Distribution of Hydroxyethyl Groups in Commercial Hydroxyethyl Starch

Srivastava, H. C.; Ramalingam, Kondareddiar

doi:10.1002/star.19670190905

Cited by 25 publications

(3 citation statements)

References 14 publications

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“…These results may explain the greater ability of corn starch to etherification than of potato starch which contains more phosphate esters as described before. These results are in good agreement with those obtained by Srivastava and Ramalingam [3]. They found that the maximum periodate consumption obtained with hydroxyethyl starch of about 0.1 DS was 0.89 mole per glucose unit while the unmodified corn starch consumed 0.976 mole.…”

Section: Periodate Oxidation Of Native and Etherified Starchessupporting

confidence: 91%

“…The unsubstituted hydroxyl groups in the prepared hydroxyethyl starches were determined using the acetylation method [7], and the degree ofsubstitution was calculated. Suspensions ofthe testedsamplesin water andacetate buffer at pH 3.9were treated with sodium metaperiodate and the periodate consumption was determined after 13 days [3]. The starch material was hydrolysed by H2SO4 [8] and the hydrolysate was investigated by thin layer chromatography [9].…”

Section: Methodsmentioning

confidence: 99%

“…Hydroxyethyl starches are produced by reacting starch with ethylene oxide in the presence of an alkaline catalyst [I, 21. Hydroxyethyl starches of low degree of substitution are the most suitable for numerous industrial [3] and medical purposes [4, 51. The present study aims to investigate the preparation of low substituted hydroxyethyl starch. Detailed objectives are focused on the chemical procedure for the preparation of these derivatives.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Evaluation of Hydroxyethyl Starch

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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-

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Section: Periodate Oxidation Of Native and Etherified Starchessupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and Evaluation of Hydroxyethyl Starch

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Crosslinking statistics, 2. Relative reactivities of amylose hydroxyl groups

Luby

Kuniak

1979

Makromol. Chem.

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Reproducibility of crosslink distribution in polysaccharides crosslinking depends on the homogeneity of the reaction mixture. If the condition of reaction homogeneity is met, the distribution of substituents (or crosslinks) should directly determine the relative reactivities of the functional groups. The resulting molecular size distribution of fragments of monosaccharide units connected by crosslinks in such a case should be given by the statistical laws of network formation. This principle is exemplified on amylose crosslinked by epichlorohydrin in a homogeneous water-alkali medium. The relative reactivities of functional groups are investigated in two ways: 1) by specific reactions; 2) calculated theoretically from the molecular size distribution of fragments of crosslinked glucose units. Good agreement of both results supported the above mentioned assumptions. The reactivity of amylose hydroxyls increases strongly in the order OH-3

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