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Chang C.,Wuhan University | Chang C.,Guangzhou Sugarcane Industry Research Institute | Chang C.,Kyoto University | Peng N.,Guangzhou Sugarcane Industry Research Institute | And 5 more authors.
Carbohydrate Polymers | Year: 2013

Novel hybrid hydrogels were prepared by introducing nano-hydroxyapatite (nHAp) into chitin solution dissolved in NaOH/urea aqueous solution at low temperature, and then by cross-linking with epichlorohydrin (ECH). Their structure and morphology were characterized by FTIR spectra, wide-angle X-ray diffraction (WAXD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Our findings revealed that hydroxyapatite nano-particles were uniformly dispersed in chitin hydrogel networks. The chitin/nHAP hybrid hydrogel (Gel2) exhibited about 10 times higher mechanical properties (compressive strength: 274 kPa) than that of chitin hydrogel. Moreover, COS-7 cell culture experiment proved that cells could adhere and proliferate well on the chitin/nHAp hydrogels, suggesting good biocompatibility. All these results signified that these bio-materials could be potential candidates as scaffolds for tissue engineering. © 2012 Elsevier Ltd.


Zeng J.,Wuhan University | Zeng J.,Guangzhou Sugarcane Industry Research Institute | Li R.,Wuhan University | Liu S.,Wuhan University | Zhang L.,Wuhan University
ACS Applied Materials and Interfaces | Year: 2011

Fiber-like TiO2 nanomaterials were designed and created, for the first time, by in situ synthesis of TiO2 nanoparticles in regenerated cellulose fibers in the wet state, followed by calcination at 400-800 °C to remove the cellulose matrix. The cellulose fibers were prepared in an NaOH/urea aqueous system with cooling via an industrialmachine. The structure and properties of the fiber-like TiO2 nanomaterials were characterized with scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and photocatalytic degradation tests. The results revealed that the mean diameter of the fiberlike TiO2 nanomaterials, which consisted of TiO2 nanoparticles with a mean size from 21 to 37 nm, was 7-8 μm. The TiO2 nanomaterials exhibited different crystallinity phases from anatase to rutile, depending on the calcinating temperature. With a decrease in the calcinating temperature from 800 to 400 °C, the surface area of the TiO2 nanomaterials increased. The photocatalytic activity for the degradation of methyl orange of the anatase T-400 fibers calcined at 400 °C was the highest, compared with that at 600 and 800 °C. This work provided a simple and "green" pathway for the preparation of inorganic nanomaterials with different crystal structures by using porous regenerated cellulose matrix. © 2011 American Chemical Society.


Guo T.,Nanjing University of Technology | Guo T.,Guangzhou Sugarcane Industry Research Institute | He A.-Y.,Nanjing University of Technology | Du T.-F.,Nanjing University of Technology | And 5 more authors.
Bioresource Technology | Year: 2013

A Clostridium beijerinckii mutant RT66 with considerable inhibitor-tolerance obtained by continuous culture was used for butanol production from non-detoxified hemicellulosic hydrolysate of corn fiber treated with dilute sulfuric acid (SAHHC). In fed-batch fermentation, 1.8. L of diluted SAHHC containing 10. g/L of reducing sugar was provided during the acidogenic phase and 0.2. L of concentrated SAHHC containing 300. g/L of reducing sugar was provided during the solventogenic phase. The mutant produced a total amount of solvents of 12.9. g/L, which consisted of 3.1. g/L of acetone, 9.3. g/L of butanol and 0.5. g/L of ethanol. A solvent yield of 0.35. g/g sugar and a productivity of 0.18. g/L. h in 72. h were achieved. The remarkable inhibitor-tolerance of C. beijerinckii RT66 demonstrates that this may be an excellent strain for butanol production from ligocellulosic materials. © 2012.


Guo T.,Nanjing University of Technology | Guo T.,Guangzhou Sugarcane Industry Research Institute | Tang Y.,Nanjing University of Technology | Zhang Q.-Y.,Nanjing University of Technology | And 4 more authors.
Journal of Industrial Microbiology and Biotechnology | Year: 2012

