Biography:

In the past E.G. Vlakh has collaborated on articles with E.S. Sinitsyna and A.V. Hubina. One of their most recent publications is ReviewApplications of polymethacrylate-based monoliths in high-performance liquid chromatography. Which was published in journal Journal of Chromatography A.

More information about E.G. Vlakh research including statistics on their citations can be found on their Copernicus Academic profile page.

E.G. Vlakh's Articles: (4)

ReviewApplications of polymethacrylate-based monoliths in high-performance liquid chromatography

AbstractMonolithic columns were introduced in the early 1990s and have become increasingly popular as efficient stationary phases for most of the important chromatographic separation modes. Monoliths are functionally distinct from porous particle-based media in their reliance on convective mass transport. This makes resolution and capacity independent of flow rate. Monoliths also lack a void volume. This eliminates eddy dispersion and permits high-resolution separations with extremely short flow paths. The analytical value of these features is the subject of recent reviews. Nowadays, among other types of rigid macroporous monoliths, the polymethacrylate-based materials are the largest and most examined class of these sorbents. In this review, the applications of polymethacrylate-based monolithic columns are summarized for the separation, purification and analysis of low and high molecular mass compounds in the different HPLC formats, including micro- and large-scale HPLC modes.

Hydrophilic methacrylate monoliths as platforms for protein microarray

AbstractHydrophilic macroporous monolithic materials based on a copolymer of 2-hydroxyethyl methacrylate with glycerol dimethacrylate was synthesized by photo-initiated free-radical polymerization of monomers in a presence of the low molecular mass porogens, such as cyclohexanol, dodecanol, toluene and heptane, as well as the solutions of hydrophobic polymers, namely, polystyrene of different molecular weights and concentrations in toluene, and poly(dimethyl siloxane) in heptane. The Hildebrand solubility parameters were used to predict the diluent-polymer compatibility. Pore size distribution and surface area characterization have been assessed by mercury intrusion porosimetry; scanning electron microscopy was used to evaluate the differences in macroporous morphology obtained with different porogenic agents. The monolithic materials were covalently attached to a glass surface directly at polymerization step. Monolithic layers were applied as platforms for microarrays to accomplish highly sensitive solid-phase protein analysis. The efficiency of developed microarrays was demonstrated using mouse IgG and goat anti-mouse IgG as a model affinity pair.

New platforms for 3-D microarrays: Synthesis of hydrophilic polymethacrylate monoliths using macromolecular porogens

AbstractHydrophilic macroporous monolithic material based on poly(glycidyl methacrylate-co-glycerol dimethacrylate) was synthesized by photo-initiated free-radical polymerization. Different pore-forming agents, including low molecular mass cyclohexanol and dodecanol, as well as the solutions of hydrophobic polymers, namely, polystyrene in toluene and poly(dimethyl siloxane) in hexane, were used to obtain the macroporous polymer platforms intended for new type of 3-D microarrays (biochips). The porous characteristics of functional copolymers obtained were investigated by mercury intrusion porosimetry and scanning electron microscopy. Some of developed materials were tested for protein microarray construction. Demonstration of potential of suggested materials, as well as optimization of protein covalent immobilization conditions, were realized using model mouse IgG – goat anti-mouse IgG affinity pair.

Self-assembled spin-labeled nanoparticles based on poly(amino acids)

AbstractThe development of detectable nanoparticles for controlled drug delivery systems has tremendous practical importance regarding the monitoring of drug pathway in organism. Self-assembly amphiphilic block-copolymer poly(l-glutamic acid)-b-poly(l-phenylalanine) (pGlu-b-pPhe) was chosen for the preparation of discussed nanoparticles. The synthesis of blocks was carried out using ring-opening polymerization (ROP) of N-carboxyanhydrides of mentioned amino acids. To introduce the spin label at C-terminal position of hydrophilic block, (4-amino-2,2,6,6-tetramethylpiperidin-1-yl)oxyl (4-amino-TEMPO) was applied as ROP initiator and the polymerization of hydrophobic block was carried out with previously synthesized macroinitiator. The results obtained by transmission electron microscopy clearly showed that TEMPO-pGlu-b-pPhe polymer was really capable to self-assembling in aqueous solutions followed by polymersome formation. The mean size of nanoparticles was increased in a range of TEMPO-pGlu43-b-pPhe12 < TEMPO-pGlu43-b-pPhe29 < TEMPO-pGlu43-b-pPhe49 as 60 < 200 < 280 nm, respectively. EPR spectroscopy of the solutions of spin-labeled homopolymer TEMPO-p-γ-Glu(Bzl), block copolymers TEMPO-p-γ-Glu(Bzl)-b-pPhe and suspension of polymersomes formed from TEMPO-p-Glu-b-pPhe was performed and the results were compared. It was proved that in the case of nanoparticles EPR detectable spin labels are located on polymersome surface. The experiments in cell culture demonstrated the absence of cytotoxicity of labeled nanoparticles. Additionally, it was shown that TEMPO-label can be detected inside the cell by EPR method.

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