Rapid Communications in Mass Spectrometry
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Photodynamic oxidation of Escherichia coli membrane phospholipids: new insights based on lipidomicsRATIONALE The irreversible oxidation of biological molecules, such as lipids, can be achieved with a photosensitizing agent and subsequent exposure to light, in the presence of molecular oxygen. Although lipid peroxidation is an important toxicity mechanism in bacteria, the alterations caused by the photodynamic therapy on bacterial phospholipids are still...
Rapid Communications in Mass Spectrometry - Tập 27 Số 23 - Trang 2717-2728 - 2013
Sequence distribution of β‐hydroxyalkanoate units in bacterial copolyesters determined by desorption chemicl ionization mass spectrometryAbstract The sequence distributions of poly(β‐hydroxyalknoate) copolymers were determined by analyzing oligomers obtaned by the pyrolysis direct‐chemical‐ionization (DCI) mass spectrometry technique. Oligomers up to nonamers were identified and the comparison between the experimental and calculated peak intensities makes it possible to calculate repeating unit compo... ...
Rapid Communications in Mass Spectrometry - Tập 6 Số 11 - Trang 702-706 - 1992
Characterization of high molecular weight macrocycles by desorption chemical ionization mass spectrometryAbstract A series of multi‐armed macrocycles with molecular weights up to 4400 Da was studied by desorption chemical ionization. Both negative‐ and positive‐ion spectra exhibited excellent signal‐to‐noise ratio, despite the limited amount of material sampled (0.1–1 pmol). The molecular ions generally represent the base peaks of the spectra, but the extent of fragmen... ...
Rapid Communications in Mass Spectrometry - Tập 3 Số 4 - Trang 106-109 - 1989
Direct chemical ionization mass spectrometry of short‐chain polysaccharidesAbstract Underivatized short‐chain polysaccharides such as two inulins from different plants containing up to 35‐40 monosaccharide units with molecular weights of up to 6500 Da and dextran T 1.5 containing up to 16‐20 monosaccharide units with molecular weights of up to 3200 Da have been investigated by direct chemical lionization. Under soft ionization conditions s... ...
Rapid Communications in Mass Spectrometry - Tập 6 Số 2 - Trang 143-146 - 1992
Aromatic hydrocarbon derivatives of fullerencesAbstract The fullerences C60 and C70 form adducts with toluene, p‐xylene and other aromatic compounds when refluxed in these solvents in the presences of FeCl3 . Benzene derivatives are produced only when bromine is also present. Mass spectra of the reaction mixtures indicate the presence of derivatives i... ...
Rapid Communications in Mass Spectrometry - Tập 5 Số 10 - Trang 472-474 - 1991
Error propagation in normalization of stable isotope data: a Monte Carlo analysisAbstract A higher analytical precision of a stable isotope ratio mass spectrometer does not automatically guarantee accurate determination of the true isotope composition (δ ‐value) of samples, since estimates of true δ ‐values are obtained from the normalization of raw isotope data. We performed both Monte Carlo s... ...
Rapid Communications in Mass Spectrometry - Tập 24 Số 18 - Trang 2697-2705 - 2010
Tracing the geographical origin of beefs being circulated in Korean markets based on stable isotopesAbstract We have examined the carbon, nitrogen and oxygen isotopic compositions of American, Mexican, Australian, New Zealand and Korean beefs, which are currently being circulated in Korean markets, to check whether stable isotope ratios can identify their country of origin. Each beef exhibited statistically distinct isotopic compositions, especially in oxygen and ... ...
Rapid Communications in Mass Spectrometry - Tập 24 Số 1 - Trang 155-159 - 2010
Development of a multi‐target screening analysis for 301 drugs using a QTrap liquid chromatography/tandem mass spectrometry system and automated library searchingAbstract A new multi‐target screening (MTS) procedure for drugs in blood and urine for toxicological analysis has been developed using a hybrid triple‐quadrupole linear ion trap mass spectrometer (QTrap) for the fast detection and identification of 301 forensically important drugs, e.g. tranquilizers (benzodiazepines), hypnotics, drugs of abuse (opiates, cocaine, am... ...
Rapid Communications in Mass Spectrometry - Tập 19 Số 10 - Trang 1332-1338 - 2005
Characterization of oxygenated derivatives of isoprene related to 2‐methyltetrols in Amazonian aerosols using trimethylsilylation and gas chromatography/ion trap mass spectrometryAbstract In the present study, we have tentatively identified the structures of three oxygenated derivatives of isoprene in Amazonian rain forest aerosols as the C5 alkene triols, 2‐methyl‐1,3,4‐trihydroxy‐1‐butene (cis and trans ) and 3‐methyl‐2,3,4‐trihydroxy‐1‐butene. The formation of these... ...
Rapid Communications in Mass Spectrometry - Tập 19 Số 10 - Trang 1343-1351 - 2005
Discrimination factors of carbon and nitrogen stable isotopes from diet to hair in captive large Arctic carnivores of conservation concernRationale Stable isotope analysis is widely used to reconstruct diet, delineate trophic interactions, and determine energy pathways. Such ecological inferences are based on the idea that animals are, isotopically, what they eat but with a predictable difference between the isotopic ratio of a consumer and that of its diet, coined as the discrimination fact...
Rapid Communications in Mass Spectrometry - Tập 32 Số 20 - Trang 1773-1780 - 2018
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