Protein fouling of modified microporous PET track-etched membranes

Korolkov, Ilya V.; Mashentseva, Anastassiya A.; Güven, Olgun; Gorin, Yevgeniy G.; Здоровец, М. В.

doi:10.1016/j.radphyschem.2018.06.007

Cited by 31 publications

(22 citation statements)

References 46 publications

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“…The CS of carbons of C=O groups are shielded in substituted imidazolinone rings in average up to 2.0 ppm (2a-e), and for compounds 2f, g with electron-acceptor substituents (-NO, -СОCН 3 ) the carbonyl signals shift to the high-field region by 8.9 ppm. The observed effect of strong shielding of the C=O group in compounds 2f, g is explained by the circulation of electron-acceptor substituents' electrons due to the presence of π-bonds, which leads to the appearance of a field additionally strengthening the external [23; 183] or «anisotropy cone» [24]. This effect is similar for 2,6-N-disubstituted compounds 5e-h and is shown in Figure 4.…”

Section: T a B L E 1 сHemical Shifts Of N-monosubstituted Glycolurilssupporting

confidence: 54%

“…Aminacid derivatives of fullerenes. The synthesis of water-soluble derivatives of C60 fullerene with sodium salts of aminobutyric and ε-aminocaproic acids, as well as hybrid structures based on the fullerene derivative with proline and carnosine (β-alanyl-L-histidine) are described [19][20][21][22][23]24]. The considered derivatives possessed antioxidant activity.…”

Section: Main Partmentioning

confidence: 99%

“…Substituting group 1 Н NMR, ppm, (J/Hz) 13 С NMR, ppm R 1 R 2 СН-СН NH СН-СН С=О 1 [19] 5. 24 [20] c-C 6 H 11 c-C 6 H 11 5.50 (s. 2H) -64.27 159.27 9b [20] (CH 2 ) 2 COOH (CH 2 ) 2 COOH 5.56 (s. 2H) -64.42 159.37 9c [20] CON Analysis of the CS of tricyclic pentaazabicyclo[5.3.1.0]undecane-1,5-diones 8a-c and tetracyclic hexahydrohexaazacyclopeite[def]fluoren-4,8-diones 9a-c made it possible to establish that these substances do not have significant differences in NMR signals for glycoluril scaffolds indicating the presence of polycyclicity and a rigid frame. It was found that the CS of CH-CH carbons in the 9c polycycle are shielded by 11 ppm, relative to 1, which is probably due to the additional shielding field, created by the π-group of NCON(CH 3 ) 2 .…”

Section: T a B L E 4 сHemical Shifts Of Symmetric 2 6-n-disubstitutementioning

confidence: 99%

“…There has been a significant amount of interest for track-etched membrane (TeMs) in MD. A unique feature of TeMs is the control of the number of pores per unit area [20][21][22][23][24][25], which significantly expands fields of application in sensing [26], catalysis [27][28][29][30][31], lithium-ion batteries [32,33], template synthesis of nanostructures [34][35][36][37][38]. At the present time various types of polymers are known, intended as a material for TeMs.…”

Section: Introductionmentioning

confidence: 99%

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2020

Bull. of the Kar. Univ. "Chem". Ser.

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The use of differential calculation methods for the destruction of copolymers of polyethylene glycol fumarate with the acrylic acid In this work, the thermal decomposition of copolymers based on polyethylene glycol fumarate with the acrylic acid using various ratios of initial monomers has been studied for the first time. The samples were studied in air and nitrogen. According to the thermograms analysis, it was found that the copolymer sample decomposition begins at higher temperatures for a copolymer with high content of polyester resin. The copolymer is vigorously oxidized by the oxygen when heated in air, and one can observe almost complete sample decomposition, whereas it decomposes with a residue of ~15 % in an inert medium. The activation energies for copolymers with different compositions were estimated using the differential methods of Freeman-Carroll, Achar and Sharpe-Wentworth. The activation energy values found by the three methods demonstrated a good convergence. It was shown that, the activation energy values are higher (~200 kJ/mol in the inert medium, and ~95 kJ/mol in the oxygen atmosphere) for a copolymer with a lower composition of polyester resin, and the activation energy is ~180 and ~85 kJ/mol for a copolymer with a greater composition of p-EGF-AA. The copolymer is more thermostable in the nitrogen atmosphere according to the kinetic parameters. Additionally, there were determined the thermodynamic characteristics, such as the Gibbs energy (∆G) and the entropy (∆S). They also confirm the destruction process dependence on the components ratio in the synthesized copolymer.

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Section: T a B L E 1 сHemical Shifts Of N-monosubstituted Glycolurilssupporting

confidence: 54%

Section: Main Partmentioning

confidence: 99%

Section: T a B L E 4 сHemical Shifts Of Symmetric 2 6-n-disubstitutementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Untitled

2020

Bull. of the Kar. Univ. "Chem". Ser.

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Section: Introductionmentioning

confidence: 99%

Phenol solutions treatment by using hydrophobized track-etched membranes

Yeszhanov¹,

Dosmagambetova²

2020

Bull. of the Kar. Univ. "Chem". Ser.

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Phenols are one of the most common surface water pollution. The discharge of phenolic waters into water bodies and streams sharply degrade their general sanitary condition, since these compounds have a toxic effect, and phenols can intensively absorb oxygen dissolved in water, which negatively affects the life of organisms in water bodies. Therefore, water treatment of phenols is an important environmental problem. In this study, the hydrophobic polyethylene terephthalate track-etched membranes (PET TeMs) were tested in water treatment from phenol by direct contact membrane distillation (DCMD). Hydrophobic PET TeMs were obtained by UV-graft polymerization of styrene, triethoxyvinylsilane with the addition of vinylimidazole (VIM), as well as by coating with fluorine-containing silanes. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy and liquid entry pressure (LEP) analysis were used for membrane characterization. The contact angle after modification of PET TeMs was reached more than 130°. The efficiency of water purification from phenol was evaluated by water-flux measurements and fluorimetric method. The phenols solution was used at a concentration of 0.5, 1 and 2 g/l. The largest permeate flux of hydrophobized membranes was 1.1 kg/ m2•h.

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Developing tardigrade‐inspired material: Track membranes functionalized with Dsup protein for cell‐free DNA isolation

Zarubin,

Andreev,

Kravchenko

et al. 2024

Biotechnology Progress

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When developing functionalized biomaterials, the proteins from extremophilic organisms, in particular unique tardigrade disordered proteins, are of great value. The damage suppressor protein (Dsup), initially discovered in the tardigrade Ramazzottius varieornatus and found to be an efficient DNA protector under oxidative and irradiation stress, has been hypothesized to possess a good potential for the development of the material, which can isolate cell‐free DNA. With this in mind, DNA‐nonadsorbing polyethylene terephthalate track membranes have been functionalized using the Dsup protein via covalent bonding with glutaraldehyde. The filtration experiments have verified the ability of track membranes with the immobilized Dsup protein to adsorb cell‐free DNA, with an accumulation capacity of 70 ± 19 mg m−2. The resulting track membrane‐based biomaterial might be used in various devices for filtration and separation of cell‐free DNA molecules from biological solutions and environmental samples, and also for their accumulation, storage, and further manipulation.

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Protein fouling of modified microporous PET track-etched membranes

Cited by 31 publications

References 46 publications

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Phenol solutions treatment by using hydrophobized track-etched membranes

Developing tardigrade‐inspired material: Track membranes functionalized with Dsup protein for cell‐free DNA isolation

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