†Present address: Iowa State University, Department of Agricultural and Biosystems Engineering, 3167 NSRIC Bldg., Ames, IA 50011, USA.
Aerobic stability of distillers wet grains as influenced by temperature†
Article first published online: 3 AUG 2012
Published 2012 by John Wiley & Sons, Ltd.
Journal of the Science of Food and Agriculture
Volume 93, Issue 3, pages 498–503, February 2013
How to Cite
Lehman, R. M. and Rosentrater, K. A. (2013), Aerobic stability of distillers wet grains as influenced by temperature. J. Sci. Food Agric., 93: 498–503. doi: 10.1002/jsfa.5803
This article is a US Government work and is in the public domain in the USA.
- Issue published online: 28 JAN 2013
- Article first published online: 3 AUG 2012
- Manuscript Accepted: 13 JUN 2012
- Manuscript Revised: 30 MAY 2012
- Manuscript Received: 22 SEP 2011
- aerobic stability;
- distillers wet grains;
- ethanol production;
BACKGROUND: The storability of distillers wet grains (DWG) influences the economic, energetic, and carbon balances of fuel ethanol production, yet there are limited published data on the deterioration of DWG following its production. We used biogenic CO2 production to assess the aerobic stability of DWG incubated at three temperatures (12 °C, 22 °C, 32 °C) and compared CO2 production over time to the appearance of mold and changes in DWG color parameters.
RESULTS: CO2 production and mold colonization indicate that at temperatures near 12 °C, the aerobic stability of DWG was high and that it can be stored for at least a 10-day period. At temperatures close to 22 °C, the onset of increased microbial activity and visible mold colonization occurred between 4 and 7 days and both activity and mold ratings were very high by the ninth day in all three experiments. At 32 °C, 2 days may be a more appropriate limit for storage.
CONCLUSION: Temperature and time interact in a nonlinear fashion that permits the prediction of DWG stability boundaries. The simple visual appearance of mold appears to be a reasonable indicator that correlates well (r = 0.694) with CO2 production, a measure of the aerobic stability of DWG. Published 2012 by John Wiley & Sons, Ltd.