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Beta-lactamase was purified from local isolate of Acinetobacter baumannii by several steps included ion-exchange chromatography by using DEAE-Cellulose and gel filtration on Sephacryl S-200 column. The obtained purification fold and recovery were 11.72, 55.12% respectively. The characterization of the purified Beta-lactamase showed that the molecular weight was about 44, 668 KD as determined by gel filtration. The Acinetobacter baumannii gene (blaTEM) responsible for β-lactamases detection was by PCR. They recorded positive results reaching 39(86.66%), from the isolates.
β-Lactamase, Acinetobacter baumannii, Molecular weight, genotyping