Clostridium beijerinckii mutant strain IB4, which has a high level of inhibitor tolerance, was screened by low-energy ion implantation and used for butanol fermentation from a non-detoxified hemicellulosic hydrolysate of corn Wber treated with dilute sulfuric acid (SAHHC). Evaluation of toxicity showed C. beijerinckii IB4 had a higher level of tolerance than parent strain C. beijerinckii NCIMB 8052 for five out of six phenolic compounds tested (the exception was vanillin). Using glucose as carbon source, C. beijerinckii IB4 produced 9.1 g l -1 of butanol with an acetone/butanol/ethanol (ABE) yield of 0.41 g g -1 . When non-detoxified SAHHC was used as carbon source, C. beijerinckii NCIMB 8052 grew well but ABE production was inhibited. By contrast, C. beijerinckii IB4 produced 9.5 g l -1 of ABE with a yield of 0.34 g g -1, including 2.2 g l -1 acetone, 6.8 g l -1 butanol, and 0.5 g l -1 ethanol. The remarkable fermentation and inhibitor tolerance of C. beijerinckii IB4 appears promising for ABE production from lignocellulosic materials. © 2011 Society for Industrial Microbiology and Biotechnology.


Chang C.,Kyoto University | Chang C.,Guangzhou Sugarcane Industry Research Institute | Teramoto Y.,Kyoto University | Nishio Y.,Kyoto University
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2013

O-(2,3-dihydroxypropyl) cellulose (DHPC) samples were synthesized by etherification of cellulose with glycidol (GLY) in a NaOH/urea aqueous solution system under different reaction conditions, so that they had different degrees of ether substitution (DS) in both the overall and regional distributions. The characterization was made by NMR spectroscopy in order to clarify the effects of the molar ratio of in-fed GLY to anhydroglucose unit and of the reaction temperature not only on the total and regional DSs but also on the molar substitution (MSdhp) for the multireactive dihydroxypropyl group. The evaluation of MSdhp was performed after complete propionylation of each DHPC sample. Determination of molecular weights was also conducted on the propionylated DHPCs by GPC analysis. As a preliminary extension, butyralization of DHPC was undertaken in aqueous solution by using p-toluenesulfonic acid as catalyst together with butyraldehyde (BuA). Two-dimensional NMR ( 1H-13C gHSQC) spectra measurements revealed that the products contained butyral groups, owing to dehydration-cyclization between the BuA-carbonyl and the duplicate hydroxyls in the side chain of DHPC. Such butyral derivatives of cellulose are expected to be a promising functional material parallel or superior to poly(vinyl butyral) available for safety glass interlayers, etc. © 2013 Wiley Periodicals, Inc.


Tian Q.-Q.,South China University of Technology | Liang L.,Guangzhou Sugarcane Industry Research Institute | Zhu M.-J.,South China University of Technology
Bioresource Technology | Year: 2015

Clostridium thermocellum ATCC 27405 was used to degrade sugarcane bagasse (SCB) directly for hydrogen production, which was significantly enhanced by supplementing medium with CaCO3. The effect of CaCO3 concentration on the hydrogen production was investigated. The hydrogen production was significantly enhanced with the CaCO3 concentration increased from 10mM to 20mM. However, with the CaCO3 concentration further increased from 20mM to 100mM, the hydrogen production didn't increase further. Under the optimal CaCO3 concentration of 20mM, the hydrogen production reached 97.83±5.19mmol/L from 2% sodium hydroxide-pretreated SCB, a 116.72% increase over the control (45.14±1.03mmol/L), and the yield of hydrogen production reached 4.89mmol H2/g SCBadded. Additionally, CaCO3 promoted the biodegradation of SCB and the growth of C. thermocellum. The stimulatory effects of CaCO3 on biohydrogen production are mainly attributed to the buffering capacity of carbonate. The study provides a novel strategy to enhance biohydrogen production from lignocellulose. © 2015 Elsevier Ltd.


Zhu Z.-S.,South China University of Technology | Zhu M.-J.,South China University of Technology | Xu W.-X.,South China University of Technology | Liang L.,Guangzhou Sugarcane Industry Research Institute
Biotechnology and Bioprocess Engineering | Year: 2012

In this study, we investigated the production of bioethanol from sugarcane bagasse (SCB) using an NH4OH-H2O2 pretreatment and simultaneous saccharification and co-fermentation (SScF). Response surface methodology and a 23 Box-Behnken design were used to evaluate the effect of different liquid mixture concentrations, liquid-tosolid ratios (LSRs) and pretreatment temperatures on the production of ethanol. The liquid mixture concentration and LSR significantly influenced the fermentation efficiency. Based on ridge max analysis, the following pretreatment conditions resulted in a fermentation efficiency of 95.79 ± 0.01%: liquid mixture concentration 53%, LSR 28, and atemperature of 63°C. A morphological analysis performed using scanning electron microscopy (SEM) and chemical characterization revealed that these pretreatment conditions were effective in disrupting the sugarcane fibers and removing lignin. Ethanol fermentation with the pretreated SCB using SScF in yeast SHY 07-1 resulted in an ethanol concentration of 14.65 ± 0.17 g/L, an ethanol yield of 0.48 ± 0.01 g/g, and an ethanol productivity of 0.12 ± 0.01 g/(L/ h), which represents increases of 106.02, 89.98, and 107.02%, respectively, over the values obtained from SScF with untreated SCB. © 2012 The Korean Society for Biotechnology and Bioengineering and Springer.


