- Mass spectrometry (MS) is an analytical technique for the determination of the elemental composition of a sample or molecule. It is also used for elucidating the chemical structures of molecules, such as peptides and other chemical compounds. The MS principle consists of ionizing chemical compounds to generate charged molecules or molecule fragments and measurement of [...]
- In 1886, Eugen Goldstein observed rays in gas discharges under low pressure that traveled away from the anode and through channels in a perforated cathode, opposite to the direction of negatively charged cathode rays (which travel from cathode to anode). Goldstein called these positively charged anode rays “Kanalstrahlen”; the standard translation of this term into [...]
- Mass Spectrometry Protocols
- Mass Spectrometry Methods
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Mass spectrometric monitoring of gas dynamics in peat monoliths: effects of temperature and diurnal cycles on emissions [An article from: Atmospheric Environment]
Mass spectrometric monitoring of gas dynamics in peat monoliths: effects of temperature and diurnal cycles on emissions [An article from: Atmospheric Environment]
This digital document is a journal article from Atmospheric Environment, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Membrane inlet mass spectrometry was used to monitor dissolved gas concentrations and gas exchange rates of CO”2, CH”4 and O”2 in peat cores from three very different locations in the Northern Hemisphere: Kopparas Mire (Sweden), Hestur Site (Iceland), and Ellergower Moss (Scotland). With an increase of temperature gas solubilities are reduced, and due to additionally increased microbial activities higher gas emission rates for both CO”2 and CH”4 were observed. Experimental alterations of temperature and photosynthetically active radiation (PAR) also drastically effect daytime carbon dioxide emission rates as a result of changes in microbial and plant physiology. The impact of ebullition on gas emission rates was indicated by continuous measurements of gas concentrations in the headspace of Icelandic and Swedish cores using two different experimental setups. For methane, up to 23 of the total emission from cores from both sites is released by ebullition. Total gas emission rate measurements in this study were similar for both experimental setups, and revealed gas effluxes comparable with field measurements for Scottish and Icelandic peat.
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Residue determination of cyromazine and its metabolite melamine in chard samples by ion-pair liquid chromatography coupled to electrospray tandem mass … [An article from: Analytica Chimica Acta]
Residue determination of cyromazine and its metabolite melamine in chard samples by ion-pair liquid chromatography coupled to electrospray tandem mass … [An article from: Analytica Chimica Acta]
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A method has been developed for the sensitive and selective determination of cyromazine and its metabolite melamine in chard samples. Both compounds are small polar basic molecules, making their determination at residue levels complicated. The method involves an extraction procedure with phosphate buffer and methanol using high-speed blender, the addition of tridecafluoroheptanoic acid (TFHA) as ion-pair reagent and the injection of the five-fold diluted extract on liquid chromatography coupled to electrospray tandem mass spectrometry (LC-ESI-MS/MS). The method has been validated for chard samples, spiked at 0.05 and 0.5mgkg^-^1. Quantification was carried out by using matrix-matched standards calibration and recoveries were satisfactory, with mean values for cyromazine of 103% and 93%, and relative standard deviations lower than 7%. In the case of melamine, recoveries were 89% and 86%, with relative standard deviations lower than 13%. A limit of quantification of 0.05mgkg^-^1 was obtained for both compounds, with the limit of detection below 0.01mgkg^-^1. The method, with very little sample handling and good sensitivity, was applied to the rapid determination of low residue levels of these compounds in chards from field residue trials. All the quality controls included during the analysis were satisfactory with average recoveries of 92% and 78% for cyromazine and melamine, respectively.
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A generalised method for the extraction of chemically resolved mass spectra from Aerodyne aerosol mass spectrometer data [An article from: Journal of Aerosol Science]
A generalised method for the extraction of chemically resolved mass spectra from Aerodyne aerosol mass spectrometer data [An article from: Journal of Aerosol Science]
This digital document is a journal article from Journal of Aerosol Science, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A generalised method for the deconvolution of mass spectral data from the aerodyne aerosol mass spectrometer (AMS) is presented. In this instrument, the sampled ensemble of gas and non-refractory particle phase materials interfere with each other in the mass spectra and the data must be systematically analyzed to generate meaningful, quantitative and chemically resolved results. The method presented here is designed to arithmetically separate the raw data into partial mass spectra for distinct chemical species. This technique was developed as part of the AMS analysis tools introduced by Allan et al. (J. Geophys. Res. Atmos. 108 (2003) 4090) and is in use by most groups within the AMS users community. This technique employs a user-definable ‘fragmentation table’ for each chemical species or group of species, and examples of some tables designed for the interpretation of field data are given. The ongoing work being performed to develop and validate the tables will be presented in future publications.
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Price: $ 4.95
Detection in urine of efaproxiral (RSR13), a potential doping agent, by a routine screening procedure based on methylation followed by gas chromatography/mass … [An article from: Analytica Chimica Acta]
Detection in urine of efaproxiral (RSR13), a potential doping agent, by a routine screening procedure based on methylation followed by gas chromatography/mass … [An article from: Analytica Chimica Acta]
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Efaproxiral (also known as RSR13) is a synthetic allosteric modifier of hemoglobin. The ability to increase maximal muscle oxygen uptake makes RSR13 a potential performance-enhancing agent for athletes and, therefore, a new agent to be taken into account by the antidoping control laboratories. In this work, a new method for the detection of efaproxiral in urine by gas chromatography/mass spectrometry is described.
List Price: $ 8.95
Price: $ 8.95
Mass Spectrometry News
Show has largest travelling exhibit of mummies
LOS ANGELES, Calif. – A 10-month-old baby who lived in Peru 6,420 years ago and a 17th-century nobleman; a South American woman with a tattoo on each breast and one on her face, a woman who had tuberculosis, a child who had a heart condition and a youngster with [...]
LA show has largest traveling exhibit of mummies
A 10-month-old baby who lived in Peru 6,420 years ago and a 17th-century nobleman; a South American woman with a tattoo on each breast and one on her face, a woman who had tuberculosis, a child who had a heart condition and a youngster with a facial tumor.
Read [...]
Revealed: Art’s forgeries, fakes and mistakes
LONDON (Reuters) – A phony Botticelli, a faux Rembrandt, a Holbein hoax alongside other forgeries, fakes and mistakes come under the microscope in the latest exhibition at London’s National Gallery.
Read more on Reuters
Mass Spectrometry Videos
Jimmy Kimmel Live – The fourth part of Jimmy’s interview with James Franco
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A good basic introduction to what spectroscopy is and how it’s used in astronomy. See en.wikipedia.org and so on for more detailed information.
Presentations and discussion session. Presentations: 1) Essential Needs and Current Gaps: Surveillance and Laboratory Support for Vaccine Development by Dr. Nancy Cox 2) Laboratory Support for Influenza Vaccine Development – Potency Reagents by Dr. Jerry P. Weir www.globalhealth.gov