Table of Contents
Biotechnology Research International
Volume 2014 (2014), Article ID 293434, 11 pages
Research Article

Statistical Optimization of Media Components for Production of Fibrinolytic Alkaline Metalloproteases from Xenorhabdus indica KB-3

1Division of Microbiology, Indian Agricultural Research Institute, New Delhi 110012, India
2Department of Biotechnology, National Institute of Technology, Durgapur 713209, India
3Division of Nematology, Indian Agricultural Research Institute, New Delhi 110012, India

Received 10 December 2013; Revised 20 February 2014; Accepted 25 February 2014; Published 23 April 2014

Academic Editor: Manuel Canovas

Copyright © 2014 Kumar Pranaw et al. 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.


Xenorhabdus indica KB-3, a well-known protease producer, was isolated from its entomopathogenic nematode symbiont Steinernema thermophilum. Since medium constituents are critical to the protease production, the chemical components of the selected medium (soya casein digest broth) were optimized by rotatable central composite design (RCCD) using response surface methodology (RSM). The effects of all five chemical components (considered as independent variables), namely tryptone, soya peptone, dextrose, NaCl, and dipotassium phosphate, on protease production (dependent variable) were studied, and it was found that tryptone and dextrose had maximum influence on protease production. The protease production was increased significantly by 66.31% under optimal medium conditions (tryptone—5.71, soya peptone—4.9, dextrose—1.45, NaCl—6.08, and dipotassium phosphate—0.47 in g/L). To best of knowledge, there are no reports on optimization of medium component for protease production by X. indica KB-3 using RSM and their application in fibrinolysis. This study will be useful for industrial processes for production of protease enzyme from X. indica KB-3 for its application in the field of agriculture and medicine.