76 strains of the family Enterobacteriaceae and Pseudomonadaceae were conserved by filter paper semistock method and 68 strains by Cryopreservation stock method in the bank of strains and genes of Biotechnology Institute of the Universidad Nacional de Colombia (IBUN). The effectiveness of methods was tested for the viability at 24 hours after preservation and was calculated the recovery percentage. Thus in conclusion, the preservation in paper filter and cryopreservation are suitable semistock and Stock methods, respectively; because 73.7% of family Enterobacteriaceae microorganisms and 82.3% of family Pseudomonadaceae microorganisms, presented a high recovery percentage greater 50%. In addition, was implemented a strain bank data base made in software Access ®, in Biotechnology Institute and Universidad Nacional de Colombia Web page www.ibun.unal.edu.co/instituto/cepario . It is available for general public.