Tannins are water-soluble polyphenols that are present in many plant foods. It can be found in the seeds, roots, leaves, stem tissues, and bark of plants. In all of these plant structures, tannins help protect the individual plant species. Moreover, tannins protect the tree from being infected by bacteria or fungi. Fruits such as blueberries, cranberries, strawberries, walnuts, hazelnuts, grapes, oranges, and?pecans have rich content of tannin. Due to anti-oxidation properties and the decomposition, tannins are extensively used in various end-use industries, such as wine, leather, and wood adhesives.
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