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Optimization of Corynebacterium glutamicum Glutamic Acid Production by Response Surface Methodology

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Abstract

Response surface methodology (RSM) was used to evaluate the effects of fermentation parameters for glutamic acid (GA) production by Corynebacterium glutamicum CECT690 in submerged fermentation using palm date waste as substrate. To attain this purpose at the first stage, inoculum size, substrate concentration, penicillin concentration, phosphate concentration, and inoculum age were optimized for GA production. The next stage, the level of air flow rate in a 5-l fermenter (batch mode) which was run in optimized conditions was determined. The first stage gave the following results for the fermentation conditions optimized using RSM in 500-ml shake flasks: inoculum size 2% (v/v), substrate concentration 25% (w/v), penicillin concentration 1 U/ml, phosphate concentration 4 g/l, and inoculum age 10 h. Moreover, the maximum GA amount predicted by the model was 39.32 mg/ml. This was in agreement with the actual experimental value (36.64 mg/ml). In the second stage of the study, the amounts of GA were 118.75, 142.25, and 95.83 mg/ml in optimized conditions with the three levels of air flow rate of 0.6, 1.2, and 1.6 vvm, respectively. The present results demonstrate the potential of date waste juice as a substrate for producing GA by cultivation of C. glutamicum.

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Acknowledgment

The authors are grateful to the Department of Food Science and Technology in Tarbiat Modares University (Tehran, Iran) for financial support of the project.

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  1. Department of Food Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran

    Mahmoud Tavakkoli, Zohreh Hamidi-Esfahani & Mohammad Hossein Azizi

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  1. Mahmoud Tavakkoli
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  2. Zohreh Hamidi-Esfahani
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  3. Mohammad Hossein Azizi
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Correspondence to Zohreh Hamidi-Esfahani.

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Tavakkoli, M., Hamidi-Esfahani, Z. & Azizi, M.H. Optimization of Corynebacterium glutamicum Glutamic Acid Production by Response Surface Methodology. Food Bioprocess Technol 5, 92–99 (2012). https://doi.org/10.1007/s11947-009-0242-7

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