Hydroxyethyl starches were prepared by reaction of potato and corn starches with ethylene oxide. The degree of substitution (DS) was determined by the acetylation method and was 0.02 to 0.20 per glucose unit. Determination of position of the alkoxyl groups by thin layer chromatography indicates that 85% of the groups were attached to C2. Periodic oxidation of the hydroxyethyl starch indicated decrease with the increase of DS due to the resistance of C2-3 substituted glycol to cleavage. The iodine adsorption decreased with increasing DS. Therefore iodine adsorption could be taken as a measure of the degree of modification of starch molecule. Darstellung und Beurteilung von Hydroxyethylstarke. Durch Reaktion von Kartoffel-und Maisstarken mit Ethylenoxid wurden Hydroxyethylstarken dargestellt. Der Substitutionsgrad (DS) wurde durch die Acetylierungsmethode bestimmt und lag zwischen 0,02 und 0,20 je Glucoseeinheit. Die Bestimmung der Stellung der Alkoxylgruppen durch Diinnschichtchromatographie zeigte, dalj 85% der Gruppen an das C-Atom 2 gebunden waren. Die Periodoxidation der Hydroxyethylstarke nahm mit zunehmendem DS ab, entsprechend dem Widerstand der bei der Spaltung zwischen C 2 und C3 substituierten Glykolgruppierungen. Die Iodaasorption verminderte sich ebenfalls mit steigendem DS. Daher kann sie als Ma0 fur den Modifizierungsgrad der Stlrke herangezogen werden. ): Effect 01 germination on physico-chemical and bread-baking properties of yellow pea, lentil, and faba bean flours and starches (EinfluB der Keimung auf die physikochemischen und Brot-Backeigenschaften von gelben Erbsen-, Linsen-und Faba-Bohnenmehlen und -starken). Cereal Chem. 57 (1980), 390-6 (Eng.). Lundry, J.; Moureaux, T. (Inst. Nat. Recherche Agr., Lab. d'Etude des Proteines, Versailles, France) : Distribution and amino acid composition of protein groups located in different histological parts of maize grain (Verteilung und Aminosaure-Zusammensetzung von Proteinfraktionen in verschiedenen histologischen Teilen des Maiskorns). J . Agr. Food Chem. 28 (1980), 1186-91 (Eng.). Meuser, I;. ; Smolnik, H.-D. (Inst. Lebensmitteltechnol. Getreidetechnol., Tech. Univ., Berlin, Ger.): Application of the membrane filter technique for the processing of waste water in wheat starch production (Anwendung der Membranfiltrationstechnik zur Aufarbeitung des ProzeBwassers bei der Weizenstarkegewinnung). Schriftenreihe Tech. Univ., Berlin, Fachgeb. Getreidetechnol. (1979), 1-98 (Ger.). Nakayama, T.; Ogawu, T.; Shinkai, K.; Skoji, K. (Nihon Nosan Kogyo K. K., Yokohama, Japan): Method of quick gelatinization of starch (Eine Methode zur schnellen Verkleisterung von Starke). Nihon Nosan Kogyo Kenkyu Nempo 9 (1979), 89-99 (Japan.). Mishler, J . M . ; Ricketts, C. R.; Parkhouse, E. J.; Borberg, H.; Gross, R. (Med. Universitatsklinik, Koln, Ger.): The catabolism of low molecular weight hydroxyethylated amylopectin in man. II. Changes in the urinary molecular profile (Der Katabolismus von Hydroxy-
Viscosity and gelatinization characteristics of corn and potato starches as well as their hydroxyethyl derivatives were investigated. The inherent viscosity increased from 164 in native corn starch to 209 in etherified one of DS 0.18. The etherified corn starch gelatinized at lower temperature than nativecorn starchdue to theirincreaseofDS. Maximum viscosity decreased from 93°C to 69°C for the modified corn starch. The retrogradation of starch was minimized by etherification as retrogradation ability of corn starch from its solution decrease from 22% to 6%. This is of great importance when starch is used as blood plasma volume expander. Variable results were obtained with etherified potato starch which might be due to its high contents of phosphorus.
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