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Biohydrogen Production from Pretreated Lignocellulose by Clostridium thermocellum
Jingrong Cheng,Ming-Jun Zhu 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.1
In consolidated bioprocessing (CBP), the difference in optimum temperature between saccharification and fermentation poses a significant technical challenge to producing bioenergy efficiently with lignocellulose. The thermophilic anaerobic strain of Clostridium thermocellum has the potential to overcome this challenge if hydrolysis and fermentation is performed at an elevated temperature. However, this strain is sensitive to structure and components of lignocellulosic materials. To understand biohydrogen production from lignocellulosic materials, C. thermocellum was examined for biohydrogen production as well as bioconversion from different cellulosic materials (Avicel, filter paper and sugarcane bagasse (SCB)). We investigated hydrolysis-inhibitory effects of the cellulosic material types on the substrate degradation and biohydrogen production of C. thermocellum 27405. Within 168 h, the substrate degradation ratios of Avicel, filter paper, and SCB were 83.01, 51.78, and 42.19%, respectively. The substrate utilization and biohydrogen production of SCB reached 81 and 89.77% those of filter paper, respectively, indicating that SCB is a feasible substrate for biohydrogen production. Additionally, optimizing fermentation conditions can improve biohydrogen production, with the optimal conditions being an inoculum size of 7%, substrate concentration of 2%, particle size of 0.074 mm, and yeast extract concentration of 1%. This research provides important clues in relation to the low-cost conversion of renewable biomass to biohydrogen.
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Jingbo Li,Lei Liang,Jingrong Cheng,Yunan Huang,Ming-Jun Zhu,Shizhong Liang 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.5
Pigment was extracted to decolor the sugarcane juice alcohol wastewater and its antioxidant activities were evaluated. The pigment was extracted using ion exchange fiber along with macroporous resin D-101 as the absorbent and an ethanol-water mixture (6:4, v/v) as the eluent. Total flavonoid and phenolic contents of the pigment were determined. DPPH radical scavenging ability and reducing power of 1.0 mg/mL of the pigment were approximately 78.5 and 16.8%, respectively, compared to 1.0 mg/mL of the tea polyphenol (positive control). The hydroxyl radical scavenging ability of 10.0 mg/mL of the pigment was about 92.5% compared to that of positive control. The DPPH radical scavenging ability of the pigment was enhanced significantly with thermal treatment at 70 and 100oC. The result shows the proposed procedure can be effective to decolor such wastewater and to get antioxidative pigment.
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