Abstract
Global grape production could generate up to 13. Mt/yr of wasted biomass. The compositions of Cabernet Sauvignon (red marc) and Sauvignon Blanc (white marc) were analyzed with a view to using marc as raw material for biofuel production. On a dry weight basis, 31-54% w/w of the grape marc consisted of carbohydrate, of which 47-80% was soluble in aqueous media. Ethanol insoluble residues consisted mainly of polyphenols, pectic polysaccharides, heteroxylans and cellulose. Acid and thermal pre-treatments were investigated for their effects on subsequent cellulose saccharification. A 0.5. M sulfuric acid pre-treatment yielded a 10% increase in the amount of liberated glucose after enzymatic saccharification. The theoretical amount of bioethanol that could be produced by fermentation of grape marc was up to 400. L/t. However, bioethanol from only soluble carbohydrates could yield 270. L/t, leaving a polyphenol enriched fraction that may be used in animal feed or as fertilizer.
Original language | English |
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Pages (from-to) | 76-83 |
Number of pages | 8 |
Journal | Bioresource Technology |
Volume | 193 |
DOIs | |
State | Published - Oct 1 2015 |
Bibliographical note
Publisher Copyright:© 2015.
Keywords
- Bioethanol
- Grape marc
- Polysaccharide
- Pre-treatment
- Saccharification
ASJC Scopus subject areas
- Bioengineering
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal