The extraction of wheat starch with ethanol reduced the protein content from 0.4 to 0.3%. Wheat starch extracted with 1% SDS containing 1% 2‐ME or with 1% SDS gave no staining with amido black, indicating that most of starch surface protein has been separated. TLC of lipids extracted from starch without gelatinization showed that ethanol extracted considerable amounts of starch lipids such as lysophosphatidyl choline, lysophosphatidyl ethanolamine and free fatty acids. After extraction with SDS and especially with SDS + 1% 2‐ME only some starch granules were deformed. In this starch some changes have been observed also on the granules surface by REM. The extraction resulted also in considerable changes in rheological properties of extracted starches. The starch samples were characterized thermodynamically also.
Weizenkleber kann in nativer Form aufgrund seiner strukturbedingten Eigenschaften nicht für technische Applikationen genutzt werden. Aus diesem Grunde muß der Kleber durch chemische Methoden so aufgearbeitet werden, daß er den gewünschten technischen Anforderungen entspricht. Aufarbeitungsverfahren, Einflußgrößen sowie papiertechnische Anforderungen hinsichtlich eines Einsatzes von Weizenkleber in Papierstreichfarben sind Gegenstand dieses Artikels. So konnte durch unsere Untersuchungen gezeigt werden, daß chemisch modifizierter Weizenkleber als Cobindemittel in Papierstreichfarben eingesetzt werden kann, da er in einigen wichtigen technischen Eigenschaften, wie dem Fließverhalten, der Rupffestigkeit sowie des Wasserrückhaltevermögens, sich gegenüber einem industriellen Standard‐Cobindemittel gleichwertig oder sogar teil‐weise überlegen erweist.
The method of Differential Scanning Calorimetry (DSC) was used to study the thermal behavior of wheat gluten in the temperature range from 30–200 C. The relation between the amount of gluten and the heating rate on the thermal transition effects was the purpose of the present study. Therefore, the amount of gluten and also the heating rate were systematically changed to get informations about the scanning parameters and the corresponding signals.
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