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International Journal of Medicinal Mushrooms
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ISSN Imprimir: 1521-9437
ISSN En Línea: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushr.v13.i5.50
pages 455-464

Enhanced Production of Medicinal Polysaccharide by Submerged Fermentation of Lingzhi or Reishi Medicinal Mushroom Ganoderma lucidium (W.Curt.:Fr.) P. Karst. Using Statistical and Evolutionary Optimization Methods

Gurunathan Baskar
Department of Biotechnology, St. Joseph's College of Engineering, Chennai, India
Shree Rajesh K. Lakshmi Jai Sathya
Department of Biotechnology, St. Joseph's College of Engineering, Chennai − 600 119, India


Statistical and evolutionary optimization of media composition was employed for the production of medicinal exopolysaccharide (EPS) by Lingzhi or Reishi medicinal mushroom Ganoderma lucidium MTCC 1039 using soya bean meal flour as low-cost substrate. Soya bean meal flour, ammonium chloride, glucose, and pH were identified as the most important variables for EPS yield using the two-level Plackett-Burman design and further optimized using the central composite design (CCD) and the artificial neural network (ANN)-linked genetic algorithm (GA). The high value of coefficient of determination of ANN (R2 = 0.982) indicates that the ANN model was more accurate than the second-order polynomial model of CCD (R2 = 0.91) for representing the effect of media composition on EPS yield. The predicted optimum media composition using ANN-linked GA was soybean meal flour 2.98%, glucose 3.26%, ammonium chloride 0.25%, and initial pH 7.5 for the maximum predicted EPS yield of 1005.55 mg/L. The experimental EPS yield obtained using the predicted optimum media composition was 1012.36 mg/L, which validates the high degree of accuracy of evolutionary optimization for enhanced production of EPS by submerged fermentation of G. lucidium.

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