2.2.3. Preparation of MPPM in powder and bead forms and their usage
in lipase immobilization
Powder form in a range of 4–8 mesh in size was prepared from
the monolithic polymer produced using medium values (Table 2).
Beads were synthesized by modification of the work of Desforges
et al., in which the initiator, potassium persulphate, was used in
polyglutaraldehyde solution (Desforges et al., 2002).
Immobilization of lipase was carried out by reaction of powder
or bead matrix (1 g) with enzyme (1 ml) in calcium acetate buffer(19 ml, 25 mM, pH 6) at 26 C for 25 h with gentle shaking
(250 rpm). The immobilized enzyme was then washed with acetate buffer (50 ml) to remove the unbound enzyme. The supernatant and washing solutions were assayed for unbound protein