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    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 31P 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.


    Lili Zhen, Heiko Lange, Claudia Crestini. An Analytical Toolbox for Fast and Straightforward Structural Characterisation of Commercially Available Tannins. Molecules (Basel, Switzerland). 2021 Apr 26;26(9)

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    PMID: 33926135

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