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  1. Article: The Simultaneous Voltammetric Determination of Aflatoxins В

    Slepchenko, G B / Gindullina, T M / Gavrilova, M A / Auelbekova, A Zh

    Journal of analytical methods in chemistry

    2018  Volume 2018, Page(s) 6285623

    Abstract: For the first time, the possibility of using stripping voltammetry for the simultaneous determination of aflatoxins ... ...

    Abstract For the first time, the possibility of using stripping voltammetry for the simultaneous determination of aflatoxins В
    Language English
    Publishing date 2018-05-09
    Publishing country Egypt
    Document type Journal Article
    ZDB-ID 2654178-6
    ISSN 2090-8873 ; 2090-8865
    ISSN (online) 2090-8873
    ISSN 2090-8865
    DOI 10.1155/2018/6285623
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  2. Article: The Simultaneous Voltammetric Determination of Aflatoxins В1 and М1 on a Glassy-Carbon Electrode

    Slepchenko, G. B / Gindullina, T. M / Gavrilova, M. A / Auelbekova, A. Zh

    Journal of Analytical Methods in Chemistry (Online). 2018 May 9, v. 2018

    2018  

    Abstract: For the first time, the possibility of using stripping voltammetry for the simultaneous determination of aflatoxins В1 and М1 on a glassy-carbon electrode has been shown. The influence of various factors (Еэ, τэ, w, and the nature of the background ... ...

    Abstract For the first time, the possibility of using stripping voltammetry for the simultaneous determination of aflatoxins В1 and М1 on a glassy-carbon electrode has been shown. The influence of various factors (Еэ, τэ, w, and the nature of the background electrolyte) on the potential and magnitude of the oxidation current of mycotoxins has been estimated. Working conditions for voltammetric determination and reproducibility of analytical signals for two mycotoxins have been selected. The mutual influence of aflatoxins В1 and М1 on the value of analytical signals in their simultaneous presence has been studied. It has been found that, in the range of their detectable contents, the presence of aflatoxin В1 reduces the analytical signal of aflatoxin М1 by 45–50%, but the linearity of the calibration dependence is preserved. The content of aflatoxin М1 in determination of aflatoxin B1 does not exert a significant effect in the range of 10–15%. Based on the results obtained, a procedure has been proposed for determining the content of aflatoxins В1 and М1 in their joint presence in milk by voltammetry in the concentration ranges 2 × 10−3 ÷ 2 × 10−1 mg/dm3 and 2 × 10−4 ÷ 2 × 10−2 mg/dm3, respectively (Sr not more than 18%).
    Keywords aflatoxin B1 ; electrolytes ; glassy carbon electrode ; milk ; oxidation ; strontium ; working conditions
    Language English
    Dates of publication 2018-0509
    Publishing place Hindawi
    Document type Article
    ZDB-ID 2654178-6
    ISSN 2090-8873 ; 2090-8865
    ISSN (online) 2090-8873
    ISSN 2090-8865
    DOI 10.1155/2018/6285623
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  3. Article: Voltammetric Behavior, Identifying and Quantitatively Determining Iron-Based Nanoparticles, and Evaluating Their Stability in Simulated Solutions of Gastric Juice.

    Dubova, N M / Slepchenko, G B / Khlusov, I A / Ostapenko, M S / Nesterov, E A

    Journal of analytical methods in chemistry

    2018  Volume 2018, Page(s) 7319067

    Abstract: The electrochemical behavior of ... ...

    Abstract The electrochemical behavior of Fe
    Language English
    Publishing date 2018-08-01
    Publishing country Egypt
    Document type Journal Article
    ZDB-ID 2654178-6
    ISSN 2090-8873 ; 2090-8865
    ISSN (online) 2090-8873
    ISSN 2090-8865
    DOI 10.1155/2018/7319067
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  4. Article: Capabilities of the electrochemical methods in the determination of narcotic and psychotropic drugs in forensic chemistry materials

    Slepchenko, G. B / T. M. Gindullina / S. V. Nekhoroshev

    Journal of analytical chemistry. 2017 July, v. 72, no. 7

    2017  

    Abstract: A survey of the capabilities of electrochemical methods for the separation (capillary electrophoresis) and determination (amperometry, the versions of voltammetry, and potentiometry) of narcotic and psychotropic drugs and their metabolites, which are of ... ...

