Conducted a slightlymodified colorimetric assay for detecting pectinase and cellulase activity using 3,5-dinitrosalicylic acid (DNS) as the reagent and 1% soluble pectin and carboxymethyl cellulose (CMC) as substrates.
Incubated ten microliters of enzyme extract with 85 μL buffer and 15 μL soluble pectin and CMC for 60 min at 45 °C.
Stopped the reaction by adding 60 μL DNS and heating in boiling water for 10 min.
Measured the absorbance finally at 540 nm.
Conducted the experiment in three replicates.