Quantification of cellulase by plate assay
The colony which was isolated from the soil sample that degraded
cellulose was compared with the commercial cellulase enzyme. Zone of
inhibition was analyzed at different concentration. Water agar medium
(0.2%) was prepared with 0.1% carboxyl methyl cellulose and was
sterilized at 121°C for 15 min. The sterilized whatman paper discs were
placed on water agar after saturating with different concentration of
standard enzymes and culture filtrates, and then they were incubated at
37°C for 24 h. After incubation period, grams iodine solution was added
for visualizing the zone of inhibition. The production of cellulase by
culture filtrates was quantified by a comparison of zone production and
standard enzyme.