Magnetic Pigment

Abstract

Magnetic particles with an outer glass surface being essentially poreless or having pores of a diameter of less then 10 nm as well as ferromagnetic particles with a glass surface are preferentially useful for the isolation of biological material from samples. They provide a quick and reliable purification.

1 - 12 . (canceled) 
     
     
         13 . A method for separating a biological material from a fluid containing the biological material comprising:
 a) bringing a sample that contains the biological material in a fluid in contact with a magnetic particle, the magnetic particle comprising a magnetic core and an outer glass layer, said outer glass layer completely covers the magnetic core and does not contain boron oxide; and has an outer glass surface, under conditions such that the biological material binds to the glass surface; and thereafter   b) separating the bound biological material from the fluid.   
     
     
         14 . The method of  claim 13 , wherein said outer glass surface is pore-free. 
     
     
         15 . The method of  claim 13 , wherein said outer glass surface has pores with a diameter of less than 10 nm. 
     
     
         16 . The method of  claim 13 , wherein the bound biological material is separated from the fluid using a magnetic field. 
     
     
         17 . The method of  claim 13 , wherein the particle is not subjected to the influence of a magnetic field before being brought in contact with the sample and is thus able to sediment when brought in contact with the sample. 
     
     
         18 . The method of  claim 13 , further comprising eluting said bound nucleic acids from said magnetic particle.