Sustainable Biofuels and Co Products Research Unit

Wyndmoor, PA, United States

Sustainable Biofuels and Co Products Research Unit

Wyndmoor, PA, United States

Time filter

Source Type

Nghiem N.P.,Sustainable Biofuels and Co Products Research Unit | Kim T.H.,Kongju National University | Yoo C.G.,Iowa State University | Hicks K.B.,Sustainable Biofuels and Co Products Research Unit
Applied Biochemistry and Biotechnology | Year: 2013

Barley straw was used to demonstrate an integrated process for production of fuel ethanol and astaxanthin as a value-added co-product. Barley straw was pretreated by soaking in aqueous ammonia using the previously determined optimum conditions, which included 77.6 C treatment temperature, 12.1 h treatment time, 15 wt% ammonia concentration, and 1:8 solid-to-liquid ratio. In the newly developed process, the pretreated barley straw was first hydrolyzed with ACCELLERASE® XY (a commercial hemicellulase product) to generate a xylose-rich solution, which contained 3.8 g/l glucose, 22.9 g/l xylose, and 2.4 g/l arabinose, with 96 % of the original glucan being left intact. The xylose-rich solution was used for production of astaxanthin by the yeast Phaffia rhodozyma without further treatment. The resulting cellulose-enriched solid residue was used for ethanol production in a fed-batch simultaneous saccharification and fermentation using ACCELLERASE® 1500 (a commercial cellulase product) and the industrial yeast Saccharomyces cerevisiae. At the end of the fermentation, 70 g/l ethanol was obtained, which was equivalent to 63 % theoretical yield based on the glucan content of the solid substrate. © 2013 Springer Science+Business Media New York (outside the USA).


Yadav M.P.,Sustainable Biofuels and Co Products Research Unit | Hicks K.B.,Sustainable Biofuels and Co Products Research Unit
Carbohydrate Polymers | Year: 2015

Both barley hulls and straw contain valuable arabinoxylans and other useful carbohydrate and non-carbohydrate components. The functional water soluble non-caloric arabinoxylan (hemicellulose B) fraction was isolated from hot water-extracted and de-starched barley hulls and straws by an alkaline hydrogen peroxide extraction followed by ethanol precipitation. Barley hulls contained comparatively more Hemi. B (20.51%) than barley straws (7.41 to 12.94%). The sugar composition of Hemi. B showed that they were typical arabinoxylans containing (in addition to arabinose and xylose) some galactose, glucose and acidic sugars in the side chains. The hemicellulose B fractions from barley straws were superior oil-in-water emulsifiers than those from barley hulls. These Hemi. B fractions contain protein, which contributes to their emulsions stabilizing property. © Published by Elsevier Ltd.

Loading Sustainable Biofuels and Co Products Research Unit collaborators
Loading Sustainable Biofuels and Co Products Research Unit collaborators