Zusammenfassung
Two thermophilic, anaerobic bacteria named JN4 and GD17 were isolated from
rotten wheat straw. The cellulolytic bacterium JN4 was identified as
Clostridium thermocellum and its companion bacterium GD17 was shown to be
Thermoanaerobacterium thermosaccharolyticum by 165 rDNA analysis and
morphological observation. The production of hydrogen by both strains
was investigated. C. thermocellum JN4 can degrade microcrystalline
cellulose to produce hydrogen, ethanol, acetic acid and lactic acid, but
cannot completely utilize the cellobiose and glucose produced by the
cellulose degradation. Its hydrogen yield was about 0.8 mol H-2 (mol
glucose)(-1), with lactate as the main product. When C. thermocellum JN4 was
co-cultured with T. thermosaccharolyticum GD17, hydrogen production
increased about 2-fold and H-2 yield increased to a high level of 1.8mol
H-2 (molglucose)(-1). Butyrate was the most abundant byproduct and
lactate was not detected at the end of the co-culture process. In
co-cultures, JN4 and GD17 could utilize several kinds of natural
substrates such as corn cob powder and corn stalk powder as carbon
sources for producing hydrogen. (c) 2008 International Association for
Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
Nutzer