带电和不带电Ficoll70溶液的动力学和复合物的形成
Dynamics and complex formation in charged and uncharged Ficoll70 solutions
摘要：
本文应用脉冲场梯度核磁共振（PFG NMR）技术测量了不带电和带电多糖（Ficoll70）在水中的平移扩散。数据的分析表明，NMR信号衰减超过一定的包装分数，可以充分地拟合与双指数函数。自扩散测量还表明，Ficoll 70是一种常用的紧凑、球形聚蔗糖分子，其本身并不理想，以由单体和簇组成的稳定悬浮液的形式表现出柔软性和吸引力相互作用的迹象。此外，我们可以量化的单体和集群的分数。这项工作加强了在多孔Ficoll 70颗粒内和周围存在结合水层的图片。
英文摘要：
We apply pulsed-field-gradient NMR (PFG NMR) technique to measure the translational diffusion for both uncharged and charged polysaccharide (Ficoll70) in water. Analysis of the data indicate that NMR signal attenuation above a certain packing fraction can be adequately fitted with a bi-exponential function. The self-diffusion measurements show also that the Ficoll70, an often-used compact, spherical polysucrose molecule, is itself non-ideal, exhibiting signs of both softness and attractive interactions in the form of a stable suspension consisting of monomers and clusters. Further, we can quantify the fraction of monomer and cluster. This work strengthens the picture of the existence of a bound water layer within and around a porous Ficoll70 particle.
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