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    Wyświetlanie 1-5 z 5
    Tytuł:
    Krytyczne stężenie micelarne i metody jego wyznaczania
    Critical micellar concentration and methods of its determination
    Autorzy:
    Piotrowska-Kirschling, A.
    Drzeżdżon, J.
    Chmurzyński, L.
    Jacewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/172267.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki powierzchniowo czynne
    surfaktanty
    krytyczne stężenie micelarne
    micele
    surface active compounds
    surfactants
    critical micellar concentration
    micelles
    Opis:
    Surfactants are substances, which have surface activity in aqueous solutions [1–3]. By adsorbing on the surface (boundary of phase separation) of the system, they change the surfactant properties of the liquid. Surfactants consist of a hydrophobic part (non-polar, called “tail”) and a hydrophilic part (polar, called “head”) [1–3]. The overall structure of the surfactant molecule is shown in Figure 1. In aqueous solution after exceeding one critical micellar concentration of the CMC surfatant (Critical Micelle Concentration), the surfactant molecules aggregate to form micelles [1–5]. Knowledge of CMC values and the micelle formation in solution, it determines the properties of surfactants and their subsequent use in the chemical industry. Surfactants are used in the chemical industry, inter alia, for the production of many detergents, cosmetics, paints, dyes, agrochemicals, pharmaceuticals, food or oil [2, 3].
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 11-12; 815-828
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybrane właściwości fizykochemiczne polikarboksylanowych związków kompleksowych kobaltu(II), niklu(II), miedzi(II) i oksowanadu(IV)
    Selected physicochemical properties of polycarboxylate cobalt(II), nickel(II), copper(II) and oxidovanadium(IV) complex compounds
    Autorzy:
    Piotrowska-Kirschling, A.
    Drzeżdżon, J.
    Chmurzyński, L.
    Jacewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/171735.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    polikarboksylanowe związki kompleksowe
    kinetyka
    metoda stopped-flow
    właściwości antyoksydacyjne
    woltamperometria cykliczna
    polycarboxylate complexes
    kinetics
    stopped-flow method
    antioxidant activity
    cyclic voltammetry
    Opis:
    Cobalt(II), nickel(II), copper(II) and oxidovanadium(IV) cations are coordination centers in many polycarboxylate complexes [1‒16]. A number of coordination compounds of transition metal ions with such ligands as polycarboxylate anions and heterocyclic organic ligands, e.g. 1,10-phenanthroline (phen) or 2,2’-bipyridine (bipy) have been examined for their biological properties [3‒16]. Their selected structures and physicochemical properties have been described in the first chapter. The polycarboxylate coordination compounds of cobalt(II), nickel(II), copper(II) and oxidovanadium(IV) have interesting antioxidant, antibacterial and antifungal activities. The antioxidant properties of polycarboxylate complexes of Co(II), Ni(II), Cu(II) and VO(IV) with 4-picoline, 1,10-phenanhroline and 2,2’-bipyridine have been investigated towards the superoxide anion radical using the nitro blue tetrazolium chloride (NBT) test and the cyclic voltammetry (CV). Their antibacterial and antifungal activities have been tested against bacteria and fungus strains that are antagonistic to the human. The determined biological properties of the oxydiacetate Co(II), Ni(II), VO(IV) complexes with bipy/phen, the thiodiacetate VO(IV) and the iminodiacetate Cu(II) complexes have been compared with these of L-ascorbic acid, which is chemical compounds commonly used as the reference antioxidant substance. Consequently, the comparison of antioxidant properties of selected cobalt( II), nickel(II), copper(II) and oxidovanadium(IV) polycarboxylate compounds is described in this work (Section 3, Tab. 1‒4). The kinetics of substitution reactions of selected copper(II) polycarboxylate complex compounds were monitored using the stopped-flow method in various reaction conditions (concentration of complex, temperature, solvent) (Rys. 5‒6) [5, 6]. The obtained results of the kinetic studies of the substitution reactions of [Cu(tda)]n with 2,2’-bipyridine in aqueous surfactants solvents: sodium dodecyl sulfate (SDSaq) and hexadecyl trimethyl- ammonium bromide (CTABaq) at 298.15 K (25 °C) are presented.
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 11-12; 797-814
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości antyoksydacyjne, antybakteryjne i przeciwgrzybicze związków kompleksowych miedzi(II)
    Antioxidant, antibacterial and antifungal properties of complex compounds of copper(II)
    Autorzy:
    Piotrowska, A.
