title: Hydrolysis of wheat B-starch and characterisation of acetylated maltodextrin.
abstract: Wheat B-starch was hydrolysed by α-amylase "Liquozyme supra" from Bacillus licheniformis at 90 °C and pH 7. After 2 h, the dextrose equivalent was 18; according to size exclusion chromatography, however, the hydrolysate contained not only dominant malto-oligosaccharides with the degree of polymerisation (DP)<10 but also more than 20% of components with DP higher than 40. The product was acetylated to a high degree as verified by FTIR and (1)H NMR (degree of substitution DS=3.1); nevertheless, detailed analysis of the MALDI-TOF mass spectra of the product showed that most of the malto-oligosaccharides molecules contained one or two residual hydroxyls. Size exclusion chromatography confirmed that the acetylated maltodextrin still contained a significant part with DP>40. This non-uniformity of acetylated maltodextrin, both with respect to DP and to DS, must be taken into account in the development of acetylated-maltodextrin applications such as use as plasticisers or compatibilisers in biodegradable composites.
authors.affiliation: Institute of Chemical Technology, Department of Carbohydrates and Cereals, Technická 5, 166 28 Prague 6, Czech Republic.
authors.forename: Petra
authors.initials: P
authors.lastname: Smrčková
authors.forename: Jiří
authors.initials: J
authors.lastname: Horský
authors.forename: Evžen
authors.initials: E
authors.lastname: Šárka
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Koláček
authors.forename: Miloš
authors.initials: M
authors.lastname: Netopilík
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Walterová
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Kruliš
authors.forename: Andrey
authors.initials: A
authors.lastname: Synytsya
authors.forename: Kateřina
authors.initials: K
authors.lastname: Hrušková
mesh_terms: D000107:Acetylation; D006868:Hydrolysis; D007700:Kinetics; D008970:Molecular Weight; D011134:Polysaccharides / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D014908:Triticum / Q000737:chemistry*
chemical_list: D011134:Polysaccharides; C008315:maltodextrin; D013213:Starch
keywords: Acetylated maltodextrin; Uniformity; Wheat B-starch; α-Amylase