The Production Of Glycerol With S. Cerevisiae Essay

1175 Words Nov 23rd, 2014 null Page
In 1985-1990 we see that various scientists such as Kalle (1985), Vikar and Panesar (1987), and Hecker et al. (1990) had begun endeavors to develop more efficient alkali and sulfite processes. This was done by attempted by sparging with CO2 (the bubbling of inert gases in the liquid to remove dissolved gases) or installing a vacuum in the fermenter to control aeration. This method resulted in a 40% glycerol yield efficiency at concentrations of 230 g/L. (Kalle, 1985; Vikar and Panesar, 1987). A fed-batch and continuous version of this reactor was also used, however there were no significant changes in yield, and the cost to efficiency ratio did not make sense to continue the continuous system. The production of glycerol with S. cerevisiae is fairly tranquil, the problems carry a significant burden towards the usefulness of this system. The problems include low glycerol yields, due to the production of high concentration by-products (e.g. ethanol, acetic acid and acetaldehyde). This in fact causes high recovery prices since the required product is in such small concentrations mixed in much larger concentrations of by-products (Hecker et al., 1990). The system also requires a large amount of steering agents, required to suppress the ethanol production and express the glycerol in larger quantities, such as sulfite whilst fermenting thus increasing price again (Petrovska, 1999).
Another production method is the use of osmotolerant yeasts which are instant dry yeasts. According…

Related Documents