jove.com)
Other fentanyl-related compounds have been reported by the DEA National Forensic Laboratory Information System (NFLIS), which systematically collects drug identification results from drug cases submitted for analysis to forensic laboratories (referred to as drug submissions). (cdc.gov)

Breath samples from firefighters functioning in attack and search positions were examined for target and non-target compounds in automated thermal desorption-GC/MS (ATD-GC/MS) selected ion monitoring (SIM)/scan mode and reviewed for prominent chemicals. (cdc.gov)

The implementation of pyrolysis process is able to produce biochar, liquid and gas product from biodegradable waste. (kth.se)
The gas and liquid production were promoted while the biochar yield was suppressed in the presence of the H2 atmosphere. (kth.se)
The composite of 75% sludge digestate and 25% salix presented the highest mass and energy yields of the organic fraction in the liquid product. (kth.se)

The mass spectrometry process normally requires a very pure sample while gas chromatography using a traditional detector (e.g. (wikipedia.org)
Analysis is performed using an HP 5890 Series II Plus GC (Gas Chromatograph) with an HP 5972 MSD (Mass Selective Detector Quadrupole Mass Spectrometer) and EnviroQuant software. (cdc.gov)
Methyl esters fatty acids analysis were carried out using the gas chromatography (GC) method with a mass selective detector and using the database library NIST 14.L to identify the compounds present in the corn seed oil.Results: Methyl esters fatty acids were identified from corn (Z. mays) seeds using the GC mass spectrometer (GC-MS) analytical method. (researchgate.net)

The first on-line coupling of gas chromatography to a mass spectrometer was reported in the late 1950s. (wikipedia.org)
In 1964, Electronic Associates, Inc. (EAI), a leading U.S. supplier of analog computers, began development of a computer controlled quadrupole mass spectrometer under the direction of Robert E. Finnigan. (wikipedia.org)
The GC-MS is composed of two major building blocks: the gas chromatograph and the mass spectrometer. (wikipedia.org)
The mass spectrometer does this by breaking each molecule into ionized fragments and detecting these fragments using their mass-to-charge ratio. (wikipedia.org)
Sometimes two different molecules can also have a similar pattern of ionized fragments in a mass spectrometer (mass spectrum). (wikipedia.org)
Combining the two processes reduces the possibility of error, as it is extremely unlikely that two different molecules will behave in the same way in both a gas chromatograph and a mass spectrometer. (wikipedia.org)
Methyl esters fatty acids wer e identified from corn ( Z. mays ) seeds using the GC mass spectrometer (GC-MS) analytical method. (researchgate.net)

The ethanol extract of leaf of Melia azedarach exhibited significant antimicrobial activity and the compound 5,6,7,8-tetrahydro-1,2,4-benzotriazine-3-amine might be responsible for antimicrobial activity. (ijpsonline.com)
There is a continuous and urgent need to discover new antimicrobial compounds with diverse chemical structures and novel mechanisms of action for new and re-emerging infectious diseases [ 7 ]. (ijpsonline.com)

Isotope effects in the chemistry of atmospheric trace compounds. (mpg.de)
This project studies the chemistry of nitrogen compounds on past and present Mars to better understand what nitrogen compounds existed on Mars and how that may have changed over time. (seti.org)

Multiplexed Profiling and Data Processing Methods to Identify Temperature-Regulated Primary Metabolites Using Gas Chromatography Coupled to Mass Spectrometry. (mpg.de)
Of these metabolites, 10 compounds made up the final panel. (medscape.com)

Fifteen relevant off-flavor compounds that are formed in apple juice, for example, by the strains Alicyclobacillus acidoterrestris and Actinomycetes (Streptomyces ssp. (nih.gov)
Eight tainted apple juice samples were analyzed for the presence of the 2 strains and the 15 off-flavor compounds. (nih.gov)

Information on levels of exposure to these compounds is essential to determine the need for regulatory mechanisms to reduce the levels of hazardous air pollutants to which the general population is exposed. (cdc.gov)
The synergistic effect between the sludge digestate and salix was studied with respect to reaction mechanisms, carbon number distribution of the compounds in organic fraction, and biochar stability. (kth.se)
however, mechanisms through which these bioactive compounds act on epithelial cells have not been identified. (biorxiv.org)
In this comprehensive review, the accumulating evidence supporting the neuroprotective properties of seaweed-derived compounds is evaluated and their putative mechanisms of action are eluci. (researchgate.net)

