The latent ampholytic nature of glycosaminoglycan (GAG) oligosaccharides facilitates their separation by isoelectric focusing

The latent ampholytic nature of glycosaminoglycan (GAG) oligosaccharides facilitates their separation by isoelectric focusing
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糖胺聚糖 (GAG) 寡糖的潜在两性本质有利于通过等电聚焦进行分离

DOI:
10.1039/c0ay00340a
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发表时间:
2010
期刊:
影响因子:
3.1
通讯作者:
Holman J
Holman J
中科院分区:
化学3区
文献类型:
--
作者:
Holman J

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糖胺聚糖是医学和生物学上重要的多糖。糖胺聚糖寡糖具有越来越大的药物相关性,但是,来自两种特别是硫酸乙酰肝素和肝素的寡糖由于其结构复杂性而难以分离。这阻碍了进一步的进展,因为很难获得足够数量的纯铋。肝素和硫酸乙酰肝素的两性性质是通过可逆的脱N-硫酸化或脱N-乙酰化来实现的,以显示游离胺基,从而提供了使用等电聚焦分离它们的机会。两性硫酸乙酰肝素和肝素钙的特征在于低pI值,等电聚焦需要能够支持pH 2以下的pH梯度的定制聚丙烯酰胺凝胶。肝素和化学改性肝素的代表性寡糖池(先前已通过高效阴离子交换色谱法和凝胶渗透色谱法分级分离至最佳电流水平)进一步分离并集中。等电聚焦法为糖胺聚糖寡糖提供了一个额外的分离维度,并对相关半制备技术的未来发展产生了影响。
Glycosaminoglycans are medically and biologically important polysaccharides. Glycosaminoglycan oligosaccharides are of increasing pharmaceutical relevance but, oligosaccharides from two in particular, heparan sulfate and heparin, are difficult to separate owing to their structural complexity. This hinders further progress because it is difficult to obtain pure saccharides in sufficient quantities. The ampholytic nature of heparin and heparan sulfate is realised by reversible de-N-sulfation or de-N-acetylation to reveal free amine groups, providing an opportunity to separate them using isoelectric focusing. Ampholytic heparan sulfate and heparin saccharides are characterised by low pI values, and isoelectric focusing required bespoke polyacrylamide gels capable of supporting pH gradients below pH 2. Representative oligosaccharide pools from heparin and chemically modified heparin, which had been fractionated previously to the best current levels by high performance anion exchange chromatography and gel permeation chromatography, were further separated and focused. The isoelectric focusing method provides an additional separation dimension for glycosaminoglycan oligosaccharides and has implications for the future development of related semi-preparative techniques.
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