The synthesis of pectinase is investigated using six species of Asperg
illus, with five media differing either in their carbon sources or lev
el of carbon source(s). Five of the six species used, synthesized appr
eciable amounts of pectinase in the media containing sugars. Pectinase
synthesis was highest for A. niger, NCIM 548, with all the sugar cont
aining media. A. foetidus, NCIM 510, was the only one among the organi
sms studied, that responded well to the medium containing pectin in th
e absence of additional sugars supplied in the medium.