alexa Properties of the Entomoparasitic Nematodes (Heterorhab
ISSN: 2155-9821

Journal of Bioprocessing & Biotechniques
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Research Article

Properties of the Entomoparasitic Nematodes (Heterorhabditis bacteriophora) Liquid Culture using a Helicoidal Ribbon Agitator as Rheometric System

Diola-Marina Nuñez-Ramirez1, Luis Medina-Torres2*, Fausto Calderas3 and Guadalupe Sanchez-Olivares4
1Durango Institute of Technology, Department of Chemical and Biochemical Engineering, Felipe Pescador # 1803 Ote. CP 34080, Durango, Durango, Mexico
2Department of Chemical Engineering, Joint E, National Autonomous University of Mexico (UNAM), Mexico, DF 04510, Mexico
3Institute of Materials Research, National Autonomous University of Mexico (UNAM), Mexico, DF 04510, Mexico
4CIATEC, A.C. Omega 201, Fracc.Industrial Delta, CP 37545, León, Gto., México
Corresponding Author : Luis Medina-Torres
Department of Chemical Engineering
Joint E, National Autonomous University of Mexico (UNAM)
DF 04510, Mexico
Tel: 52-555-622-5360
Fax: 52-555-622-5329
E-mail: [email protected]
Received November 20, 2014; Accepted January 29, 2015; Published February 02, 2015
Citation: Nuñez-Ramirez DM, Medina-Torres L, Calderas F, Sanchez-Olivares G (2015) Properties of the Entomoparasitic Nematodes (Heterorhabditis bacteriophora) Liquid Culture using a Helicoidal Ribbon Agitator as Rheometric System. J Bioprocess Biotech 5: 207 doi: 10.4172/2155-9821.1000207
Copyright: © 2015 Nuñez-Ramirez DM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


The rheological parameters: flow behaviour index n, flow consistency index K and effective viscosity ηe were estimated for the entomoparasitic nematodes Heterorhabditis bacteriophora liquid broth at different culture maturation times. The nematode or nematodes were cultivated during 20 days in a bioreactor, and the growth media inside the bioreactor was enriched with protein and fat sources. Rheological parameters for the heterogeneous suspension were estimated with mixer principles employing a helical ribbon agitator fixed to a rheometer. As the culture matured, n decreased from 0.8 to 0.2 (-) and K increased up to 1200 mPa•sn; ηe showed a non-Newtonian (n<1) behaviour, ηe reached peak values of 0.32 Pa•s for a rotational speed of 0.5 revolutions per second (rps) and 0.048 Pa•s for 2.5 rps. Rheological properties reported here could be more reliable as compared to those reported for non-homogeneous liquid fermentations where estimations were performed with conventional geometries (i.e. concentric cylinders) which are appropriate for homogeneous systems but not for non-homogeneous ones.


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