Author(s): Dwiarti L, Otsuka M, Miura S, Yaguchi M, Okabe M
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Abstract Sago starch was hydrolyzed using either chemical agents, or enzymes at various pH and concentrations. Hydrolysis using 5000 AUN/ml (0.5\%, w/v) glucoamylase exhibited the highest itaconic acid yield up to 0.36 g/g sago starch, whereas hydrolysis using nitric acid at pH 2.0 yielded 0.35 g/g sago starch. The medium was optimized and the composition was (g/l) 140 sago starch, 1.8 corn steep liquor, 1.2 MgSO(4).7H(2)O and 2.9 NH(4)NO(3). When the optimal conditions of hydrolysis and medium composition were applied to itaconic acid production in a 3-l jar fermentor, the itaconic acid production was 48.2 g/l with a yield of 0.34 g/g sago starch. This was filtered from the cultured broth and 37.1g of itaconic acid was recovered with a purity of 97.2\%. This result showed that sago starch could be converted to a value-added product with only a simple pretreatment.
This article was published in Bioresour Technol
and referenced in Journal of Biodiversity, Bioprospecting and Development