Abstract
The different assays used for tannin estimation in plant tissues can be classified into three groups according to the type of reaction involved: precipitation of proteins or alkaloids, reaction with phenolic rings, and depolymerization. The value of these methods for estimation of total tannins or of a particular group of tannins (proanthocyanidins, gallotannins or ellagitannins) is discussed. The importance of careful preparation of the tannin extract, including preparation and storage of the sample, extraction and fractionation of the isolates, is emphasized.
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Scalbert, A. (1992). Quantitative Methods for the Estimation of Tannins in Plant Tissues. In: Hemingway, R.W., Laks, P.E. (eds) Plant Polyphenols. Basic Life Sciences, vol 59. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3476-1_15
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