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Comparison of saccharification and fermentation of steam exploded rice straw and rice husk

Overview of attention for article published in Biotechnology for Biofuels, September 2016
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Title
Comparison of saccharification and fermentation of steam exploded rice straw and rice husk
Published in
Biotechnology for Biofuels, September 2016
DOI 10.1186/s13068-016-0599-6
Pubmed ID
Authors

Ian P. Wood, Ian P. Wood, Huong-Giang Cao, Long Tran, Nicola Cook, Peter Ryden, David R. Wilson, Graham K. Moates, Samuel R. A. Collins, Adam Elliston, Keith W. Waldron

Abstract

Rice cultivation produces two waste streams, straw and husk, which could be exploited more effectively. Chemical pretreatment studies using rice residues have largely focussed on straw exploitation alone, and often at low substrate concentrations. Moreover, it is currently not known how rice husk, the more recalcitrant residue, responds to steam explosion without the addition of chemicals. The aim of this study has been to systematically compare the effects of steam explosion severity on the enzymatic saccharification and simultaneous saccharification and fermentation of rice straw and husk produced from a variety widely grown in Vietnam (Oryza sativa, cv. KhangDan18). Rice straw and husk were steam exploded (180-230 °C for 10 min) into hot water and washed to remove fermentation inhibitors. In both cases, pretreatment at 210 °C and above removed most of the noncellulosic sugars. Prolonged saccharification at high cellulase doses showed that rice straw could be saccharified most effectively after steam explosion at 210 °C for 10 min. In contrast, rice husk required more severe pretreatment conditions (220 °C for 10 min), and achieved a much lower yield (75 %), even at optimal conditions. Rice husk also required a higher cellulase dose for optimal saccharification (10 instead of 6 FPU/g DM). Hemicellulase addition failed to improve saccharification. Small pilot scale saccharification at 20 % (w/v) substrate loading in a 10 L high torque bioreactor resulted in similarly high glucose yields for straw (reaching 9 % w/v), but much less for husk. Simultaneous saccharification and fermentation under optimal pretreatment and saccharification conditions showed similar trends, but the ethanol yield from the rice husk was less than 40 % of the theoretical yield. Despite having similar carbohydrate compositions, pretreated rice husk is much less amenable to saccharification than pretreated rice straw. This is likely to attenuate its use as a biorefinery feedstock unless improvements can be made either in the feedstock through breeding and/or modern biotechnology, or in the pretreatment through the employment of improved or alternative technologies. Physiological differences in the overall chemistry or structure may provide clues to the nature of lignocellulosic recalcitrance.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 85 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 85 100%

Demographic breakdown

Readers by professional status Count As %
Researcher 13 15%
Student > Bachelor 13 15%
Student > Master 8 9%
Student > Ph. D. Student 7 8%
Student > Doctoral Student 6 7%
Other 16 19%
Unknown 22 26%
Readers by discipline Count As %
Agricultural and Biological Sciences 13 15%
Engineering 10 12%
Biochemistry, Genetics and Molecular Biology 8 9%
Chemical Engineering 7 8%
Chemistry 6 7%
Other 10 12%
Unknown 31 36%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 12 September 2016.
All research outputs
#7,232,015
of 8,366,012 outputs
Outputs from Biotechnology for Biofuels
#573
of 680 outputs
Outputs of similar age
#209,908
of 252,579 outputs
Outputs of similar age from Biotechnology for Biofuels
#17
of 19 outputs
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So far Altmetric has tracked 680 research outputs from this source. They receive a mean Attention Score of 4.0. This one is in the 1st percentile – i.e., 1% of its peers scored the same or lower than it.
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We're also able to compare this research output to 19 others from the same source and published within six weeks on either side of this one. This one is in the 1st percentile – i.e., 1% of its contemporaries scored the same or lower than it.