An Analytical Toolbox for Fast and Straightforward Structural Characterisation of Commercially Available Tannins

Both condensed and hydrolysable tannins represent versatile natural polyphenolic structures exhibiting a broad range of activities that could be exploited in various fields including nutraceutics, cosmesis, consumer care, household and pharmaceutical applications. Various tannins are commercially available nowadays for use in such application fields. We have analysed a representative selection of commercially available condensed and hydrolysable tannins for structural features and purity. Using a combination of quantitative P-31 NMR spectroscopy, HSQC measurements, MALDI-ToF analyses, gel permeation chromatography and wet chemical analysis, detailed structural characterisations and descriptions were possible, allowing for verification and falsification of claimed structural features.

Automated summary

Both condensed and hydrolysable tannins are versatile natural polyphenolic structures with various activities that can be used in different fields. Researchers have analyzed a selection of commercially available tannins for their structural features and purity using a combination of analytical techniques, ensuring the accuracy of the claimed features.