The
transesterification
of
2o
-benzylglycerol
with
vinyl
acetate
has
been
studied
in
dichloromethane
using
free
and
immobilized
lipase
from
Pseudomonas
cepacia
with
particular
emphasis
on
the
effect
of
the
pertinent
variables
and
kinetic
aspects
of
the
reaction.
The
activity
of
the
immobilized
lipase
was
found
to
be
maximum
in
the
temperature
range
of
3050
°
C,
and
it
retained
about
one-third
of
the
initial
activity
up
to
the
third
cycle
after
repeated
use.
The
kinetics
of
the
reaction
was
analysed
by
the
so-called
Ping
Pong
Bi
Bi
mechanism,
and
the
model
parameters
were
estimated
by
nonlinear
regression
analysis
using
Marquard’s
technique.
The
immobilized
lipase,
which
had
the
activity
in
general,
3
times
greater
than
that
of
the
free
lipase
was
deactivated
by
both
temperature
and
vinyl
acetate.
The
deactivation
was
found
to
be
insignificant
up
to
a
certain
level
of
vinyl
acetate
concentration
above
which,
however
the
lipase
activity
fell
rapidly.
The
deactivation
kinetics
was
analysed
by
using
a
mathematical
model
which
accounts
for
a
series
type
of
reaction
mechanism
