小中大剩余的抗体溶液中含有pH9.5的硼酸缓冲液,也含有硫酸铵,铵在碱性条件下容易分解产生氨,可能会干扰偶连,所以最好去干净或换缓冲液。
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该磁珠的说明书上写到:Addition of ammonium sulphate to a final concentration of 1.2M(1.0-1.5M) will increase the amount of antibody coupled to the beads,and can give an improved performance in some applications.我觉得可能是因为我用的这种磁珠表面是疏水性的,而加入少量的盐能使抗体的疏水区暴露,更有利于抗体与磁珠的结合。但是含硫酸铵的硼酸缓冲液每次开盖用的时候都能闻到刺鼻的味道,可能真的分解产生氨了。