AMPHOTERIC DISSOCIATION ION EXCHANGE MEDIUM, APPLICATION METHOD, AND SEPARATION CAPACITY CALIBRATION METHOD
申请人:Chongqing Bolanying (BLY) Biotechnology
Co., Ltd., China
公开号:EP3546066A1
公开(公告)日:2019-10-02
An amphoteric dissociation ion exchange medium. The surface of the amphoteric dissociation ion exchange medium is an amphoteric dissociation covalent modification layer. When an environmental pH value is lower than an isoelectric point of the amphoteric dissociation covalent modification layer, the surface net charge of the amphoteric dissociation covalent modification layer is positive, so that the amphoteric dissociation covalent modification layer has the property of anion exchanger; when the environmental pH value is higher than isoelectric point of the amphoteric dissociation covalent modification layer, the surface net charge of the amphoteric dissociation covalent modification layer is negative, so that the amphoteric dissociation covalent modification layer has the property of cation exchanger. The separation medium respectively has the property of the anion exchanger and the cation exchanger at the two sides of the isoelectric point, so that by adjusting the pH value of an eluant, the net charges on the surface of the separation medium and a target substance are same, so that a target substance can be released due to electrostatic repulsion, the elution effect is enhanced and subsequent problems due to application of high-concentration inorganic ions are avoided. The novel ion exchange medium has a high separation capacity, a high elution effect on the absorbed ions in a moderate condition, can accurately calibrate a separation capacity, has low non-specific adsorption to hydrophobic small molecules, and has a high regeneration effect in the moderate condition.
两性解离离子交换介质。两性解离离子交换介质的表面是两性解离共价修饰层。当环境 pH 值低于两性离解共价修饰层的等电点时,两性离解共价修饰层的表面净电荷为正,因此两性离解共价修饰层具有阴离子交换特性;当环境 pH 值高于两性解离共价改性层的等电点时,两性解离共价改性层的表面净电荷为负,使两性解离共价改性层具有阳离子交换特性。分离介质在等电点两侧分别具有阴离子交换剂和阳离子交换剂的性质,因此通过调节洗脱剂的 pH 值,分离介质表面的净电荷与目标物质的净电荷相同,这样目标物质就能因静电排斥而释放出来,洗脱效果增强,避免了后续因应用高浓度无机离子而产生的问题。新型离子交换介质具有高分离能力,在中等条件下对吸收的离子具有高洗脱效果,可准确校准分离能力,对疏水小分子的非特异性吸附低,在中等条件下具有高再生效果。