This research was made to evaluate the manipueira as substrat for citric acid biosynthesis by Aspergillus niger. The manipueira medium was compared in the same conditions of the synthetical medium, traditionally used in citric acid biosynthesis. The residue was kept at room temperature during 72 hours, and the physico-chemical characterization was made. The citric acid production did not change in the different media and the fungus did not grow hi the manipueira medium with concentrations about of 70 mg/l of cyanide. The results showed that more research is need to make manipueira utilization possible as a substrat for citric acid biosynthesis by Aspergillus niger.
citric acid; Aspergillus niger; substratum; manipueira; manioc residue