Process for preparing a biocatalyst with a polyvinyl alcohol and a highly mechanically stable biocatalyst with a polyvinyl alcohol produced by this process

摘要

Disclosed is process for preparing a biocatalyst with a biologically active material, in the form of microorganisms, enzymes, spores and/or cells introduced into a gel of polyvinyl alcohol produced by a process having the following steps: (a) use of an aqueous polyvinyl alcohol solution with a degree of hydrolysis /=98 % by moles, (b) admixture of an additive that is dissolved in the aqueous polyvinyl alcohol solution and forms a separate, finely distributed and aqueous phase after concentration of the solution whereby the additive is selected from the group formed by polyethylene glycol, cellulose esters, cellulose ethers, starch esters, starch ethers, polyalkylene glycol ethers, polyalkylene glycols, long-chain alkanoles (CnH2n+1OH with n 8), sugar esters and sugar ethers, (c) addition of the biologically active material d) drying of the aqueous solution to a residual water content of maximum 50 wt. % to cause the phases to separate and hence the polyvinyl alcohol to gel, (e) rehydrating the polyvinyl alcohol in an aqueous medium.