ISSN: 0973-7510

E-ISSN: 2581-690X

Nitin Verma , M.C. Bansal and Vivek Kumar
Department of Paper Technology, Indian Institute of Technology, Roorkee Saharanpur Campus, Saharanpur – 247 001, India.
J Pure Appl Microbiol. 2009;3(2):559-565
© The Author(s). 2009
Received: 06/03/2009 | Accepted: 12/04/2009| Published: 31/10/2009
Abstract

Filamentous fungal fermentation is widely used to commercially produce useful products such as organic acids, enzymes, antibiotics etc. Fungi can be grown in submerged cultures in several different morphological forms: suspended mycelia, clumps, or pellets. A change in fungal morphology is influenced by medium composition, inoculum, pH, medium shear, additives (polymers, surfactants, and chelators), culture temperature, and medium viscosity. Inoculum size is generally recognized as of great importance to the process of fungal pellet formation. Many industrially significant microbial products are produced during secondary metabolism by fungal pellets. Morphology of the fungal pellets has a significant influence on the mass transfer and turn over processes in submerged cultures. In pellets with a loose hyphal structure, convictive transport is possible, but does not necessarily result in higher conversion rates compared to compact pellets morphology. The interaction of hyphae is important in determining the possibility of pellets formation .The pellet diameter and compactness were affected by the agitation intensity of the broth. It has been concluded that fungal growth in pellet form is a favorable alternative which benefits most of the fungal fermentations due to better mass and oxygen transfer into the biomass and lower energy consumption for aeration and agitation. This paper describes the pellets morphology achieved by different fungal strains under culture (PDB) and the production media(with varying sugar components) at 30°C and 180 rpm.

Keywords

Pellets, Fungal strains, Growth morphology, Pellet diameter, Mass transfer

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© The Author(s) 2009. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.