Thermostable lipolytic enzymes production in batch and continuous cultures of Thermus thermophilus HB27.
Several studies in laboratory-scale bioreactors are undertaken in order to verify the beneficial effect of thermal spring water in the culture medium of Thermus thermophilus HB27. Two bioreactor configurations, stirred tank and airlift, are investigated to determine the most suitable one to develop a continuous process. Water mineral composition affects the lipolytic enzyme secretion and growth of T. thermophilus HB27 in both bioreactor configurations. Furthermore, the lipolytic activity is strongly enhanced when stirred tank bioreactor is used. Moreover, operation in a stirred tank at an agitation rate of 650 rpm leads to the highest total lipolytic activity (intra- and extracellular enzyme) around 280 U/L after 32 h. Continuous cultures operating in the optimised conditions determined in batch cultures are carried out. It is noticeable that the stirred tank bioreactor was able to operate in a continuous flow mode without operational problems. In addition, the lipolytic activity obtained is about 2-fold higher than that attained in batch cultures.
Domínguez
Alberto
A
Department of Chemical Engineering, University of Vigo, Vigo, Spain.
Deive
Francisco J
FJ
Pastrana
Lorenzo
L
Rúa
Maria L
ML
Longo
Maria A
MA
Sanroman
M Angeles
MA
D018533:Biomass; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002412:Cations; D003470:Culture Media / Q000737:chemistry; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D008066:Lipolysis; D013696:Temperature; D016963:Thermus thermophilus / Q000378:metabolism*; D013997:Time Factors; D014867:Water / Q000737:chemistry
D002412:Cations; D003470:Culture Media; D014867:Water