title: Impact of flavouring substances on the aggregation behaviour of dissolved barley β-glucans in a model beer.
abstract: Structural polymers such as cereal β-glucan may cause various processing problems in beverage industry depending on concentration, molar size distribution and agglomeration behaviour. In this context, influences of the beer volatiles dodecanoic acid, octyl butanoate, ethyl decanoate and decyl acetate on molar mass and radii of barley β-glucan were investigated in ethanolic (4% w/w) model solution. After addition of 100mg/l ethyl decanoate and decyl acetate to the β-glucan solution, a wider-ranging molar mass distribution could be observed by means of asymmetric field-flow-fractionation. Due to agglomeration, average molar mass of β-glucan standard (MW=6.8×10(6)g/mol) increased by 2×10(6)g/mol (P<0.05) in solution containing decyl acetate. Furthermore, a significant growth (P<0.05) from 86 to 102 nm in gyration radius was measured. The obtained results elucidate the importance of fatty acid derived flavouring substance composition in beer regarding the aggregation behaviour of β-glucan.
authors.affiliation: Lehrstuhl für Brau- und Getränketechnologie, Technische Universität München, Weihenstephan, Weihenstephaner Steig 20, 85354 Freising, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Kupetz
authors.affiliation: Lehrstuhl für Brau- und Getränketechnologie, Technische Universität München, Weihenstephan, Weihenstephaner Steig 20, 85354 Freising, Germany. Electronic address: B.Sacher@mytum.de.
authors.forename: B
authors.initials: B
authors.lastname: Sacher
authors.affiliation: Lehrstuhl für Brau- und Getränketechnologie, Technische Universität München, Weihenstephan, Weihenstephaner Steig 20, 85354 Freising, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Becker
mesh_terms: D001515:Beer; D004952:Esters; D005421:Flavoring Agents / Q000737:chemistry*; D001467:Hordeum; D057927:Hydrophobic and Hydrophilic Interactions; D007850:Lauric Acids / Q000737:chemistry; D014783:Viscosity; D047071:beta-Glucans / Q000032:analysis / Q000737:chemistry*
chemical_list: D004952:Esters; D005421:Flavoring Agents; D007850:Lauric Acids; D047071:beta-Glucans; C030358:lauric acid
keywords: Asymmetric flow-field-flow-fractionation; Beer; Hydrocolloid; Molar mass; Viscosity