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首页> 外文期刊>Journal of Biomolecular Structure and Dynamics >23Na NMR Study of the Interaction between Hyaluronan and the bications Ca(++), Mg(++) and Cu(++).
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23Na NMR Study of the Interaction between Hyaluronan and the bications Ca(++), Mg(++) and Cu(++).

机译:透明质酸与碳酸钙,镁(++)和铜(++)之间的相互作用的23Na NMR研究。

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摘要

The relaxation rate R = piDeltanu(1/2) of the quadrupolar (23)Na nucleus was measured at pH approximate, equals 7 using a 200 MHz NMR spectrometer with a view to observe the interaction between hyaluronan and its natural counterion Na(+) and the bications Ca(++), Mg(++) and Cu(++). An interpretation of our results, by means of the "entropy of fluctuations" concept of Na(+), is presented. We show that Cu(++) ions are more effective than Ca(++) and Mg(++). A possible model of complexation of Cu(++) in a cage formed by the 1-4 glycosidic bond, the carboxylate side-chain and the acetoamide side-chain is proposed, according to electrostatic potential computations using the ZINDO1 quantum semi empirical method.
机译:为了观察透明质酸与其天然抗衡离子Na(+)之间的相互作用,使用200 MHz NMR光谱仪在大约pH的条件下测量了四极(23)Na核的弛豫率R = piDeltanu(1/2),等于7。和碳酸钙Ca(++),Mg(++)和Cu(++)。通过Na(+)的“波动熵”概念,对我们的结果进行了解释。我们表明,Cu(++)离子比Ca(++)和Mg(++)更有效。根据使用ZINDO1量子半经验方法的静电势计算,提出了由1-4个糖苷键,羧酸盐侧链和乙酰胺侧链形成的笼中Cu(++)络合的可能模型。

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