Particles having a magnetic core and outer glass layer for separating biological material
    6.
    发明授权
    Particles having a magnetic core and outer glass layer for separating biological material 失效
    具有用于分离生物材料的磁芯和外部玻璃层的颗粒

    公开(公告)号:US06255477B1

    公开(公告)日:2001-07-03

    申请号:US08952969

    申请日:1998-03-11

    IPC分类号: C12N1500

    摘要: Magnetic glass particles are prepared containing a magnetic core coated with a glass layer having a substantially pore-free glass surface. The particles are used for separating biological material such as nucleic acids. A preferred process of preparing the particles is by forming a mixture of magnetic cores with a sol formed from an alcohol and a metal alkoxide, spray-drying the mixture to coat the cores with a layer of gelled sol, and heating the coated cores to obtain the magnetic glass particles. Preferably, the particles have an average particle size of less than 100 &mgr;m and any pores of the glass surface have a diameter of less than 10 nm. The magnetic core may be a composite material containing a mica core and magnetite particles immobilized on the mica core, and the glass layer may contain boron oxide. Magnetic core materials include magnetite (Fe3O4) and Fe2O3. In using the magnetic glass particles to separate a biological material, the particles are contacted with a fluid containing the biological material such that the biological material binds to the glass surface, and the bound biological material is separated from the fluid such as by using a magnetic field. Before applying a magnetic field, the magnetic particles may sediment when contacted with the biological material.

    摘要翻译: 制备磁性玻璃颗粒,其包含涂覆有具有基本无孔玻璃表面的玻璃层的磁芯。 颗粒用于分离生物材料如核酸。 制备颗粒的优选方法是通过用由醇和金属醇盐形成的溶胶形成磁芯的混合物,喷雾干燥混合物以用一层凝胶溶胶涂覆芯,并加热涂覆的芯以获得 磁性玻璃颗粒。 优选地,颗粒的平均粒度小于100μm,并且玻璃表面的任何孔具有小于10nm的直径。 磁芯可以是包含固定在云母芯上的云母芯和磁铁矿颗粒的复合材料,并且玻璃层可以含有氧化硼。 磁芯材料包括磁铁矿(Fe3O4)和Fe2O3。 在使用磁性玻璃颗粒分离生物材料时,颗粒与包含生物材料的流体接触,使得生物材料结合到玻璃表面,并且结合的生物材料与流体分离,例如通过使用磁性 领域。 在施加磁场之前,当与生物材料接触时,磁性颗粒可能沉淀。