Tannins: Therapeutic Analysis

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Introduction Tannins, a natural compound produced by many plants, have become a common topic when discussing various beverages and fruits, yet the truth is that tannins are compounds that can be found in most all plants and have a much more involved significance than astringent taste. Tannins are a type of plant product that is classified as a polyphenol (Cornell University 2014). Polyphenols, also referred to as phenolic compounds, can have a high molecular weight due to the attachment of one or many hydroxyl groups to an aromatic ring structure (Balasundram 2006). Phenolic compounds can commonly be found connected to single and complex sugars within plants (Balasundram 2006). There is a vast diversity within the plant polyphenols as related to composition, yet polyphenols are categorized into 12 different classes based on structure (Balasundram 2006). Tannins along with …show more content…

Phytochemists have been able to identify a large number of different hydrolysable and condensed tannins. Examples of hydrolysable tannins include galloyl glucoses (GGs), also referred to as gallotannins (GTs), and ellagitannins (ETs) (Barbehenn and Constabel 2011). Hydrolyzable tannins exist within 15 orders of the dicotyledons; moreover, these tannins have a “more restricted occurrence” in plant species when compared to that of condensed tannins (Hattenschwiler and Vitousek 2000). The condensed tannins are even further categorized into many different sub-types pertaining to the compounds structure and linkages of their flavonoid groups (Barbehenn and Constabel 2011). Plant species with secondary or woody growth have been found to contain generous amounts of condensed tannins (Hattenschwiler and Vitousek 2000). Conversely, these condensed tannins are generally absent within the herbaceous plants (Hattenschwiler and Vitousek 2000).

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