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BioMed Research International
Volume 2014, Article ID 906097, 11 pages
http://dx.doi.org/10.1155/2014/906097
Research Article

Successive Nonstatistical and Statistical Approaches for the Improved Antibiotic Activity of Rare Actinomycete Nonomuraea sp. JAJ18

Department of Molecular Microbiology, School of Biotechnology, Madurai Kamaraj University, Madurai 625 021, India

Received 3 February 2014; Accepted 7 August 2014; Published 3 September 2014

Academic Editor: Paul M. Tulkens

Copyright © 2014 Polpass Arul Jose and Solomon Robinson David Jebakumar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The selection and optimization of nutritional constituents as well as their levels for the improved production of antibiotic by Nonomuraea sp. JAJ18 were carried out using combination of both nonstatistical one-factor-at-a-time (OFAT) method and statistical response surface methodology (RSM). Using OFAT method, starch and (NH4)2SO4 were identified as suitable carbon and nitrogen sources, respectively. Subsequently, starch, NaCl, and MgSO47H2O were recognized as the most significant media components with confidence level of above 95% using the Plackett-Burman design. The levels of the three media components were further optimized using RSM employed with Box-Behnken design. Accordingly, a second-order polynomial regression model was fitted into the experimental data. By analyzing the response surface plots as well as using numerical optimization method, the optimal levels for starch, NaCl, and MgSO47H2O were determined as 15.6 g/L, 0.8 g/L, and 1.98 g/L, respectively. With the optimized medium, 15.5% increase was observed in antibiotic activity of JAJ18. Results further support the use of RSM for media optimization. To the best of our knowledge, this is the first report of statistical media optimization for antibiotic production in rare actinomycete Nonomuraea species, which will be useful for the development of Nonomuraea cultivation process for efficient antibiotic production on a large scale.