Fine chemical synthesis processes for antibiotics such as
ß-lactam is a major challenge for industrial implementation.
Significant advancement has also been made in the resolution
of racemic mixtures by means of stereo-selective acylation/
hydrolysis using ß-lactam acylases [83]. Enzymatic production
of cephalexin using immobilized penicillinGacylase has also
been studied in detail [83]. Conversion of 7-amino-3-deacetoxy
cephalosporanic acid to cephalexin by immobilized peincillin
G acylase has been investigated with an 85% conversion yield