Zusammenfassung
Der Gehalt an Gesamtgerbstoffen, Proanthocyanidinen und Prototanninen im Samen von Guarana,Paullinia cupana var.sorbilis HKB (Sapindaceae), wurde untersucht. In lufttrockenen Samen wurde ein Gesamttanningehalt von 12,1% i. T. gefunden, die Proanthocyanidin-Bestimmung ergab einen Gehalt von 10,7%; mittels RP-HPLC-Analyse wurden 6,0% an (+)-Catechin und 3,8% (−)-Epicatechin gefunden. Hydrolysierbare Tannine waren nicht nachweisbar. Bei einer von zwei untersuchten gemahlenen Proben des brasilianischen Handels waren alle Analysenwerte erheblich erniedrigt, was auf eine Streckung des Produkts mit nicht gerbstoffhaltigem Material schließen läßt.
Summary
The content of the total tannins, proanthocyanidins and prototannins in the seeds of guarana, Paullinia cupana var. sorbilis HKB (Sapindaceae) was studied. A total tannin content of 12.1% dry matter was found in air dried samples. Reversed-phase high-performance liquid chromatography (RP-HPLC) analysis resulted in 6.0% (+)-catechin and 3.8% (−)-epicatechin on an average. Hydrolysable tannins were not detectable. The results for one of two analyzed ground samples from the Brazilian market were substantially lowered. It is concluded that this product was adulterated with another no tannin containing material.
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Marx, F. Analysis of guarana seeds II. Studies on the composition of the tannin fraction. Z Lebensm Unters Forch 190, 429–431 (1990). https://doi.org/10.1007/BF01202562
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DOI: https://doi.org/10.1007/BF01202562