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The potentiality of some mould fungi, isolated from petroleum sludge to produce riboflavin when grown on hydrocarbon-containing media was tested. Aspergillus terreus was found to be distinguished by its capacity to produce riboflavin when cultivated on the different culture media tested. It was able to grow more luxuriantly and produce good riboflavin output on solar-containing medium. A solar concentration of 5% v/v favoured high riboflavin productivity. The maximal vitamin B2 yields were achieved after 20 days incubation at 30 degrees C. An initial pH value of 5.5-6.0 was found to be the optimum for growth of A. terreus and for riboflavin production.
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