Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

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Rymowicz W. , Lenart D. 2004. COMPARISON OF DIFFERENT STRAINS OF ASPERGILLUS NIGER FOR OXALIC ACID PRODUCTION FROM LIPID SUBSTRATES, EJPAU 7(2), #01.
Available Online: http://www.ejpau.media.pl/volume7/issue2/biotechnology/abs-01.html

ABSTRACT

One wild-type strain and eight mutants of the fungi species of Aspergillus niger were screened for their ability to produce oxalic acid on lipids media using batch fermentation. All of the tested fungi strains were able to utilize crude rapeseed oil as energy and carbon source. A final oxalic acid concentration ranged from 8 to 66.1 g/L, depending on the strain used. A. niger XP (induced with UV irradiation) was found to be the most suitable for oxalic acid production from lipid substrates. The highest production of oxalic acid (66.1 g/L), the oxalate yield (1.39 g/g) and the overall oxalate productivity (9.4 g/L·d) were obtained when the fermentation medium contained 50 g/L of oil and at pH 5 maintained from the beginning of the fermentation process.

Key words: Aspergillus niger, oxalic acid, biosynthesis, lipids.

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