AI Article Synopsis
- Global grape production results in significant waste, with up to 13 million tons of grape marc generated each year, which is being explored as a potential source for biofuel.
- The analysis of Cabernet Sauvignon and Sauvignon Blanc grape marc shows that it is rich in carbohydrates, with a considerable portion being soluble in water, and contains valuable compounds like polyphenols and cellulose.
- Pre-treatments, such as sulfuric acid, can enhance the extraction of glucose for bioethanol production, projecting a potential yield of up to 400 liters of bioethanol per ton of grape marc, while also producing a byproduct that could be used for animal feed or fertilizer.
Article 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 0.5M 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.
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| http://dx.doi.org/10.1016/j.biortech.2015.06.030 | DOI Listing |
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