Butane-oxidation products as substrates for yeast growth

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Abstract
Samples of two streams, a primary oxidation product and a main recycle stream, were obtained from a large industrial plant oxidizing butane. These are not wastes, but streams within the production process, containing mixtures of oxidation products of butane. Their suitability as substrates for yeast growth was studied. Generation times and cell yields were determined for 11 different yeasts. The recycle stream gave unexpectedly low cell yields. Growth rates and yields were accordingly determined for 17 pure compounds representing the principal components of the two streams: alcohols, acids, esters, ketones, and an aldehyde, all of five carbon atoms or less. The 11 yeasts showed great variation in their ability to use these components. Yields of yeast based on the carbon content of the two samples were as expected from the individual components, but the recycle stream sample, which was rich in unutilizable ketones, was a poor substrate. The ketones may also have slowed the growth of the yeasts somewhat.

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