Abstract
Conidia of Aspergillus fumigatus, Aspergillus flavus, Aspergillus niger, Penicillium brevi-compactum, Penicillium frequentans, Penicillium spinulosum, and Penicillium verrucosum var. cyclopium were subjected to partition at varying pH values in an aqueous two-phase system containing charged polyethylene glycol. In the system, the partition behavior of the conidia of the Penicillium species varied when the pH was raised, while the conidia of the Aspergillus species seemed unaffected. P. brevi-compactum was separated from P. verrucosum var. cyclopium after only 10 transfers when subjected to stepwise partitioning. In the same way, 10 transfers were needed to separate P. verrucosum var. cyclopium from a mixture of conidia of three Aspergillus species. The partition behavior was influenced by the culture media used.
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