    Abstract A survey of the capabilities of electrochemical methods for the separation (capillary electrophoresis) and determination (amperometry, the versions of voltammetry, and potentiometry) of narcotic and psychotropic drugs and their metabolites, which are of interest in criminological practice, as the constituents of biological materials (hair, blood, and urine) and medicinal preparations is presented.
    Keywords blood ; capillary electrophoresis ; electrochemistry ; forensic sciences ; metabolites ; psychotropic agents ; surveys ; urine
    Language English
    Dates of publication 2017-07
    Size p. 703-709.
    Publishing place Pleiades Publishing
    Document type Article
    Note Review
    ZDB-ID 2057336-4
    ISSN 1608-3199 ; 1061-9348
    ISSN (online) 1608-3199
    ISSN 1061-9348
    DOI 10.1134/S1061934817070127
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  5. Article ; Online: The Simultaneous Voltammetric Determination of Aflatoxins В1 and М1 on a Glassy-Carbon Electrode

    G. B. Slepchenko / T. M. Gindullina / M. A. Gavrilova / A. Zh. Auelbekova

    Journal of Analytical Methods in Chemistry, Vol

    2018  Volume 2018

    Abstract: For the first time, the possibility of using stripping voltammetry for the simultaneous determination of aflatoxins В1 and М1 on a glassy-carbon electrode has been shown. The influence of various factors (Еэ, τэ, w, and the nature of the background ... ...

    Abstract For the first time, the possibility of using stripping voltammetry for the simultaneous determination of aflatoxins В1 and М1 on a glassy-carbon electrode has been shown. The influence of various factors (Еэ, τэ, w, and the nature of the background electrolyte) on the potential and magnitude of the oxidation current of mycotoxins has been estimated. Working conditions for voltammetric determination and reproducibility of analytical signals for two mycotoxins have been selected. The mutual influence of aflatoxins В1 and М1 on the value of analytical signals in their simultaneous presence has been studied. It has been found that, in the range of their detectable contents, the presence of aflatoxin В1 reduces the analytical signal of aflatoxin М1 by 45–50%, but the linearity of the calibration dependence is preserved. The content of aflatoxin М1 in determination of aflatoxin B1 does not exert a significant effect in the range of 10–15%. Based on the results obtained, a procedure has been proposed for determining the content of aflatoxins В1 and М1 in their joint presence in milk by voltammetry in the concentration ranges 2 × 10−3 ÷ 2 × 10−1 mg/dm3 and 2 × 10−4 ÷ 2 × 10−2 mg/dm3, respectively (Sr not more than 18%).
    Keywords Analytical chemistry ; QD71-142
    Language English
    Publishing date 2018-01-01T00:00:00Z
    Publisher Hindawi Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Voltammetric Behavior, Identifying and Quantitatively Determining Iron-Based Nanoparticles, and Evaluating Their Stability in Simulated Solutions of Gastric Juice

    N. M. Dubova / G. B. Slepchenko / I. A. Khlusov / M. S. Ostapenko / E. A. Nesterov

    Journal of Analytical Methods in Chemistry, Vol

    2018  Volume 2018

    Abstract: ... in the background electrolyte of 0.02 mole/dm3 Trilon B (pH 3.5) with the use of the CPE. Investigations ...

    Abstract The electrochemical behavior of Fe3O4 nanoparticles, iron nanoparticles coated with carbon, and diazonium salts by voltammetry methods using a carbon paste electrode (CPE) has been studied. There has been developed a voltammetric method for identifying and quantifying solid-phase iron-based nanoparticles in the background electrolyte of 0.02 mole/dm3 Trilon B (pH 3.5) with the use of the CPE. Investigations of nanoparticles’ stability with various coatings in a simulated solution of gastric juice have been carried out. Nanoparticles stability has been evaluated on the basis of determining Fe(III) ions in a simulated solution after contacting with nanoparticles within different periods of time using the method of inversion voltammetry. It has been shown that nanoparticles coated with carbon and salts of arendiazonium are the most resistant to aggressive media.
    Keywords Analytical chemistry ; QD71-142
    Subject code 620
    Language English
    Publishing date 2018-01-01T00:00:00Z
    Publisher Hindawi Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Voltammetric Behavior, Identifying and Quantitatively Determining Iron-Based Nanoparticles, and Evaluating Their Stability in Simulated Solutions of Gastric Juice

