- Rich spectroscopic and molecular dynamic studies on the interaction of cytotoxic Pt(II) and Pd(II) complexes of glycine derivatives with calf thymus DNA
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Some amino acid derivatives, such as R-glycine, have been synthesized together with their full spectroscopic characterization. The sodium salts of these bidentate amino acid ligands have been interacted with [M(bpy)(H2O)2](NO3)2 giving the corresponding some new complexes with formula [M(bpy)(R-gly)]NO3 (where M is Pt(II) or Pd(II), bpy is 2,2′-bipyridine and R-gly is butyl-, hexyl-and octyl-glycine). Due to less solubility of octyl derivatives, the biological activities of butyl and hexyl derivatives have been tested against chronic myelogenous leukemia cell line, K562. The interaction of these complexes with highly polymerized calf thymus DNA has been extensively studied by means of electronic absorption, fluorescence and other measurements. The experimental results suggest that these complexes positive cooperatively bind to DNA presumably via groove binding. Molecular dynamic results show that the DNA structure is largely maintained its native structure in hexylglycine derivative-water mixtures and at lower temperatures. The simulation data indicates that the more destabilizing effect of butylglycine is induced by preferential accumulation of these molecules around the DNA and due to their more negative free energy of binding via groove binding.
- Eslami Moghadam, Mahboube,Saidifar, Maryam,Divsalar, Adeleh,Mansouri-Torshizi, Hassan,Saboury, Ali Akbar,Farhangian, Hossein,Ghadamgahi, Maryam
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- Controlled polymerization of N-substituted glycine N-thiocarboxyanhydrides initiated by rare earth borohydrides toward hydrophilic and hydrophobic polypeptoids
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N-substituted glycine N-thiocarboxyanhydrides (NTAs) are alternative monomers to prepare polypeptoids with large-scale producing potential compared to the corresponding N-carboxyanhydrides (NCAs) due to their easily synthetic approach and stability during
- Tao, Xinfeng,Deng, Yangwei,Shen, Zhiquan,Ling, Jun
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p. 6173 - 6180
(2015/02/19)
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- Polypeptoids from n-substituted glycine n-carboxyanhydrides: Hydrophilic, hydrophobic, and amphiphilic polymers with poisson distribution
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Preparation of defined and functional polymers has been one of the hottest topics in polymer science and drug delivery in the recent decade. Also, research on (bio)degradable polymers gains more and more interest, in particular at the interface of these t
- Fetsch, Corinna,Grossmann, Arlett,Holz, Lisa,Nawroth, Jonas F.,Luxenhofer, Robert
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experimental part
p. 6746 - 6758
(2012/03/10)
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- Cyclic poly(α-peptoid)s and their block copolymers from N-heterocyclic carbene-mediated ring-opening polymerizations of N-substituted N-carboxylanhydrides
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(Chemical Equation Presented) N-Heterocyclic carbene (NHC)-mediated ring-opening polymerization (ROP) of N-substituted N-carboxylanhydride ( NR-NCA) yields cyclic poly(4-peptoid)s with controlled molecular weights (Mn = 3-30 kg mol-1) and narrow molecular weight distributions (PDI = 1.04-1.12). The reactions exhibit characteristics of a living polymerization with minimal chain transfer. This enables the facile synthesis of cyclic diblock copoly(4-peptoid)s through sequential monomer addition. The cyclic polymer architectures were verified by MALDI-TOF mass spectrometry and intrinsic viscosity measurements. Mark-Houwink-Sakurada plot analyses revealed that cyclic poly(4-peptoid)s prepared from NHC-mediated polymerizations exhibit lower intrinsic viscosities than their linear analogues prepared from primary amine-initiated polymerizations. The ratio of their intrinsic viscosities is consistent with the former being mostly cyclic.
- Li, Guo,Donghui, Zhang
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supporting information; experimental part
p. 18072 - 18074
(2010/03/25)
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- A mild and efficient method for the one-pot monocarboxymethylation of primary amines
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A mild and efficient method for the monocarboxymethylation of primary amines that takes place under aqueous conditions at room temperature is described. Treatment of an aqueous solution of a variety of primary amines with two equivalents of glyoxylic acid
- Gibbs, Timothy J. K.,Boomhoff, Michael,Tomkinson, Nicholas C. O.
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p. 1573 - 1576
(2008/02/04)
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