Rapid Communications in Mass Spectrometry
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Photodynamic oxidation of Escherichia coli membrane phospholipids: new insights based on lipidomics
Rapid Communications in Mass Spectrometry - Tập 27 Số 23 - Trang 2717-2728 - 2013
RATIONALEThe 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 unknown. In this work, we studied
the phot...
Sequence distribution of β‐hydroxyalkanoate units in bacterial copolyesters determined by desorption chemicl ionization mass spectrometry
Rapid Communications in Mass Spectrometry - Tập 6 Số 11 - Trang 702-706 - 1992
AbstractThe 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
compositions and sequence distribution...
Characterization of high molecular weight macrocycles by desorption chemical ionization mass spectrometry
Rapid Communications in Mass Spectrometry - Tập 3 Số 4 - Trang 106-109 - 1989
AbstractA 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 fragmentation increases as the source
te...
Direct chemical ionization mass spectrometry of short‐chain polysaccharides
Rapid Communications in Mass Spectrometry - Tập 6 Số 2 - Trang 143-146 - 1992
AbstractUnderivatized 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 such as ammonia chemical
ionizatio...
Aromatic hydrocarbon derivatives of fullerences
Rapid Communications in Mass Spectrometry - Tập 5 Số 10 - Trang 472-474 - 1991
AbstractThe 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 including
1:1 adducts, as well as products of multiple additions of the aromatic molecules
and th...
Error propagation in normalization of stable isotope data: a Monte Carlo analysis
Rapid Communications in Mass Spectrometry - Tập 24 Số 18 - Trang 2697-2705 - 2010
AbstractA 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 simulations and laboratory experiments to investigate aspects of error
propagation durin...
Tracing the geographical origin of beefs being circulated in Korean markets based on stable isotopes
Rapid Communications in Mass Spectrometry - Tập 24 Số 1 - Trang 155-159 - 2010
AbstractWe 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 carbon, because of the
different ...
Development of a multi‐target screening analysis for 301 drugs using a QTrap liquid chromatography/tandem mass spectrometry system and automated library searching
Rapid Communications in Mass Spectrometry - Tập 19 Số 10 - Trang 1332-1338 - 2005
AbstractA 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,
amphetamines, cannabinoids), antide...
Characterization of oxygenated derivatives of isoprene related to 2‐methyltetrols in Amazonian aerosols using trimethylsilylation and gas chromatography/ion trap mass spectrometry
Rapid Communications in Mass Spectrometry - Tập 19 Số 10 - Trang 1343-1351 - 2005
AbstractIn 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 oxygenated
derivatives of isoprene can be explained by acid‐catalyzed ring opening of
epoxydiol derivatives...
Discrimination factors of carbon and nitrogen stable isotopes from diet to hair in captive large Arctic carnivores of conservation concern
Rapid Communications in Mass Spectrometry - Tập 32 Số 20 - Trang 1773-1780 - 2018
RationaleStable 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 factor. Providing correct estimates of
diet‐con...
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