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    Tytuł:
    Czy wkoło nas wyrośnie nanorurkowy las?
    Will a nanotube forest grow around us?
    Autorzy:
    Terzyk, A.P.
    Kruszka, B.
    Wiśniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/171853.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    las nanorurek węglowych
    metoda CVD w obecności pary wodnej
    Super Wzrost CVD
    nanorurka węglowa
    carbon nanotube forest
    water-assisted CVD method
    Super Growth CVD
    CNT
    Opis:
    In this study we describe the methods of preparation of a new class of carbon nanotubes i.e. pure and highly organized materials: carbon nanotube forests [3, 5]. High yield of this new method is caused by an increase in catalytic activity and life of used catalysts mainly due to an addition of steam to the reaction. The assistance of steam during the synthesis (the method is called "Super Growth Chemical Vapor Deposition"[3, 5]) leads to SWNTs forests having the height up to 4.0 mm. Such result is 100 times better in terms of efficiency than the previously reported records. Such synthesized, aligned materials are extremely high, super-highly dense and vertical-standing [Figs 2–4]. Moreover, this method leads to the purest SWNT material (over 99.98%) ever made. SWNTs are very easily separable from the catalysts and could be used without further purification. Highly efficient growth of SWNTs and DWNTs forests on conducting metal foils is also discussed. It is shown that such foils made of Ni-based alloys with Cr or Fe are excellent materials for the synthesis [3, 5, Fig. 3]. Under conditions where steam is added predominantly SWNTs (having the diameter 2.8 nm) are formed. Synthesis with an addition of oxygencontaining aromatics as growth enhancers is also described [figs. 16,17]. These enhancers caused the grow of CNTs having different diameters and wall numbers under identical reaction conditions. Creation of double-walled carbon nanotubes with populations as high as 84% and with the average size of 5.4 nm is possible with an insertion of methyl-benzoate. The creation of multi-walled CNTs is possible with an addition of benzaldehyde [9, Fig. 16].
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 1-2; 111-134
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemiczne aspekty celowanej terapii przeciwnowotworowej I. Kowalencyjne połączenia ligand-nośnik
    Chemical as pects of targeted anticancer therapy I. Covalent bond of ligand to carier
    Autorzy:
    Werengowska, K. M.
    Wiśniewski, M.
    Terzyk, A.P.
    Gurtowska, N.
    Drewa, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171972.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    nanonośniki leków
    terapia celowana
    ligandy
    wiązania kowalencyjne
    system dostarczania leków przeciwnowotworowych
    nanocarriers of drugs
    targeted therapy
    ligands
    covalent bond
    anticancer drug delivery system
    Opis:
    In this study we describe the most popular biomedical engineering nanoparticles including carbon nanotubes [17-20], liposomes [4-7], polymeric micells [11-13], quantum dots [3, 21-23], hydrogels [24-27], dendrimers [14-16] which are recently considered as modern drug carriers. These nanomaterials are applied for cancer diagnostic and targeted delivery of active compounds as chemotherapeutics in so called targeted therapy. Thus, we characterized the ideas of targeted therapy for which compositions of carriers with antibody are constructed (Figs. 3, 4). We also compared the traditional and targeted mechanisms [1, 3, 28-29] of drug delivery (Fig. 2). During targeted therapy only the essential dose of drug (less than during conventional chemotherapy) is delivering to the cancer cell. In additional, the application of targeted therapy reduces side effects, being very characteristic for the traditional treatment. The anticancer compound can selectively hits the target only, due to the presence of the ligands attached to the surface of nanocarirer. We characterized ligands which are often use in nanomedicine: antibodies [33-37], folic acid [30-33], peptides [33, 38, 39], aptamers [33, 40, 41] and transferrin [33, 42-44]. The purpose of this study is description of the bioconjugation of ligand-nanocarrier. This step is necessary and very important in synthesis of the novel drug delivery systems in targeted anticancer therapy. We report recent advances in the field showing the formation of amides (Figs. 6-8) [51-57], thioethers (Figs. 9-11) [52, 60-66], disulfides (Fig. 12) [69], and acethyl-hydrazone groups (Fig. 13) [73]. Special attention is paid to the process such as Diels-Alder (Figs. 14, 15) [74, 75] and "click chemistry" through the cycloaddition of Huisgen (Figs. 16, 17) [79-82]. We describe also the reaction of Staudinger [83] and the process of formation Schiff 's base [84]. The processes enable very mild and selective modification of the carriers through formation of amide bound. These methods ware less popular but allow the fictionalization of nanocarriers in biomedical application. Each reaction or process needs special and individual environment and conditions, which are summarized in Table 1.
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 9-10; 887-915
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemiczne aspekty celowanej terapii przeciwnowotworowej II. Połączenia nośnik -lek
    Chemical aspects of targeted anticancer therapy II . Bond of carrier to drug
    Autorzy:
    Werengowska, K. M.
    Wiśniewski, M.
    Terzyk, A.P.
    Gurtowska, N.
    Drewa, T. A.
    Olkowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/172570.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    nanonośniki leków
    leki przeciwnowotworowe
    wiązania kowalencyjne
    adsorpcja
    nanocarriers of drugs
    anticancer drugs
    covalent bonds
    adsorption
    Opis:
    Traditional anticancer therapy is usually low effective. Popular and common drugs applied in anticancer therapy are characterized by low solubility and nonspecific biodistribution in an organism. The chemotherapy kills not only cancer but also healthy cells [4]. Building of modern drug delivery systems based on nanocarriers is a new method of anticancer treatment. The present study is directed towards nanomaterials (as carbon nanotubes, liposomes, polymeric micelles) as modern drug carriers. Thus, we characterized mechanisms of actions of traditional chemotherapeutics: paclitaxel, cisplatin and doxorubicin (Figs. 3–5) [1, 15, 21]. The purpose of this study is a description of the bioconjugation of drug-nanocarrier. Chemotherapeutics can be connected to external or internal surfaces of nanocarriers (Fig. 6) [6]. We described two main methods of drug delivery from internal space of nanocarriers: nanoextraction and nanocondensation (Fig. 7) [32]. The type of drug-carrier bonding can be covalent or noncovalent. We report recent advances in the field showing the formation of esters (Figs. 10–11) [28, 29, 53, 54], acethylhydrazone (Fig. 12) [55–61], amides [62–64], and disulfides groups [12, 65]. These reactions depend on functional groups in structures of drugs and require suitable modification of nanocarrier surfaces. In practice, the functionalization of nanocarrier surface is associated with the covering with polymers including PE G, HPMA, PG and PL GA [3]. Adsorption is the most popular process of bonding chemotherapeutic and nanomaterials (Fig. 13) [66]. Special attention is paid to electrostatic interaction between drugs: paclitaxel [74], cisplatin [59, 76, 77], doxorubicin [67–73] and nanocarriers: carbon nanotubes and/or polymeric micells. By application of modern anticancer therapy, drugs are preserved from lysosomal degradation and to fast reaction in biological environment. Finally, nanocarriers improve adsorption of drug and increase concentration of drug only in cancer tissues [6, 7].
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 7-8; 637-670
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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