Roman Zubarev
Odense University
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Publication
Featured researches published by Roman Zubarev.
Journal of Materials Chemistry | 2000
Dorthe Damgaard; Mogens Brøndsted Nielsen; Jesper Lau; Kenneth B. Jensen; Roman Zubarev; Eric Levillain; Jan Becher
Two linear oligo-TTFs were synthesised employing a stepwise nstrategy involving two different thiolate protecting groups. These linear nTTFs were incorporated into donor–acceptor rotaxanes with the cyclic nacceptor, cyclobis(paraquat-p-phenylene). Moreover, a prototype rotaxane based on a bis(pyrrolo)-TTF nwas prepared and studied.
Rapid Communications in Mass Spectrometry | 1999
Kristina Håkansson; Roman Zubarev; Ramal V. Coorey; Victor L. Talrose; P. Håkansson
An HMX/insulin two-layer system was chosen as a model for further investigation of the matrix properties of explosive materials for protein analytes in plasma desorption mass spectrometry. The dependencies of the molecular ion yield and average charge state as a function of the analyte thickness were studied. An increase in the charge state of multiply protonated molecular species was confirmed as the major matrix effect, with the average charge state z at the smallest thickness studied being higher than in matrix-assisted laser desorption/ionization and closer to the value obtained in electrospray ionization under standard acidic conditions. Observed charge state distributions are significantly narrower than the corresponding Poisson distributions, which suggests that the protonation of insulin is limited in plasma desorption by the number of basic sites in the molecule, similar to electrospray ionization. Both the curve displaying total molecular ion yield and the one showing the total charge (proton) yield as a function of the insulin thickness have maxima at a thickness different from an insulin monolayer. These observations diminish the significance of a matrix/analyte interface mechanism for the explosive matrix assistance. Instead, a mechanism related to the chemical energy release during conversion of the explosive after the ion impact is proposed. As additional mechanisms, enhanced protonation of the analyte through collisions with products of the explosive decay is considered, as well as electron scavenging by other products, which leads to a higher survival probability of positively charged protein molecular ions. Copyright 1999 John Wiley & Sons, Ltd.
Archive | 2003
Roman Zubarev; Frank Kjeldsen; Igor Ivonin; Oleg Silivra
Eur J Mass Spectrom (Chichester, Eng) | 2003
Helen J. Cooper; Kristina Håkansson; Alan G. Marshall; Robert R. Hudgins; Kim F. Haselmann; Frank Kjeldsen; Bogdan A. Budnik; Nick C. Polfer; Roman Zubarev
Archive | 2006
Roman Zubarev; Alexander Misharin; Oleg Silivra; Frank Kjeldsen
Archive | 2006
Frank Kjeldsen; Alexander Misharin; Oleg Silivra; Roman Zubarev
Archive | 2005
Armin Holle; Frank Kjeldsen; Alexander Misharin; Oleg Silivra; Roman Zubarev
Archive | 2010
Alexander Misharin; Roman Zubarev
Archive | 2007
Roman Zubarev; Alexander Misharin
Archive | 2005
Armin Holle; Frank Kjeldsen; Alexander Misharin; Oleg Silivra; Roman Zubarev