Dna hybrids and environment cleaning system employing dna hybrids

Abstract

A DNA hybrid which comprises a porous oxide matrix and DNA immobilized thereon, and is useful for environmental clean-up, where the hybrid is prepared by removing a dispersion medium from a dispersion of colloidal oxide and DNA.

1 . A DNA hybrid comprising a porous oxide matrix and a DNA immobilized by the matrix, the DNA hybrid prepared by removing a dispersion medium from a dispersion of a colloidal oxide and DNA.  
   
   
       2 . The DNA hybrid according to  claim 1 , wherein the dispersion medium is removed by heating the dispersion at 25° C. to 200° C.  
   
   
       3 . The DNA hybrid according to  claim 1 , wherein the DNA content in the hybrid is 0.01 to 15% by mass.  
   
   
       4 . The DNA hybrid according to  claim 1  or  3 , wherein the colloidal oxide is a mixture of a colloidal silica and at least one colloidal oxide of a metal whose valence is 3 or 4.  
   
   
       5 . The DNA hybrid according to  claim 1 , wherein the oxide comprises at least one oxide selected from the group consisting of aluminum oxide, iron oxide, titanium oxide and zirconium oxide.  
   
   
       6 . A method for producing a DNA hybrid comprising the steps of: 
 preparing a dispersion comprising a colloidal oxide, a DNA and a dispersion medium; and,    removing the dispersion medium from the dispersion to immobilize the DNA in a porous matrix made of the oxide.    
   
   
       7 . The method according to  claim 6 , wherein the dispersion medium is removed by heating the dispersion at 25° C. to 200° C.  
   
   
       8 . The method according to  claim 6 , wherein the DNA content of the DNA hybrid is 0.01 to 15% by mass.  
   
   
       9 . The method for producing a DNA hybrid according to  claim 6  or  8 , wherein the colloidal oxide is a mixture of colloidal silica and at least one colloidal oxide of a metal whose valence is 3 or 4.  
   
   
       10 . The method according to  claim 9 , wherein the oxide comprises at least one oxide selected from the group consisting of aluminum oxide, iron oxide, titanium oxide and zirconium oxide.  
   
   
       11 . An environmental cleaning system for removing a harmful substance in water comprising a DNA hybrid according to  claim 1  and means for bringing the DNA hybrid into contact with a water containing a harmful substance.  
   
   
       12 . An environmental cleaning method by removing a harmful substance in a water comprising a step for bringing a DNA hybrid according to  claim 1  into contact with a water containing a harmful substance to adsorb the harmful substance by the DNA hybrid.