An IgG dipstick or other device is disclosed for the colourimetric detection of IgG in a sample in the presence of other proteins. The dipstick or other device comprises a porous ion exchange member 1, e.g. of ion exchange filter paper, into which the IgG containing sample is drawn by capillary attraction. The pH of the sample is adjusted to the isoelectric point of IgG, and due to the faster diffusion rate of IgG at its isoelectric point as compared with other proteins in the sample which have different isoelectric points, IgG is preferentially separated from the other proteins and its presence is detected by a band of protein reactive dye 2 incorporated into the porous ion exchange member at a predetermined distance from the point of application of the protein sample.
本发明公开了一种 IgG 滴管或其他装置,用于在有其他蛋白质存在的情况下对样品中的 IgG 进行比色检测。IgG检测棒或其他装置由多孔离子交换部件1(如离子交换滤纸)组成,含有IgG的样品通过毛细管吸力被吸入其中。样品的 pH 值调节到 IgG 的等电点,由于 IgG 在等电点的扩散速度快于样品中具有不同等电点的其他蛋白质,IgG 会优先从其他蛋白质中分离出来,并通过多孔离子交换构件中的蛋白质活性
染料 2 带在距离蛋白质样品应用点的预定距离上检测其存在。