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Potato starch and both untreated and decationized dextrose syrups were used as substrates for submerged citric acid biosynthesis using a mutant of Aspergillus niger. The same yield of product (80%) was achieved with both syrups and the starch despite having different trace metals content. The obtained mutant was more sensitive than the parent to Cd2+, Mo2+, and As3+, with decreasing yields of citric...
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