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Subcritical water and dilute acid pretreatments for bioethanol production from Melaleuca leucadendron shedding bark

Paper ID Volume ID Publish Year Pages File Format Full-Text
3322 164 2013 9 PDF Available
Title
Subcritical water and dilute acid pretreatments for bioethanol production from Melaleuca leucadendron shedding bark
Abstract

•Bioethanol production from shedding bark of Melaleuca leucadendron (Paper bark tree).•Sub-critical water pretreated biomass yielded glucan solubilization of 85%.•Complete glucan solublization achieved at optimum dilute acid condition.•Glucose to ethanol conversion rate of 0.475 g g−1 (91% ethanol yield).

The feasibility of bioethanol production using the lignocellulose of the shedding bark of Melaleuca leucadendron (Paper bark tree) was investigated. The effects of pretreatment parameters (temperature, time and acid concentration) on the yields of sugars and inhibitors, and optimal pretreatment conditions were determined. At very low severity conditions (combined severity factor, CSF ≤ 0.335), 28% of xylan was recovered and this recovery increased with increasing CSF till it peaked to 64.4% (11.2 g xylose L−1) at a CSF of 1.475. However, at CSF > 2.0, xylose yield declined due to degradation. Mild and progressive glucose yield was detected in prehydrolysate at CSF ≥ 1.514, and subsequent enzymatic hydrolysis allowed complete glucan solubilization. Implementing environmentally friendly subcritical water pretreatment at CSF ≤ 0.335 on the shedding bark, about 85% of glucan solubilization was achieved after enzymatic hydrolysis. An industrial Saccharomyces cerevisiae strain readily fermented crude hydrolysate within 12 h, yielding 24.7 g L−1 ethanol at an inoculum size of 2% (v/v), representing a glucose to ethanol conversion rate of 0.475 g g−1 (91% ethanol yield). Based on our findings, the shedding bark is a potential feedstock for bio-ethanol production.

Keywords
Glucose; Cellulase; Fermentation; Ethanol; Subcritical water; Melaleuca leucadendron
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Subcritical water and dilute acid pretreatments for bioethanol production from Melaleuca leucadendron shedding bark
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 78, 15 September 2013, Pages 44–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us