Gas chromatography-mass spectrometry (GC-MS) is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample. (wikipedia.org)
Gas chromatography-mass spectrometry, thin-layer chromatography, atomic absorption spectrometry, etc. are employed to monitor these substances. (vetmeduni.ac.at)

Screening 2000 individuals from consecutive mass-spectrometric studies, we herein identify five healthy German adults without exhaled isoprene. (nature.com)
In 1960, mass-spectrometric techniques had detected the presence of exhaled isoprene, which was later quantified by Jansson et al. (nature.com)
CWO primarily consist of a mixture of structurally related terpenes, a class of chemical compounds composed of isoprene units with distinct aromatic qualities that plants generate for defensive purposes. (biorxiv.org)

It could very well be that avocado seed husks, which most people consider as the waste of wastes, are actually the gem of gems because the medicinal compounds within them could eventually be used to treat cancer, heart disease and other conditions," says Debasish Bandyopadhyay, Ph.D. "Our results also suggest that the seed husks are a potential source of chemicals used in plastics and other industrial products. (acs.org)

Methods of analysis include gas chromatography-mass spectrometry (GC-MS), which separates and gives unique fragmentation patterns for individual compounds. (seti.org)

By 1966 Finnigan and collaborator Mike Uthe's EAI division had sold over 500 quadrupole residual gas-analyzer instruments. (wikipedia.org)
Vacuum cleanliness is normally monitored with a residual gas analyzer, but this has not shown carbon-containing species in sufficient concentration to account for the observed carbon buildup. (nist.gov)

It can be used for analysis of high-molecule compounds and storage of biological specimens. (memphis.edu)

Bioactive compounds were identified by comparing the retention times with those of authentic compounds and spectral data obtained from National Institute of Standards and Technology (NIST) library. (phcogj.com)
Data demonstrate that there are non-targeted compounds in firefighters' breath that are indicative of environmental exposure despite the use of protective gear, and this information may be further utilized to improve the effectiveness of personal protective equipment. (cdc.gov)
NIST Mass Spectrometry Data Center. (chemspider.com)
The amassed data distinctly show that an amalgamation of wall materials can indeed considerably enhance the stability of encapsulated bioactive compounds, presenting promising applications within the realms of both the food and pharmaceutical industries. (bvsalud.org)

The gas chromatograph utilizes a capillary column whose properties regarding molecule separation depend on the column's dimensions (length, diameter, film thickness) as well as the phase properties (e.g. 5% phenyl polysiloxane). (wikipedia.org)
Li K, Al-Rudainy B, Sun M, Wallberg O, Hulteberg C, and Tunå P. Membrane Separation of the Base-Catalyzed Depolymerization of Black Liquor Retentate for Low-Molecular-Mass Compound Production. (lu.se)

The method can be applied to samples containing 0,2 μg/l to 10 μg/l of each compound as mercury mass. (iso.org)

A second experiment was conducted with the same ten DDT-related compounds and twelve selected PCB (polychlorinated biphenyl) congeners under conditions characteristic of a coastal marine field site (viz. (usgs.gov)

Anatomy7

Organisms7

Chemicals and Drugs70

Analytical, Diagnostic and Therapeutic Techniques and Equipment42

Phenomena and Processes27

Disciplines and Occupations5

Anthropology, Education, Sociology and Social Phenomena2

Technology, Industry, Agriculture1

Information Science4

Health Care9

Volatile21

High-performance li4

Time-of-flight ma1

Characterization6

VOCs2

Phenolic compounds4

Analyses2

Spectroscopy1

Specific compounds2

Determination3

Extracts5

Aroma8

Detection4

Phytochemicals1

Grapes2

Quantification1

Bioactive compound1

Abundant1

Researchers2

Biomarkers2

Odor1

Extraterrestrial2

Fruit1

Concentrations1

Organic compounds4

Retention time3

Known compounds1

Functional compounds1

Identification7

Thermal1

Liquid3

Detector3

Spectrometer7

Antimicrobial2

Chemistry2

Metabolites2

Flavor2

Mechanisms4

Substances2

Isoprene3

Chemicals1

Methods1

Residual gas-anal2

Biological1

Data4

Separation2

Samples1

Characteristic1