4. Effect of NaCl concentration on bacterial
growth and lipase production
An inoculum was prepared by
transferring one loop of the selected strain into 25
ml SGC medium (pH 7.0) in 125 ml Erlenmeyer
flask. This was then incubated on a rotary shaker
at 37°C, 250 rpm for 18 hr. Later, 5 ml of this seed
culture was inoculated into 50 ml SGC medium
(pH 7.0), containing 1% of olive oil and various
concentrations of NaCl (0-4 M), in 250 ml
Erlenmeyer flask. Cultivation conditions were the
same as for the seed culture. About 3 ml of culture
broth was taken out every day and optical density
was measured at wavelength 660 nm by using a
spectrophotometer (UV-1201 Shimadzu, Japan).
After measurement, the culture broth was
centrifuged at 8,000 ×g, 5°C for 20 min and the
supernatant was used for determination of lipase
activity.