In this article:
It is known that the skins, seeds and vascular tissue contain the bulk of the polyphenolic compounds present in ripe grape berries, however a simple chemical staining technique for these compounds in grapes has not previously been described adequately.
This article provides detail of a technique for the chemical staining of polyphenolic compounds using vanillin-HC1.
Results from testing of the technique on several varieties of Vitis vinfera are discussed.
A Simple Method for Demonstrating Macroscopically the Location of Polyphenolic Compounds in Grape Berries
1972, Sonderdruck aus der Zeitschrift ‘Vitis’, vol 11, pages 198 – 192
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