Fermentation of corn fiber hydrolysate to lactic acid by the moderate thermophile Bacillus coagulans.
A strain of Bacillus coagulans that converted mixed sugars of glucose, xylose, and arabinose to L: -lactic acid with 85% yield at 50 degrees C was isolated from composted dairy manure. The strain was tolerant to aldehyde growth inhibitors at 2.5 g furfural/l, 2.5 g 5-hydroxymethylfurfural/l, 2.5 g vanillin/l, and 1.2 g p-hydroxybenzaldehyde/l. In a simultaneous saccharification and fermentation process, the strain converted a dilute-acid hydrolysate of 100 g corn fiber/l to 39 g lactic acid/l in 72 h at 50 degrees C. Because of its inhibitor tolerance and ability to fully utilize pentose sugars, this strain has potential to be developed as a biocatalyst for the conversion of agricultural residues into valuable chemicals.
Bischoff
Kenneth M
KM
U.S. Department of Agriculture, Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, 1815 N. University St., Peoria, IL 61604, USA. kenneth.bischoff@ars.usda.gov
Liu
Siqing
S
Hughes
Stephen R
SR
Rich
Joseph O
JO
D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001407:Bacillus / Q000187:drug effects / Q000302:isolation & purification / Q000378:metabolism*; D002417:Cattle; D005285:Fermentation; D019344:Lactic Acid / Q000378:metabolism*; D008372:Manure / Q000382:microbiology; D003313:Zea mays / Q000378:metabolism*
D000900:Anti-Bacterial Agents; D008372:Manure; D019344:Lactic Acid