    Dubova, N. M / Slepchenko, G. B / Khlusov, I. A / Ostapenko, M. S / Nesterov, E. A

    Journal of Analytical Methods in Chemistry (Online). 2018 Aug. 1, v. 2018

    2018  

    Abstract: ... in the background electrolyte of 0.02 mole/dm3 Trilon B (pH 3.5) with the use of the CPE. Investigations ...

    Abstract The electrochemical behavior of Fe3O4 nanoparticles, iron nanoparticles coated with carbon, and diazonium salts by voltammetry methods using a carbon paste electrode (CPE) has been studied. There has been developed a voltammetric method for identifying and quantifying solid-phase iron-based nanoparticles in the background electrolyte of 0.02 mole/dm3 Trilon B (pH 3.5) with the use of the CPE. Investigations of nanoparticles’ stability with various coatings in a simulated solution of gastric juice have been carried out. Nanoparticles stability has been evaluated on the basis of determining Fe(III) ions in a simulated solution after contacting with nanoparticles within different periods of time using the method of inversion voltammetry. It has been shown that nanoparticles coated with carbon and salts of arendiazonium are the most resistant to aggressive media.
    Keywords carbon ; carbon electrodes ; coatings ; diazonium compounds ; electrochemistry ; gastric juice ; iron ; iron oxides ; nanoparticles ; pH ; salts
    Language English
    Dates of publication 2018-0801
    Publishing place Hindawi
    Document type Article
    ZDB-ID 2654178-6
    ISSN 2090-8873 ; 2090-8865
    ISSN (online) 2090-8873
    ISSN 2090-8865
    DOI 10.1155/2018/7319067
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Imbalance of morphofunctional responses of Jurkat T lymphoblasts at short-term culturing with relief zinc- or copper-containing calcium phosphate coating on titanium.

    Litvinova, L S / Shupletsova, V V / Dunets, N A / Khaziakhmatova, O G / Yurova, K A / Khlusova, M Yu / Slepchenko, G B / Cherempey, E G / Sharkeev, Yu P / Komarova, E G / Sedelnikova, M B / Khlusov, I A

    Doklady. Biochemistry and biophysics

    2017  Volume 472, Issue 1, Page(s) 35–39

    Abstract: Morphofunctional response of Jurkat T cells that were cultured for 24 h on substrates prepared from commercially pure titanium with relief microarc bilateral calcium phosphate coating containing copper or zinc was studied. Changes in the concentration of ...

    Abstract Morphofunctional response of Jurkat T cells that were cultured for 24 h on substrates prepared from commercially pure titanium with relief microarc bilateral calcium phosphate coating containing copper or zinc was studied. Changes in the concentration of essential trace elements contained in this coating can cause significant imbalance of molecular processes of differentiation, secretion, apoptosis, and necrosis and reduce tumor cell survival.
    MeSH term(s) Apoptosis/drug effects ; Calcium Phosphates/chemistry ; Cell Differentiation/drug effects ; Copper/chemistry ; Humans ; Jurkat Cells ; Secretory Pathway/drug effects ; Titanium/chemistry ; Trace Elements/chemistry ; Trace Elements/pharmacology ; Zinc/chemistry
    Chemical Substances Calcium Phosphates ; Trace Elements ; Copper (789U1901C5) ; calcium phosphate (97Z1WI3NDX) ; Titanium (D1JT611TNE) ; Zinc (J41CSQ7QDS)
    Language English
    Publishing date 2017-01
    Publishing country Russia (Federation)
    Document type Journal Article
    ZDB-ID 2062390-2
    ISSN 1608-3091 ; 1607-6729
    ISSN (online) 1608-3091
    ISSN 1607-6729
    DOI 10.1134/S1607672917010094
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  9. Article: Modeling of transcellular Ca transport in rat duodenum points to coexistence of two mechanisms of apical entry.

