Public Release: 

Reject watermelons -- the newest renewable energy source

BioMed Central

Watermelon juice can be a valuable source of biofuel. Researchers writing in BioMed Central's open access journal Biotechnology for Biofuels have shown that the juice of reject watermelons can be efficiently fermented into ethanol.

Wayne Fish worked with a team of researchers at the USDA-Agricultural Research Service's South Central Agricultural Research Laboratory in Lane, Oklahoma, US, to evaluate the biofuel potential of juice from 'cull' watermelons - those not sold due to cosmetic imperfections, and currently ploughed back into the field. He said, "About 20% of each annual watermelon crop is left in the field because of surface blemishes or because they are misshapen. We've shown that the juice of these melons is a source of readily fermentable sugars, representing a heretofore untapped feedstock for ethanol biofuel production".

As well as using the juice for ethanol production, either directly or as a diluent for other biofuel crops, Fish suggests that it can be a source of lycopene and L-citrulline, two 'nutraeuticals' for which enough demand currently exists to make extraction economically worthwhile. After these compounds have been removed from the 'cull' juice, it can still be fermented into ethanol.

The researchers conclude, "At a production ratio of ~0.4 g ethanol/g sugar, as measured in this study, approximately 220 L/ha of ethanol would be produced from cull watermelons".

###

Notes to Editors

1. Watermelon juice: a promising feedstock supplement, diluent, and nitrogen supplement for ethanol biofuel production
Wayne W Fish, Benny D Bruton and Vincent M Russo
Biotechnology for Biofuels (in press)

During embargo, article available here: http://www.biotechnologyforbiofuels.com/imedia/5738127922611380_article.pdf?random=642645

After the embargo, article available at journal website: http://www.biotechnologyforbiofuels.com/

Please name the journal in any story you write. If you are writing for the web, please link to the article. All articles are available free of charge, according to BioMed Central's open access policy.

Article citation and URL available on request at press@biomedcentral.com on the day of publication

2. Biotechnology for Biofuels is an open access, peer-reviewed online journal featuring high-quality studies describing technological and operational advances in the production of biofuels from biomass. Biotechnology for Biofuels emphasizes understanding and advancing the application of biotechnology and synergistic operations to improve plants and biological conversion systems for the production of fuels from lignocellulosic biomass and any related economic, environmental and policy issues.

3. BioMed Central (http://www.biomedcentral.com/) is an STM (Science, Technology and Medicine) publisher which has pioneered the open access publishing model. All peer-reviewed research articles published by BioMed Central are made immediately and freely accessible online, and are licensed to allow redistribution and reuse. BioMed Central is part of Springer Science+Business Media, a leading global publisher in the STM sector.

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.