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Extra resources for Die Chemie der Natürlichen Gerbstoffe
Example text
Dem Filtrat kann der Gerbstoff unter Umständen mit ÄtherAlkohol 3), Essigäther 4) oder Methyläthylketon entzogen werden. Oder es wird die Hauptmenge des Gerbstoffes mit mehr neutralem Bleiacetat gefällt. Die freiwerdende Essigsäure verhindert jedoch eine vollständige Ausfällung. Führt neutrales Bleiacetat nicht zum Ziele, so ist eine heiße Lösung von basischem Bleiacetat zu verwenden. Ersterem Fällungsmittel ist aber, wenn irgend möglich, der Vorzug zu geben, da von basischem Acetat verschiedene Zucker z.
Wie aus der Struktur dieser Verbindung °. /9H. co . C6H 2(OHh CH·OH / °'" I CH· OH "'bH I CH·OH I CH 20H ersichtlich ist, beteiligt sich auch hier die Carbonylgruppe der Glucose an der Bindung. Die 1-Galloylglucose kann demnach mit den Glucosiden, mit denen sie die Empfindlichkeit gegen Säuren teilt, in eine Reihe gestellt werden. Anders liegen die Verhältnisse, wenn die saure Komponente mit alkoholischen Hydroxylen verknüpft, d. h. verestert ist. Die außerordentliche Säurebeständigkeit, zumal der GallussäureZuckerester, also der Gerbstoffe der Tanningruppe, ist der hauptsächliche Grund, weshalb ihre Konstitution so lange im Dunkeln blieb.
Führt neutrales Bleiacetat nicht zum Ziele, so ist eine heiße Lösung von basischem Bleiacetat zu verwenden. Ersterem Fällungsmittel ist aber, wenn irgend möglich, der Vorzug zu geben, da von basischem Acetat verschiedene Zucker z. B. Mannose5 ), oder viele andere Beimengungen, z. B. Äsculin 6 ) (Diglucosid des Äsculetins, eines Dioxycumarins) gefällt werden. Mit ammoniakalischem Bleiacetat werden vollends die meisten Zucker gefällt, desgleichen, aus alkoholischer Lösung, durch zahlreiche Bleisalze.