Bioprocess Optimization for Enhanced Production of L-asparaginase via Two Model-Based Experimental Designs by Alkaliphilic Streptomyces fradiae NEAE-82

Author(s): Hoda M. Soliman, Noura El-A. El-Naggar*, Sara M. El-Ewasy

Journal Name: Current Biotechnology

Volume 9 , Issue 1 , 2020

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Graphical Abstract:


Background: L-asparaginase is one of the most widely used chemotherapeutic agents for the treatment of a variety of lymphoproliferative disorders and particularly acute lymphoblastic leukemia. Due to increased applications of L-asparaginase in several industrial fields including food processing and medical fields, its production needs to be increased to several folds.

Objectives: The aim was (i) to identify the significant factors which affect L-asparaginase production by Streptomyces fradiae NEAE-82 and (ii) to achieve higher production of L-asparaginase.

Methods: Sixteen assigned factors and three dummy factors were screened using Plackett-Burman experimental design to determine the most important factors for the production of L-asparaginase by Streptomyces fradiae NEAE-82.

Results: L-asparagine was determined to be the most significant positive independent factor (P-value 0.0092) affecting L-asparaginase production by Streptomyces fradiae NEAE-82 followed by pH and NaCl with significant P-values of 0.0133 and 0.0272; respectively. These factors were further optimized by Box-Behnken experimental design. The optimized fermentation conditions, which resulted in the maximum L-asparagine activity of 53.572 UmL-1 are g/L: dextrose 4, L-asparagine 15, KNO3 2, MgSO4.7H2O 0.5, K2HPO4 1, FeSO4.7H2O 0.02, NaCl 0.2, ZnSO4 0.01 and inoculum size 2 %, v/v for 7 days incubation at temperature 37°C, agitation speed 100 rpm, pH 8.5.

Conclusion: A total of 3.41-fold increase in the production of L-asparaginase was achieved in the medium after statistical improvement (53.572 UmL-1) as compared to the unoptimized basal medium used prior to the application of Plackett-Burman (15.704 UmL-1).

Keywords: L-asparaginase production, Streptomyces fradiae NEAE-82, Plackett-Burman, Box-Behnken designs, lymphoblastic leukemia, lymphocytes.

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Year: 2020
Page: [23 - 37]
Pages: 15
DOI: 10.2174/2211550109666200206100445

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