Scholarlink

<p>The behavior of Na-carboxymethyl ether of chitin/chitosan (weak polyampholyte)—poly-N-acetyl-D-glucose-2-amine derivative—was studied in dilute solutions using a set of hydrodynamic methods (sedimentation velocity, translational diffusion, viscous flow of dilute solutions) in a wide range of ionic strengths from approximately 10<sup>−6</sup> to 4.5&#xa0;M NaCl. The molar masses and scaling relationships (Kuhn–Mark–Houwink–Sakurada equations) were determined in 0.2&#xa0;M NaCl, where polyelectrolyte effects are virtually suppressed. The Kuhn segment length (persistent length) of chitin/chitosan Na-carboxymethyl ether chains in 0.2&#xa0;M NaCl was estimated using the Multi-HYDFIT suite (A. Ortega et. al., 2011 Methods 54, 115–123. <a href="https://doi.org/10.1016/j.ymeth.2010.12.004">https://doi.org/10.1016/j.ymeth.2010.12.004</a>), which is a method for computer processing of an array of experimental data obtained in a series of independent experiments. As a result, the following estimates were obtained: Kuhn segment length <i>A</i> = 24 ± 4&#xa0;nm, hydrodynamic chain diameter <i>d</i> = 1.7 ± 0.7&#xa0;nm. For the first time, using a method proposed earlier (G. M. Pavlov et al., 2006 Rus. J. Appl. Chem., 79(9), 1407–1412. <a href="https://doi.org/10.1134/s1070427206090035">https://doi.org/10.1134/s1070427206090035</a>), intrinsic viscosity of Na-carboxymethyl ether of chitin/chitosan in salt-free solutions, where most strong polyelectrolyte effects were demonstrated, was estimated. Viscometric data were interpreted using the persistent cylinder theory (Yamakawa-Fujii), which led to an estimate of the equilibrium rigidity <i>A</i> ≥ 500<i>&#xa0;nm</i>. This estimate is discussed within the framework of modern theories of polyelectrolyte linear chains.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hydrodynamic and equilibrium properties of sodium chitin/chitosan carboxymethyl ether macromolecules in dilute aqueous solution of different ionic strength

  • 期刊论文

  • 发表日期：

    2025年6月26日

查看全文
  • Olga Dommes,
  • Olga Okatova,
  • Anna Gosteva,
  • Georges M. Pavlov

摘要

The behavior of Na-carboxymethyl ether of chitin/chitosan (weak polyampholyte)—poly-N-acetyl-D-glucose-2-amine derivative—was studied in dilute solutions using a set of hydrodynamic methods (sedimentation velocity, translational diffusion, viscous flow of dilute solutions) in a wide range of ionic strengths from approximately 10−6 to 4.5 M NaCl. The molar masses and scaling relationships (Kuhn–Mark–Houwink–Sakurada equations) were determined in 0.2 M NaCl, where polyelectrolyte effects are virtually suppressed. The Kuhn segment length (persistent length) of chitin/chitosan Na-carboxymethyl ether chains in 0.2 M NaCl was estimated using the Multi-HYDFIT suite (A. Ortega et. al., 2011 Methods 54, 115–123. https://doi.org/10.1016/j.ymeth.2010.12.004), which is a method for computer processing of an array of experimental data obtained in a series of independent experiments. As a result, the following estimates were obtained: Kuhn segment length A = 24 ± 4 nm, hydrodynamic chain diameter d = 1.7 ± 0.7 nm. For the first time, using a method proposed earlier (G. M. Pavlov et al., 2006 Rus. J. Appl. Chem., 79(9), 1407–1412. https://doi.org/10.1134/s1070427206090035), intrinsic viscosity of Na-carboxymethyl ether of chitin/chitosan in salt-free solutions, where most strong polyelectrolyte effects were demonstrated, was estimated. Viscometric data were interpreted using the persistent cylinder theory (Yamakawa-Fujii), which led to an estimate of the equilibrium rigidity A ≥ 500 nm. This estimate is discussed within the framework of modern theories of polyelectrolyte linear chains.

Graphical Abstract