title: Biochemical heterogeneity of malt is caused by both biological variation and differences in processing: I. Individual grain analyses of biochemical parameters in differently steeped barley (Hordeum vulgare L.) malts.
abstract: Using individual grain analyses, the degree of inherent biological variation in germinating barley seeds has been established. Even under homogenous laboratory conditions, the activities of the germination-related enzymes α-amylase, β-amylase and β-glucanase varied by a factor of two to three. The comparison with single grain analyses of different industrially produced malts (steeping systems without aeration, with air suction and pressurised aeration) revealed that the heterogeneity of these malts nearly tripled. This increase may be due to the gradients in O2 and CO2 that arise in large industrial steeping vessels. The most homogenous malting in the industrial systems was achieved without any aeration during steeping. Therefore, to improve homogeneity, the common practise of steep aeration should be omitted. Germination progression was quite different within the three exhaustively aerated attempts, which indicated that gaseous composition was not the only factor affecting germination progression.
authors.affiliation: Institut für Pflanzenbiologie, Technische Universität Braunschweig, Mendelssohnstraße 4, D-38106 Braunschweig, Germany. Electronic address: m.kleinwaechter@tu-bs.de.
authors.forename: Maik
authors.initials: M
authors.lastname: Kleinwächter
authors.forename: Christian
authors.initials: C
authors.lastname: Müller
authors.forename: Frank-Jürgen
authors.initials: FJ
authors.lastname: Methner
authors.forename: Dirk
authors.initials: D
authors.lastname: Selmar
mesh_terms: D005511:Food Handling / Q000379:methods*; D018525:Germination; D001467:Hordeum / Q000737:chemistry* / Q000201:enzymology / Q000502:physiology; D010940:Plant Proteins / Q000032:analysis; D000516:alpha-Amylases / Q000032:analysis; D001614:beta-Amylase / Q000032:analysis
chemical_list: D010940:Plant Proteins; D000516:alpha-Amylases; D001614:beta-Amylase
keywords: Biochemical homogeneity; Hordeum vulgare L.; Malting; Steep aeration