title: Isolation of barley hulls and straw constituents and study of emulsifying properties of their arabinoxylans.
abstract: 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.
authors.affiliation: Sustainable Biofuels and Co-Products Research Unit, Eastern Regional Research Center, Agricultural Research Service, USDA, 600 East Mermaid Lane, Wyndmoor, PA 19038, United States. Electronic address: madhav.yadav@ars.usda.gov.
authors.forename: Madhav P
authors.initials: MP
authors.lastname: Yadav
authors.affiliation: Sustainable Biofuels and Co-Products Research Unit, Eastern Regional Research Center, Agricultural Research Service, USDA, 600 East Mermaid Lane, Wyndmoor, PA 19038, United States.
authors.forename: Kevin B
authors.initials: KB
authors.lastname: Hicks
mesh_terms: D002482:Cellulose / Q000737:chemistry / Q000302:isolation & purification; D045703:Emulsifying Agents / Q000737:chemistry*; D001467:Hordeum / Q000737:chemistry / Q000378:metabolism*; D008031:Lignin / Q000737:chemistry / Q000302:isolation & purification; D009821:Oils / Q000737:chemistry; D009844:Oligosaccharides / Q000737:chemistry / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014990:Xylans / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D045703:Emulsifying Agents; D009821:Oils; D009844:Oligosaccharides; D010936:Plant Extracts; D014990:Xylans; C438402:hemicellulose B; D014867:Water; D002482:Cellulose; D008031:Lignin; C085118:arabinoxylan
keywords: Barley hulls; Barley straws; Emulsifier; Emulsifying activity; Emulsion stability; Oil-in-water emulsion