Association Behavior of a Homopolymer Containing Choline Phosphonate Groups in Aqueous Solutions

2021 ◽  
Author(s):  
Thi Lien Nguyen ◽  
Masaru Mukai ◽  
Daiki Ihara ◽  
Atsushi Takahara ◽  
Shin-ichi Yusa
Keyword(s):  
Aqueous Solutions ◽  
Association Behavior

Surface Active and Association Behavior of Oxybutylene−Oxyethylene and Oxyethylene−Oxybutylene−Oxyethylene Copolymers in Aqueous Solutions

Langmuir ◽  
2003 ◽  
Vol 19 (11) ◽  
pp. 4597-4603 ◽  
Author(s):  
S. S. Soni ◽  
N. V. Sastry ◽  
John George ◽  
H. B. Bohidar
Keyword(s):  
Aqueous Solutions ◽  
Association Behavior ◽  
Surface Active

scholarly journals Controlling the cooperative self-assembly of graphene oxide quantum dots in aqueous solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57425-57432 ◽  
Author(s):  
Salman Hassanzadeh ◽  
Karin H. Adolfsson ◽  
Minna Hakkarainen
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Self Assembly ◽  
Association Behavior ◽  
Dilute Aqueous Solutions ◽  
Graphene Oxide Quantum Dots

The 3D supramolecular association behavior of the synthesized 2D graphene oxide quantum dots (GOQDs) could be smartly controlled in dilute aqueous solutions to tune their final properties.

Aggregation behavior of tetrakis(N, N′, N″, N‴-tetramethyl tetra-2,3-pyridino)porphyrazine copper(II) and its interaction with ct-DNA: a thermodynamic approach

2010 ◽  
Vol 14 (04) ◽  
pp. 354-360
Author(s):  
Hamid Dezhampanah ◽  
A. Khalegh Bordbar ◽  
Zaynab Salimian ◽  
Elham Safaei
Keyword(s):  
Optical Absorption ◽  
Aqueous Solutions ◽  
Driving Forces ◽  
Hydrophobic Interactions ◽  
Binding Mode ◽  
Resonance Light Scattering ◽  
Groove Binding ◽  
Association Behavior ◽  
Hoff Equation ◽  
Thermal Melting

The association behavior of tetrakis( N , N ′, N ″, N ‴-tetramethyl tetra-2,3-pyridino)porphyrazine copper(II) ([ Cu(II) 2,3- tmtppa ]4+) was investigated in aqueous solutions at 25 °C and various ionic strengths using optical absorption and resonance light scattering (RLS) spectroscopies. The results show that ([ Cu(II) 2,3- tmtppa ]4+) does not have any affinity for aggregation due to increasing of salt concentration and exists as monomers even in homogeneous aqueous solutions of high ionic strengths (more than 1 M NaCl ). Interaction of ([ Cu(II) 2,3- tmtppa ]4+) with calf thymus DNA has also been studied in 1 mM aqueous phosphate buffer of pH 7.0, by optical absorption and RLS spectroscopies, and thermal denaturation experiments. The appearance of hypochromicity of less than 10% and bathochromicity shift of Δλ ≤ 2 nm in UV-vis spectra of ([ Cu(II) 2,3- tmtppa ]4+), increasing of thermal melting point of DNA, and no change in RLS spectra of porphyrazine due to interaction with DNA, represent the minor outside groove binding mode without any stack aggregate formation. The thermodynamic of the binding of ([ Cu(II) 2,3- tmtppa ]4+)-DNA also has been studied. The binding constant (K) was obtained by analysis of the optical absorption spectra of the complex at various DNA concentrations using SQUAD software. The value of K was estimated to be 2.34 × 105 ± 0.06 M -1 at 25 °C. The thermodynamic parameters were calculated by van't Hoff equation. The enthalpy and entropy changes were 41.83 ± 3.28 kJ/mol and 242.08 ± 9.88 J/mol.K at 25 °C, respectively. The results indicate that the process is entropy-driven and suggest that hydrophobic interactions are the main driving forces for the complex formation. Increasing of the ionic strength due to addition of NaCl destabilized porphyrazine-DNA complexes, indicating the competition of Na + ions with porphyrazine complexes for occupation of minor groove binding sites.

Effect of pH on the association behavior in aqueous solutions of pig gastric mucin

2008 ◽  
Vol 343 (2) ◽  
pp. 328-340 ◽  
Author(s):  
Atoosa Maleki ◽  
Géraldine Lafitte ◽  
Anna-Lena Kjøniksen ◽  
Krister Thuresson ◽  
Bo Nyström
Keyword(s):  
Aqueous Solutions ◽  
Gastric Mucin ◽  
Effect Of Ph ◽  
Association Behavior

Effects of salt on solute association behavior in nanoconfined aqueous solutions

2019 ◽  
Vol 383 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Liang Zhao ◽  
Mang Chen ◽  
Xian Wang ◽  
Jinge Yang ◽  
Zhimin Shi ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Association Behavior

scholarly journals Self-Association Behavior of Cell Membrane-Inspired Amphiphilic Random Copolymers in Water

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 327 ◽  
Author(s):  
Maho Ohshio ◽  
Kazuhiko Ishihara ◽  
Shin-ichi Yusa
Keyword(s):  
Aqueous Solutions ◽  
Fluorescence Probe ◽  
Nmr Relaxation ◽  
Radical Copolymerization ◽  
Degree Of Polymerization ◽  
Water Soluble ◽  
Random Copolymers ◽  
Free Radical Copolymerization ◽  
Association Behavior ◽  
Self Association

Water-soluble and amphiphilic random copolymers (P(MPC/DMAx)) composed of hydrophilic 2-methacryloyloxyethyl phosphorylcholine (MPC) and hydrophobic n-dodecyl methacrylate (DMA) were prepared via reversible addition-fragmentation chain transfer (RAFT) controlled radical polymerization. The compositions of DMA unit (x) in the copolymer were in the range of 0 to 38 unit mol %. The degree of polymerization of P(MPC/DMAx) was adjusted to about 200. Since the monomer reactivity ratios of MPC and DMA are 1.01 and 1.00, respectively, ideal free radical copolymerization occurred. In aqueous solutions, interpolymer aggregation occurred due to the hydrophobic pendant n-dodecyl groups. The aggregation number (Nagg) increased with an increasing x. The mobilities of the DMA and MPC pendant groups in aqueous solutions were restricted, as confirmed by 1H NMR relaxation time measurements, because a part of the MPC units were trapped in the hydrophobic microdomain formed from the pendant n-dodecyl groups. The polarity of the hydrophobic microdomain formed from P(MPC/DMA38) in water was similar to that of ethyl acetate according to fluorescence probe experiments. No specific interactions were found in water between P(MPC/DMAx) and bovine serum albumin because the surface of the interpolymer aggregates contained only hydrophilic MPC units.

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