Author/Editor		Batič, Martin; Raspor, Peter
Title		Effect of cultivation mode on a bioprocess for chromium yeast biomass enrichment
Type		članek
Source		Pflugers Arch
Vol. and No.		Letnik 439, št. 3 Suppl
Publication year		2000
Volume		str. R73-5
Language		eng
Abstract		Defined cultivation media for yeast growth which contained 278.8 mM of glucose and 0.1 mM of chromium(III) added as K2Cr(SO4)2 xx12 H2O was used in batch and combined batch/fed-batch cultivation mode. In fed batch cultivation mode the rate of substrate addition remained constant during growth of yeast and corresponded to a growth rate of 0.25 h-1. In both cases the growth and yeast activity was followed by on line measurement of optical density, pH and pO2 at 30 degree C. At the end of the bioprocess the concentration of protein in yeast biomass was determined off line by the biuret reaction. Total and organically bound chromium was detected by ETA-AAS. Different cultivation modes affected the total cell protein concentration of yeast grown in media supplemented with chromium. In batch process the protein content represented 25.7% of dry yeast biomass, in contrast in the mixed bioprocess this value was 16.9% one the same period of time. The influence of cultivation mode on chromium uptake was seen in total chromium accumulation which reached 8.68 +- 0.16 micromol g-1 d.wt. in batch and 1.92 +- 0.04 micromol of chromium g-1 of dry yeast biomass in combined batch/fed-batch cultivation mode. The opposite was observed for organically bound chromium. The 60 % of total accumulated chromium was organically bound during yeast growth in combined batch/fed-batch mode. When yeast was grown in batch mode this value attained 13.5 %. Results suggested that a combined batch/fed-batch mode of cultivation was more effective over a batch system in chromium biotransformation to organically bound chromium, regardless of the lower protein ratio determined in the yeast biomass.
Descriptors		CANDIDA BIOMASS CHROMIUM CULTURE MEDIA