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Copyright of Science & Technology of Food Industry is the property of Science & Technology of Food Industry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Biobutanol can be used as a new generation of renewable green energy due to its similar energy density, heat of vaporization, air fuel ratio and octane number to gasoline. However, in the process of biological fermentation, the yield of n-butanol is low due to the poor strain performance. So based on the modification of cellulose by bacteria (Clostridium cellulovorans adhE2) strains for fermentation, different ratio of glucose and xylose as the substrate for fermentation kinetics research. The results showed that when the ratio of glucose and xylose was 1: 1, the utilization rate of glucose and xylose was relatively high and the butanol yield (0. 097 g/ g) was the highest, and the butanol yield could be increased by expanding the culture scale with fermentation tank. The results have some significance for the long-term stable operation of repeated batch fermentation and the further metabolic transformation of the s train in the future. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The hydrolysis of rice straw into xylose and glucose in dilute sulfuric acid aqueous solution was studied with a two-step process in batch autoclave reactor. The results showed that compared with the traditional one-step acid hydrolysis, both xylose and glucose could be produced in high yields from rice straw by using the two-step acid hydrolysis process. The effects of reaction temperature, reaction time, the amount of rice straw and acid concentration on the hydrolysis of rice straw were systematically studied, and showed that except initial rice straw loading amount, the other parameters had remarkable influence on the products distribution and yields. In the first-step of the hydrolysis process, a high xylose yield of 162.6 g·kg-1 was obtained at 140℃ after 120 min reaction time. When the solid residues from the first step were subjected to a second-step hydrolysis, a glucose yield as high as 216.5 g·kg-1 could be achieved at 180℃ after 120 min. This work provides a promising strategy for the efficient and value-added utilization of agricultural wastes such as rice straw. [ABSTRACT FROM AUTHOR]