CGTase was produced by inoculating Bacillus sp. C26 in 1 L of
Horikoshi II medium and incubating at 37 ◦C and 200 rpm for 48 h.
Cells and insoluble materials were removed by centrifugation at
4000 × g and 4 ◦C for 15 min. The cell-free supernatant was added
with ammonium sulfate (80% saturation) and left at 4 ◦C overnight
to precipitate the enzyme. The precipitated enzyme was dissolved
in 50 mM phosphate buffer, pH 7.0 and further purified using dialysis
bag with molecular weight cut-off 8000 Dalton. The activity of
the partially purified enzyme was determined by phenolphthalein
colorimetric method [18]. The protein concentration ofthe enzyme
was determined by Folin Ciocaltue method [19]. This partially puri-
fied CGTase was used in the further step. The total activity and
specific activity of crude enzyme were 1064 U and 15.59 U/mg,
respectively. After partial purification, a 27.9-fold purification was
achieved. The specific activity was increased up to 434.2 U/mg.