.5. Lysozyme activity
The activity of lysozyme was determined spectrophotometrically
at 660 nm by using a Shimadzu (Model
2450, Japan) spectrophotometer equipped with a constant
temperature cell holder working at 30 °C. The reaction
mixture was prepared by mixing 2.3 mL
M. lysodeikticus cell suspension (at 30 °C) prepared
0.26 mg/mL in 0.05 M, pH 7.0 Na-phosphate buVer and
0.2 mL enzyme solution (incubated at 30 °C for 5 min).
The reduction in absorbance was monitored for 5 min
and enzyme activity was calculated from the slope of the
initial linear portion of absorbance vs. time curve. The
enzyme activity was expressed as unit or percent initial
activity. One unit was 0.001 change in absorbance in
1 min.