Extracellular lipase production by Rhizopus arrhizus was increased by mutan
t selection from 130 to 670 mu mol FFA per mt per min using UV radiation an
d aziridine treatment. The produced lipase was purified 720-fold by ammoniu
m sulfate fractionation and Sephadex G-100 gel filtration. The molar mass o
f the produced lipase was determined to be approximately 67 kDa which comig
rated with bovine serum albumin in both a Sephadex G-100 column and SDS-PAG
E.