Changes in morphology of Paecilomyces japonica and their effect on broth rheology during production of exo-biopolymers
2001
Sinha, J. | Bae, J.T. | Park, J.P. | Kim, K.H. | Song, C.H. | Yun, J.W.
The influence of Paecilomyces japonica pellet morphology on fermentation broth rheology and exobiopolymer production was investigated in a 5-l jar fermenter. Rapid formation of pellets was observed after the first day of fermentation; and these slowly increased in size and roughness. This, together with the increase in biomass concentration, altered the transport characteristics and broth rheology towards a pseudoplastic nature which, in turn, influenced cell growth and exo-biopolymer production. At mild agitation, high aeration and optimum substrate concentration, pellets were the most predominant morphological form, compared with free mycelia. The broth rheology showed pseudoplastic behavior; and the fungal morphology was closely related to the rheological properties.
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