Enzymatic conversion of benzylpenicillin to 6-aminopenicillanic acid in concentrated ultrafiltered broths

Benzylpenicillin filtered broths purified by ultrafiltration and fermented broths clarified by ultrafiltration and afterwards concentrated by reverse osmosis were used directly for enzymatic conversion of benzylpenicillin to 6-aminopenicillanic acid and phenylacetic acid by immobilised penicillin G acylase or amidase. It was concluded that, when the ultrafiltration operati on retained 100% of protein, the concentrates from reverse osmosis could be successfully directly fed to the enzymatic reactor, giving high enzymatic conversion yield of benzylpenicillin to 6-aminopenicillanic acid.