Abstract
36 [90%] Serratia marcescens isolates were obtained out of 150 samples of soil, taken from different locations
in a farm in Babylon city. The isolate that produced chitinase in higher level was chosen to purify chitinase
through: ammonium sulfate precipitation. The purified chitinase has molecular weight 54000 Daltons by using
sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Chitinase showed stronger inhibitory
activity to Trichophyton rubrum, Alternaria alternate, Aspergillus fumigatus, Aspergillus niger, Aspergillus
flavus.