Publications by Vladimir Kopysov

Identification of Isomeric Metabolites Using Cold Ion Spectroscopy Add-on to Orbitrap-Based Mass Spectrometer

Oleg Boyarkine, Andrei Zviagin, Vladimir Kopysov

The identification of chemical structures of metabolites available in trace-level quantities remains a challenging task in analytical chemistry. Although cold ion spectroscopy (CIS) has considerable potential to assist in such identification, the widesprea ...

American Chemical Society (ACS)2025

Oligomers of diphenylalanine examined using cold ion spectroscopy and neural network-based conformational search

Oleg Boyarkine, Ruslan Yamaletdinov, Vladimir Kopysov

Diphenylalanine (Phe2) is the primary building block of many self-assembling nanostructures that are important in biology and materials science. Understanding the detailed mechanism of their formation requires knowledge of the structural motives that the s ...

2024

Quantification of enantiomers and blind identification of erythro-sphingosine non-racemates by cold ion spectroscopy

Oleg Boyarkine, Ruslan Yamaletdinov, Vladimir Kopysov

Enantiomers of a lipid erythro-sphingosine have been quantified with ≈4% accuracy by UV cold ion spectroscopy of their non-covalent complexes with a chiral aromatic molecule. The diastereomeric configuration of such complexes enables the quantification usi ...

2024

Gentle nano-electrospray ion source for reliable and efficient generation of microsolvated ions

Oleg Boyarkine, Andrei Zviagin, Vladimir Kopysov

We present herein the design of a nano-electrospray ion source capable of reliable generation of large quantities of microsolvated ions. The source is based on a triple molecular skimmer scheme and can be quickly tuned to generate bare ions or their ionic ...

AIP Publishing2022

Tracking local and global structural changes in a protein by cold ion spectroscopy

Natalia Nagornova, Oleg Boyarkine, Andrei Zviagin, Vladimir Kopysov

Characterization of native structures of proteins in the gas phase remains challenging due to the unpredictable conformational changes the molecules undergo during desolvation and ionization. We spectroscopically studied cryogenically cooled protonated pro ...

ROYAL SOC CHEMISTRY2022

Spectroscopic Evidence for Peptide-Bond-Selective Ultraviolet Photodissociation

Oleg Boyarkine, Vladimir Kopysov, Aleksandr Pereverzev

We study the photodissociation induced by ultraviolet excitation of amide bonds in gas-phase protonated peptides. Jointly, mass spectrometry and cold ion spectroscopy provide evidence for a selective non-statistical dissociation of specific peptide bonds i ...

2020

Identification and Quantification of Any Isoforms of Carbohydrates by 2D UV-MS Fingerprinting of Cold Ions

Oleg Boyarkine, Vladimir Kopysov, Viktoriia Aladinskaia

Biological functionality of isomeric carbohydrates may differ drastically, making their identifications indispensable in many applications of life science. Because of the large number of isoforms, structural assignment of saccharides is challenging and oft ...

2020

Method for Identification of Threonine Isoforms in Peptides by Ultraviolet Photofragmentation of Cold Ions

Oleg Boyarkine, Vladimir Kopysov, Aleksandr Pereverzev, Elizaveta Solovyeva

Identification of isomeric amino acid residues in peptides and proteins is challenging but often highly desired in proteomics. One of the practically important cases that require isomeric assignments is that associated with single-nucleotide polymorphism s ...

AMER CHEMICAL SOC2019

Gas-phase structures reflect the pain-relief potency of enkephalin peptides

Oleg Boyarkine, Vladimir Kopysov, Aleksandr Pereverzev

We use cold ion spectroscopy and quantum-chemical computations to solve the structures of opioid peptides enkephalins in the gas phase. The derived structural parameters clearly correlate with the known pharmacological efficiency of the studied drugs, sugg ...

2019

Interplay of H-Bonds with Aromatics in Isolated Complexes Identifies Isomeric Carbohydrates

Oleg Boyarkine, Ruslan Yamaletdinov, Vladimir Kopysov, Aleksandr Pereverzev

The tremendous isomeric diversity of carbohydrates enables a wide range of their biological functions but makes the identification and study of these molecules difficult. We investigated the ability of intermolecular interactions to communicate structural ...

Wiley-VCH Verlag GmbH2019