    Slepchenko, B M / Bronner, F

    American journal of physiology. Cell physiology

    2001  Volume 281, Issue 1, Page(s) C270–81

    Abstract: Employing realistic parameters, we have demonstrated that a relatively simple mathematical model can reproduce key features of steady-state Ca2+ transport with the assumption of two mechanisms of Ca2+ entry: a channel-like flux and a carrier-mediated ... ...

    Abstract Employing realistic parameters, we have demonstrated that a relatively simple mathematical model can reproduce key features of steady-state Ca2+ transport with the assumption of two mechanisms of Ca2+ entry: a channel-like flux and a carrier-mediated transport. At low luminal [Ca2+] (1-5 mM), facilitated entry dominates and saturates with Km = 0.4 mM. At luminal [Ca2+] of tens of millimolar, apical permeability is dominated by the channel flux that in turn is regulated by cytosolic Ca2+. The model reproduces the linear relationship between maximum Ca2+ transport rate and intestinal calbindin D9K (CaBP) content. At luminal [Ca2+] > 50 mM, local sensitivity analysis shows transcellular transport to be most sensitive to variations in CaBP. At low luminal [Ca2+], transport becomes sensitive to apical entry regulation. The simulations have been run within the Virtual Cell modeling environment, yielding the time course of external Ca2+ and spatiotemporal distributions of both intracellular Ca2+ and CaBP. Coexistence of two apical entry mechanisms accords with the properties of the duodenal Ca2+ transport protein CaT1 and the epithelial Ca2+ channel ECaC.
    MeSH term(s) Animals ; Calcium/metabolism ; Cell Polarity ; Duodenum/metabolism ; Ion Transport ; Models, Biological ; Rats ; Vitamin D/pharmacology
    Chemical Substances Vitamin D (1406-16-2) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2001-07
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 392098-7
    ISSN 1522-1563 ; 0363-6143
    ISSN (online) 1522-1563
    ISSN 0363-6143
    DOI 10.1152/ajpcell.2001.281.1.C270
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  10. Article: Cyclin aggregation and robustness of bio-switching.

    Slepchenko, Boris M / Terasaki, Mark

    Molecular biology of the cell

    2003  Volume 14, Issue 11, Page(s) 4695–4706

    Abstract: During the cell cycle, Cdc2-cyclin B kinase abruptly becomes active and triggers the entry ... into mitosis/meiosis. Recently, it was found that inactive Cdc2-cyclin B is present in aggregates in immature ... a possible scenario in which aggregation of Cdc2-cyclin B dramatically enhances robustness of this activation ...

    Abstract During the cell cycle, Cdc2-cyclin B kinase abruptly becomes active and triggers the entry into mitosis/meiosis. Recently, it was found that inactive Cdc2-cyclin B is present in aggregates in immature starfish oocytes and becomes disaggregated at the time of its activation during maturation. We discuss a possible scenario in which aggregation of Cdc2-cyclin B dramatically enhances robustness of this activation. In this scenario, only inactive Cdc2-cyclin B can form aggregates, and the aggregates are in equilibrium with inactive Cdc2-cyclin B in solution. During maturation, the hormone-triggered inactivation of Myt1 depletes the soluble inactive Cdc2-cyclin B and the turnover leads to dissolution of the aggregates. This phase change, when coupled with the instability of the signaling network, provides a robust bio-switch.
    MeSH term(s) Animals ; CDC2 Protein Kinase/metabolism ; Cyclin B/metabolism ; Meiosis ; Mitosis ; Models, Theoretical ; Oocytes/metabolism ; Signal Transduction ; Starfish/embryology ; Starfish/metabolism
    Chemical Substances Cyclin B ; CDC2 Protein Kinase (EC 2.7.11.22)
    Language English
    Publishing date 2003-11
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 1098979-1
    ISSN 1939-4586 ; 1059-1524
    ISSN (online) 1939-4586
    ISSN 1059-1524
    DOI 10.1091/mbc.E03-04-0248
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