Anaerobic degradation of microcrystalline cellulose: kinetics and micro-scale structure evolution |
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Authors: | Yu Lei Chen Zi-Xiang Tong Xin Li Kuan Li Wen-Wei |
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Institution: | a Advanced Laboratory for Environmental Research and Technology, USTC-CityU Joint Advanced Research Centre, Suzhou 215123, China b Key Laboratory of Tea Biochemistry & Biotechnology, Anhui Agricultural University, Hefei 230026, China c School of Computer Science, National University of Defense Technology, Changsha 410073, China d Department of Chemistry, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | The degradation kinetics and micro-scale structure change of microcrystalline cellulose during anaerobic biodegradation were investigated. A modified Logistic model was established to properly describe the kinetics, which showed good fitness and wide applicability for cellulose degradation. A maximum degradation rate of 0.14 g L−1 h−1 was achieved after cultivating for 51.5 h. This result was in good agreement with the scanning electron microscope and X-ray diffraction analysis. Channels of 400-500 nm size started to occur on the crystalline surface of cellulose at around the inflexion time. Accordingly, the crystallinity significantly decreased at this point, indicating a degradation of the crystalline structure zones by anaerobic bacteria. This study offers direct morphological evidence and quantitative analysis of the biodegradation process of cellulose, and is beneficial to a better understanding of the cellulose degradation mechanism. |
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Keywords: | Anaerobic degradation Kinetics Micro-scale structure Microcrystalline cellulose (MCC) Crystallinity (CrI) |
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