enthalpy of E.coli fermentations

db drb13 at cornell.edu
Wed Sep 11 06:55:56 EST 1996


In article <513ih5$122 at gerry.cc.keele.ac.uk>, gbmatthew
<zbc25 at cc.keele.ac.uk> wrote:

> Hi
> anyone out there got a simple method for the calculating or estimating 
> the heat generated by an aerobic exponentially growing E.coli 
> fermentation ?


You can find enthalpy tables in Physics/chemisty reference books,  and you
simply calculate the difference in enthalpy (H) between substrates and
products, knowing the amounts of each consumed and produced.  You have to
know the end-products, however.  
A standard calculation would figure on the complete oxidation of glucose
to carbon dioxide, but if your bug was excreting acetate, this would
affect the amount of heat released.  Assuming you had plenty of oxygen (no
fermentation).

CH20 + O2 -->  CO2 + H2O = enthalpy of 468 kJ/mol carbon oxidized

on a per mol glucose basis, multiply by 6.  

Good Luck

Dan Bond



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