Cellulase and xylanase production by Candida
easanensis strain JK—8 was optimized following one factor at
a time (OFAT) approach. The effect of initial pH of medium
(3.5-6.0) and different carbon sources was tested. A medium
containing 1.0% different carbon source (CM-cellulose,
carboxymethyl cellulose (CMC), cellobiose and glucose) in
1.0% yeast extract and 0.5% peptone was used to detect
cellulase while Birchwood xylan, glucose and xylose were
used as a carbon source to detect xylanase. Each medium was
inoculated with overnight preculture with initial OD m at 0.1.
The cultures were grown under shaking with 130 rpm at
35"C. The cell free supernatant was measured for cellulase
and xylanase activity at 24 hr-intervals for seven days by
measuring the releasing of reducing sugar with the Somogyi-
Nelson method (Somogyi, 1952). The effect of different con-
centrations of carboxymethyl cellulose and xylan (05-15%)