| Patent 4490468: Production of ethanol by yeast using xylulose (2389 words) |
 | Xylulose may be obtained commercially, but due to the relatively high cost, it is generally desirable to obtain the material by alternative sources. |
| The resulting xylulose containing material (initial fermentation substrate) after appropriate adjustment of pH and/or temperature if needed, is then fed to a fermentor vessel B containing the required fermentation yeast. |
| Upon reaching a maximum conversion level of xylulose to ethanol in the fermentation of Example Four, 25 gms of wet Actinoplanes cells were added to the fermentation mixture, so as to facilitate isomerization of remaining xylose to xylulose, and subsequent fermentation of xylulose to ethanol. |
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