Agricultural and Biosystems Engineering Publications

Document Type

Article

Publication Date

2-2013

Journal or Book Title

Journal of the Science of Food and Agriculture

Volume

93

Issue

3

First Page

498

Last Page

503

Research Focus Area(s)

Biological and Process Engineering and Technology

DOI

10.1002/jsfa.5803

Abstract

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 CO2production to assess the aerobic stability of DWG incubated at three temperatures (12 °C, 22 °C, 32 °C) and compared CO2production 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.

Comments

This article is from Journal of the Science of Food and Agriculture 93, no. 3 (February 2013): 498–503, doi:10.1002/jsfa.5803.

Language

en

Date Available

January 29, 2013

File Format

application/pdf

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