Tian Q.-Q.,South China University of Technology | Liang L.,Guangzhou Sugarcane Industry Research Institute | Zhu M.-J.,South China University of Technology
Bioresource Technology | Year: 2015

Clostridium thermocellum ATCC 27405 was used to degrade sugarcane bagasse (SCB) directly for hydrogen production, which was significantly enhanced by supplementing medium with CaCO3. The effect of CaCO3 concentration on the hydrogen production was investigated. The hydrogen production was significantly enhanced with the CaCO3 concentration increased from 10mM to 20mM. However, with the CaCO3 concentration further increased from 20mM to 100mM, the hydrogen production didn't increase further. Under the optimal CaCO3 concentration of 20mM, the hydrogen production reached 97.83±5.19mmol/L from 2% sodium hydroxide-pretreated SCB, a 116.72% increase over the control (45.14±1.03mmol/L), and the yield of hydrogen production reached 4.89mmol H2/g SCBadded. Additionally, CaCO3 promoted the biodegradation of SCB and the growth of C. thermocellum. The stimulatory effects of CaCO3 on biohydrogen production are mainly attributed to the buffering capacity of carbonate. The study provides a novel strategy to enhance biohydrogen production from lignocellulose. © 2015 Elsevier Ltd.


Peng L.,Guangzhou Sugarcane Industry Research Institute | Jackson P.A.,CSIRO | Li Q.-W.,Guangzhou Sugarcane Industry Research Institute | Deng H.-H.,Guangzhou Sugarcane Industry Research Institute
Bioenergy Research | Year: 2014

There has been rapid economic development in China in recent decades, and demand for energy has consequently been increasing rapidly. Development and utilisation of clean and renewable energy has been promoted by the Chinese government to help sustain long-term and stable development. Sugarcane is being increasingly used in several countries as feedstock for renewable energy products, and is a major and expanding crop in southern China. In this paper, we discuss the potential of sugarcane as a feedstock for bioenergy production in China. It includes a review of (1) the existing sugarcane industry in China and key bio-physical factors affecting the extent to which sugarcane-based industries could supply feedstock for renewable energy production in China, (2) the economic and policy factors which are likely to affect production of bioenergy from sugarcane in China, and (3) recommendations on actions and policies that may assist with appropriate development of bioenergy production from sugarcane in China. Existing and expected future economic conditions are unlikely to favour production of biofuel from the sugar component in cane. However, the fibre component of cane remains an under-utilised resource component. A conclusion is made that sugarcane fibre has potential to contribute towards renewable electricity production in China. However, at present, favourable incentives do not exist to encourage this production. It is suggested that policies to facilitate cost-effective production of renewable electricity by sugar mills, consistent with national objectives regarding production of renewable energy, be considered by governments. Priorities for future research are in improving biomass yields per unit area of land and technologies for low-cost conversion of lignocellulosic biomass into biofuel. © 2014 Springer Science+Business Media New York.


Li H.,South China University of Technology | Ren J.,South China University of Technology | Zhong L.,South China University of Technology | Sun R.,South China University of Technology | And 2 more authors.
Bioresource Technology | Year: 2015

The conversion of xylose, water-insoluble hemicelluloses (WIH) and water-soluble fraction (WSF) of corncob to furfural was performed using montmorillonite with tin ions (Sn-MMT) containing double acid sites as a solid acid catalyst. The co-existence of Lewis acids and Brønsted acids in Sn-MMT was shown to improve the furfural yield and selectivity. 76.79% furfural yield and 82.45% furfural selectivity were obtained from xylose using Sn-MMT as a catalyst in a biphasic system with 2-s-butylphenol (SBP) as the organic extracting layer and dimethyl sulfoxide (DMSO) as the co-solvent in contact with an aqueous phase saturated with NaCl (SBP/NaCl-DMSO) at 180. °C for 30. min. Furthermore, Sn-MMT also demonstrated the excellent catalytic performance in the conversion of pentose-rich materials of corncob and 39.56% and 54.15% furfural yields can be directly obtained from WIH and WSF in the SBP/NaCl-DMSO system, respectively. © 2014 Elsevier Ltd.

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