Study of sugarcane pieces as yeast supports for ethanol production from sugarcane juice and molasses |
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Authors: | Lei Liang Yuan-ping Zhang Li Zhang Ming-jun Zhu Shi-zhong Liang Yu-nan Huang |
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Institution: | (1) School of Bioscience and Bioengineering, South China University of Technology, 510006 Guangzhou, People’s Republic of China;(2) Guangdong Key Laboratory of Sugarcane Improvement and Biorefinery, Guangzhou Sugarcane Industry Research Institute, 510316 Guangzhou, People’s Republic of China |
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Abstract: | Due to the environmental concerns and the increasing price of oil, bioethanol was already produced in large amount in Brazil
and China from sugarcane juice and molasses. In order to make this process competitive, we have investigated the suitability
of immobilized Saccharomyces cerevisiae strain AS2.1190 on sugarcane pieces for production of ethanol. Electron microscopy clearly showed that cell immobilization
resulted in firm adsorption of the yeast cells within subsurface cavities, capillary flow through the vessels of the vascular
bundle structure, and attachment of the yeast to the surface of the sugarcane pieces. Repeated batch fermentations using sugarcane
supported-biocatalyst were successfully carried out for at least ten times without any significant loss in ethanol production
from sugarcane juice and molasses. The number of cells attached to the support increased during the fermentation process,
and fewer yeast cells leaked into fermentation broth. Ethanol concentrations (about 89.73–77.13 g/l in average value), and
ethanol productivities (about 59.53–62.79 g/l d in average value) were high and stable, and residual sugar concentrations
were low in all fermentations (0.34–3.60 g/l) with conversions ranging from 97.67–99.80%, showing efficiency (90.11–94.28%)
and operational stability of the biocatalyst for ethanol fermentation. The results of this study concerning the use of sugarcane
as yeast supports could be promising for industrial fermentations.
L. Liang and Y. Zhang have contributed equally to this work. |
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Keywords: | Saccharomyces cerevisiae Sugarcane Ethanol fermentation Immobilization |
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