Affinity adsorption mechanism studies of adsorbents C1-Zn(II) for uremic middle molecular peptides containing Asp-Phe-Leu-Ala-Glu sequence
作者:PingLin Li、LiXue Fu、YiTao Qiao、JianXin Zhao、Wei Wang、Zhi Yuan
DOI:10.1007/s11426-010-4193-7
日期:2011.2
To exploit efficient adsorbents for removing middle molecular peptides containing DFLAE (DE5, a typical peptide sequence accumulated in uremic serum) sequence by hemoperfusion, we designed and synthesized three affinity adsorbents (C1-Zn2+, C2-Zn2+ and C3-Zn2+) that could have high affinity to DE5. Subsequently, we evaluated the corresponding adsorption ability of each adsorbent by static adsorption experiments and isothermal titration calorimetry (ITC). The results showed that C1-Zn2+ had the best adsorption ability to DE5-containing peptides and the adsorption capacity for DE5 was 8.52 mg/g. By changing the adsorption conditions, the adsorption mechanism was elucidated. The main driving force of the adsorption is metal-carboxyl coordination and the hydrophobic force affords the cooperative effect. It is expected that our present work can provide basic understanding for the design of adsorbents with high affinity and selectivity towards oligopeptides.
为了利用高效的吸附剂去除含有DFLAE(DE5,一种典型的在尿毒症血清中积累的肽序列)序列的中分子肽,我们设计并合成了三种亲和力吸附剂(C1-Zn2+、C2-Zn2+ 和 C3-Zn2+),它们对DE5具有很高的亲和力。随后,我们通过静态吸附实验和等温滴定量热法(ITC)评估了每种吸附剂的相应吸附能力。结果显示,C1-Zn2+对含DE5的肽具有最佳的吸附能力,DE5的吸附能力为8.52 mg/g。通过改变吸附条件,阐明了吸附机制。吸附的主要驱动力是金属-羧酸协调作用,而疏水作用提供了协同效应。预计我们目前的研究工作能够为设计具有高亲和力和选择性的低聚肽吸附剂提供基础理解。