    Drzeżdżon, J.
    Jacewicz, D.
    Chmurzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/171722.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki kompleksowe
    miedź(II)
    antyoksydanty
    aktywność antybakteryjna
    aktywność przeciwgrzybicza
    copper(II) complexes
    antioxidants
    antibacterial activity
    antifungal activity
    Opis:
    Since late 1930s copper has been recognized as an essential trace metal in living organisms. Copper(II) cation plays the role as a coordination center not only in the single-nuclear complexes, but also in the multinuclear coordination compounds with a particular emphasis on the polymers as ligands. The selected complex compounds of copper(II) with ligands which are organic and inorganic species have been characterized taking into account their physico-chemical properties. In addition, the complex compounds containing ligands such as Schiff ’s bases, hydrocarbons, organic bases, and also polycarboxylic anions: oxydiacetate, thiodiacetate, iminodiacetate and dipicolinate have been described considering their role in the biological systems. Nowadays tested coordination compounds of copper(II) have interesting antibacterial activities against bacteria strains that are antagonistic to the human. The antibacterial activity of copper(II) complex is stronger than some of the known antibacterial substances e.g. ciprofloxacin. In addition, copper(II) complex compounds exhibit a 64-fold greater antimicrobial properties than copper(II) chloride. Moreover, these compounds have antifungal and antioxidant properties. The activities of antibacterial, antifungal, and antioxidant complex compounds of copper( II) have been compared to the reactivities of these compounds with complexes used as reference substances, e.g. L-ascorbic acid, in the assay using nitrotetrazolium blue.
    Źródło:
    Wiadomości Chemiczne; 2017, 71, 3-4; 219-240
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probing of Cu2+ ions binding to A β (5−16) peptide using ITC measurements and MD simulations
    Autorzy:
    Makowska, J.
    Żmudzińska, W.
    Wyrzykowski, D.
    Brzozowski, K.
    Zblewska, H.
    Chmurzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938620.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    A β (5 − 16) fragments
    metal-peptide binding
    isothermal titration calorimetry
    molecular dynamics simulations
    Opis:
    It is shown that probably three residues: His6, His14 and His16 in the original sequence A β (1−42) serve as metal-binding sites for Cu2+ions. On the other hand, there is a possibility that only one of them plays a crucial role in the formation of the{A β (1-42)-Cu2+} complex. The isothermal titration calorimetry (ITC) measurements supported by molecular dynamic simulation (MD) with the NMR-derived restrains were used to investigate the interactions of Cu2+ with A β(5-16), a fragment of the A β(1-42) protein, with the following sequence: Ac-Arg-His-Asp-Ser-Gly-Tyr-Glu-Val-His-His-Gln-Lys-NH2, termed HZ1. The conditional thermodynamic parameters suggest that the formation of the Cu2+-HZ1 complex is both an enthalpy and entropy driven process under the experimental conditions. The studies presented here (after comparison with our previous results) show that the affinity of peptides to copper metal ions depends on two factors: the primary structure (amino acid composition) and the shape of the peptide conformation adopted.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 4; 409-416
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conformational analysis of fragment of human Pin1 ww domain: influence of charged amino-acid residues on β-hairpin structure
    Autorzy:
    Makowska, J.
    Uber, D.
    Żmudzińska, W.
    Chmurzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1935818.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska
    Tematy:
    peptide conformation
    β-hairpin
    hPin1 protein
    NMR
    Opis:
    We examined the effect of like-charged residues on the conformation of an original nine amino-acid-residue fragment of the human Pin1 WW domain (hPin1) with the following sequence: Ac-Arg-Met-Ser-Arg-Ser-Ser-Gly-Arg-Val-NH 2 (U9). This was facilitated by CD and NMR spectroscopic measurements, and molecular dynamics calculations. Our ear lier studies suggested that the presence of like-charged residues at the end of a short polypeptide chain composed of nonpolar residues could induce a chain reversal. For the U9 peptide, canonical MD simulations with NMR -derived restraints demonstrated the presence of ensembles of structures with a tendency to form a β -chain reversal. Additionally, thermal stabilities of the peptide under study were measured using differential scanning calorimetry ( DSC ). The estimated well defined phase transition point showed that conformational equilibria in the U9 peptide were strongly dependent on temperature.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 4; 343--349
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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