Abstract：
:Growth media for cellulolytic Clostridium thermocellum ATCC 27405 and Caldicellulosiruptor bescii bacteria usually contain excess nutrients that would increase costs for consolidated bioprocessing for biofuel production and create a waste stream with nitrogen, sulfur and phosphate. C. thermocellum was grown on crystalline cellulose with varying concentrations of nitrogen and sulfur compounds, and growth rate and ethanol production response curves were determined. Both bacteria assimilated sulfate in the presence of ascorbate reductant, increasing the ratio of oxidized to reduced fermentation products. From these results, a low ionic strength, defined minimal nutrient medium with decreased nitrogen, sulfur, phosphate and vitamin supplements was developed for the fermentation of cellobiose, cellulose and acid-pretreated Populus. Carbon and electron balance calculations indicate the unidentified residual fermentation products must include highly reduced molecules. Both bacterial populations were maintained in co-cultures with substrates containing cellulose and xylan in defined medium with sulfate and basal vitamin supplements.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Kridelbaugh DM,Nelson J,Engle NL,Tschaplinski TJ,Graham DEdoi
10.1016/j.biortech.2012.12.006subject
Has Abstractpub_date
2013-02-01 00:00:00pages
125-35eissn
0960-8524issn
1873-2976pii
S0960-8524(12)01860-3journal_volume
130pub_type
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