Group identification of O-alkyl alkylphosphonothionofluoridates by electron ionization mass spectra on the basis of generalized spectral images of taxonomic groups
T14N3
Yu.I. Morozik, A.V. Dudkin, I.V. Ribal’chenk, A.R. Naumov
A method for group identification of poorly studied highly toxic O-alkyl alkylphosphonothionofluoridates by electron ionization mass spectra is proposed. The method is based on the use of generalized spectral images of four taxonomic groups of this class, subjected to control under the Convention on the Prohibition of Chemical Weapons. Generalized spectral images were found by analyzing the revealed regularities of fragmentation of these compounds. The advantage of the proposed method is that the assignment of the test substance to one of the class groups and to the class as a whole is a quick automated standard procedure used in the NIST information retrieval system.
Peculiarities of mass spectrometric detection of anthocyanins in high-performance liquid chromatography
T14N2
V.I. Deineka, A.N. Sidorov, A.N. Chulkov, L.A. Deineka
The dependence of the fragmentation degree of anthocyanin “molecular” ions upon cone voltage of mass spectrometric electrospray/ionization detector was studied. It was found that the voltage required for the fragmentation of 50 % of the original “molecular” ions, Ef(0.5) increases with the number of glycoside residues. The fragmentation results in the removal of total glycoside residues regardless of their structures. In the case of 3.5-diglycosides, two types of fragment ions were formed due to the loss of glycosidic residues from different positions while the ratio of their peak intensities was opposite to that of the masses of neutrals eliminated. The values of Ef(0.5) for the monoglycosides (190 V), diglycosides (229 V), triglycosides (267 V), and for some acylated cyanidin-3,5-diglycosides were found. These results were given for gradient separation of anthocyanins by reverse phase HPLC in aqueous acetonitrile containing 10 vol. % of formic acid using a quadrupole mass spectrometric detection.
Gas-phase fragmentation studies of biotinylated, hexaethylene glycol-spacered oligosaccharides — molecular probes — using electrospray mass spectrometry on hybrid high-resolution mass spectrometer
T13N3
A.O. Chizhov, D.A. Argunov, M.L. Gening, E.V. Sukhova, E.A. Khatuntseva, A.A. Karelin,
B.S. Komarova, M.V. Orekhova, V.B. Krylov, D.V. Yasunskii, Yu.E. Tsvetkov, N.E. Nifantiev
Electrospray ionization high-resolution mass spectra of biotinylated, hexaethylene glycol spacered molecular probes bearing biologically relevant carbohydrate moieties in positive and negative modes were recorded and interpret. Collisionally-induced decay mass spectra (positive mode) reveal different patterns depending on the charge of the parent ion, attached cations (or ions), the composition, and the sequence of carbohydrate fragment. The most intense peaks (two series) originate from the sequential cleavage of glycoside bonds resulting in charge location on the “reducing” end (Y series, observed for all compounds studied) or “non-reducing” end (B series). Fragmentation of the hexaethylene glycol chain giving rise to the cleavage of the C—O bond remoted from the biotin moiety is observed. Other fragment ions lighter than the mentioned above on the difference of (C2H4O)n were absent or much smaller. Similar fragmentation was found for all of the non-sulfated, biotinylated glycosides with the hexaethylene glycol spacer thus demonstrating that this type of fragmentation was characteristic for such molecular probes. Similar cleavages along with decay of biotin moiety via elimination of H2S and H2CS were observed for negative ions in collisionally-induced decay mass spectra of sulfated and neutral molecular probes.
Detection of metabolites of flavonoids Epimedium in rats urine by high performance liquid chromatography-high-resolution tandem mass spectrometry
T13N2
O.A. Shevlyakova, K.J. Vasil’yev, A.A. Ihalaynen, A.M. Antokhin, V.F. Taranchenko,
V.M. Goncharov, A.V. Aksenov, D.A. Mitrofanov, I.A. Rodin, O.A. Shpigun Читать полностью
Prediction of electron ionization mass spectra of О-alkyl methylfluorothionophosphonates
T13N1
Yu.I. Morozik, A.V. Dudkin2*, Yu.V. Tкachuk, I.V. Rybal’chenko, R.V. Khatymov3
Determination of structural features of o-alkyl-s-2-(n, n-dialkylamino) ethylalkylthiophosphonates from their electron ionization mass spectra
T12N4
A.G. Terentyev, Yu.I. Morozik, I.V. Rybal’chenko,
A.V. Dudkin, A.O. Smirnov, G.V. Galyaev Читать полностью
Electrospray ionization mass spectra of derivatives of 2-phenylthio-N-trifluoroacetylneuraminic acid
T12N1
Electrospray ionization mass spectra of derivatives
of 2-phenylthio-N-trifluoroacetylneuraminic acid
A.O. Chizhov, N.M. Podvalnyy, A.I. Zinin, N.N. Malysheva, L.O. Kononov
Application of tandem electrospray/ionization mass spectrometry for identification of icariin in plant materials
T11N4
Application of tandem electrospray/ionization mass spectrometry
for identification of icariin in plant materials
O.A. Shevlyakova, A.A. Ihalaynen, A.M. Antokhin, V.F. Taranchenko, V.M. Goncharov,
A.V. Aksenov, D.A. Mitrofanov, I.A. Rodin, O.A. Shpigun
Масс‑спектры матрично‑активированной лазерной десорбции/ионизации некоторых производных фуллеренов
Sorry, this entry is only available in Русский.
Особенности массспектров МАЛДИ третбутиловых эфиров фуллеропролинов
Sorry, this entry is only available in Русский.
