The reactions were performed in 7 cm3 SS-316 batch reactors.
The reactors, loaded with reactants and enzyme, were
pressurized to an initial pressure of 68 bar at room temperature,
wherein the density of carbon dioxide is 700 kg/m3. The
pressurized reactor was then immersed in water bath maintained
at the desired temperature (±0.5 ◦C). Depending on the
temperature investigated, the pressure of the reactor increased
to 75–100 bar. Since the volume of the reactor is constant, an
increase in the temperature of the system increases the pressure
of the system but the density of the supercritical fluid is
constant. The reactor was equipped with a pressure gauge to
ensure that the system operated at same pressure throughout
the reaction. The pressure in the reactor at all reaction conditions
was measured with an accuracy of ±1 bar. After the
desired reaction time, the reactors were depressurized and the
content was eluted in 3 cm3 methanol. The enzyme was settled
by centrifugation and the reaction mixture was analyzed
by HPLC.