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Culture condition for production of glucoamylase from rice bran byAspergillus terreus

Conditions de culture pour la production de glucoamylase à partir de son de riz parAspergillus terreus

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Summary

Optimal conditions for the production of glucoamylase from rice bran usingAspergillus terreus in stationary culture were a medium containing 20 g rice bran/l, 0.3% (w/v) (NH4)2SO4 and 0.2% (w/v) peptone at 30°C with an initial pH of 3.0. Enzymatic activity was maximal after 4 d. Glucose was the major reducing sugar produced by hydrolysis of starch. Carbohydrates favouring induction of glucoamylase were, in order: maltose, starch, cellobiose, lactose, glucose, fructose and galactose. Amino acids, in particular glycine, lysine, isoleucine and histidine, were vital for glucoamylase synthesis. Tween 80 and Triton X-100 enhanced the growth but suppressed glucoamylase synthesis.

Résumé

Les conditions optimales pour la production de glucoamylase à partir de son de riz en utilisantAspergillus terreus en culture en état stationnaire, consistent en un milieu contenant 20 g de son de riz par litre, 0.3 % (poids/vol.) de (NH4)2 SO4 et 0.2 % (poids/vol.) de peptone, à 30 °C avec un pH initial de 3.0. L'activité enzymatique est maximum après 4 jours. Le glucose est le principal sucre réducteur produit par hydrolyse de l'amidon. Les hydrates de carbone qui favorisent l'induction de la glucoamylase, sont, dans l'ordre: le maltose, l'amidon, la cellobiose, le lactose, le glucose, le fructose et le galactose. Les acides aminés, en particulier la glycine, la lysine, l'isoleucine et l'histidine sont vitales pour la synthèse de glucoamylase. Le tween 80 et le triton X-100 augmentent la croissance mais suppriment la synthèse de glucoamylase.

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Ali, S., Mahmood, S., Alam, R. et al. Culture condition for production of glucoamylase from rice bran byAspergillus terreus . World J Microbiol Biotechnol 5, 525–532 (1989). https://doi.org/10.1007/BF01741829

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