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Enhanced ethanol and chitosan production from wheat straw by Mucor indicus with minimal nutrient consumption

Paper ID Volume ID Publish Year Pages File Format Full-Text
34549 45033 2013 8 PDF Available
Title
Enhanced ethanol and chitosan production from wheat straw by Mucor indicus with minimal nutrient consumption
Abstract

•Application of fungal extract for efficient bioethanol production from wheat straw.•A rich nutrient supplement was produced by autolysis using Mucor indicus biomass.•Fungal extract can successfully replace all required nutrients for fermentation.•Straw hydrolysis yield was enhanced at least by 6-fold using NMMO pretreatment.

Recently, Mucor indicus was introduced as a promising ethanol producing microorganism for fermentation of lignocellulosic hydrolysates, showing a number of advantages over Saccharomyces cerevisiae. However, high nutrient requirement is the main drawback of the fungus in efficient ethanol production from lignocelluloses. In this study, application of fungal extract as a potential nutrient source replacing all required nutrients in fermentation of wheat straw by M. indicus was investigated. Wheat straw was pretreated with N-methylmorpholine-N-oxide (NMMO) at 120 °C for 1–5 h prior to enzymatic hydrolysis. Hydrolysis yield was improved at least by 6-fold for 3 h pretreated straw compared with that of untreated one. A fungal extract was produced by autolysis of M. indicus biomass, an unavoidable byproduct of fermentation. Maximum free amino nitrogen (2.04 g/L), phosphorus (1.50 g/L), and total nitrogen (4.47 g/L) as well as potassium, magnesium, and calcium in the fungal extract were obtained by autolysis of the biomass at 50 °C and pH 5.0. The fungal extract as a nutrient-rich supplement substituted yeast extract and all other required minerals in fermentation and enhanced the ethanol yield up to 92.1% of the theoretical yield. Besides, appreciate amounts of chitosan were produced as another valuable product of the autolysis.

Keywords
Fungal extract; Mucor indicus; N-methylmorpholine-N-oxide (NMMO); Pretreatment; Wheat straw
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Enhanced ethanol and chitosan production from wheat straw by Mucor indicus with minimal nutrient consumption
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 48, Issue 10, October 2013, Pages 1524–1531
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