Starchy materials such as corn starch, soft wheat flour, potato flour, cassava flour, sorghum starch, sweet potato and industrial potato flours, either acid or enzymatically hydrolysed, were used as substrates for itaconic acid production by Aspergillus terreus NRRL 1960. Both production and yield were highest on corn starch (18·4 g l−1 and 34·0%, respectively). The degree of hydrolysis had a great influence on acid production which was highest when corn starch was saccharified at 85 DE (dextrose equivalent). In a 3 litre benchtop fermenter, itaconic acid production and productivity were 19·8 g l−1 and 0·13 g l−1 h−1, respectively.
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Petruccioli et al. (1999) studied this question.
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