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Antioxidative polyphenols represented by tannins and flavonoids are rich in numerous food sources and traditional natural medicines and currently attracting increased attention in health care and food industries because of their multiple biological activities that are favorable to human health. Commemorating the outstanding achievements on tannins by Dr. Takuo Okuda on the occasion of his passing away in December 2016, his colleagues, friends, and worldwide experts of polyphenol research have contributed 18 papers on their recent study to the Special Issue of Molecules. This book is its reprinted form. This covers reviews of structural features, historical usages, and biological activities of unique class of ellagitannins and condensed tannins, and original articles on the most up-to-date findings on the anticancer effect of green tea catechins, the antivirus effect of tannins comparing with the clinically used drugs, the analytical method of ellagitannins using quantitative NMR, the chemical structures of Hydrangea-blue complex (pigment) and condensed tannins in Ephedra sinica and purple prairie clover, and the relationship of condensed tannins in legumes and grape-marc with methane production in the in vitro ruminant system, and others. This book will be useful to natural product chemists and also to researchers in pharmaceutical and/or food industry.

Coreopsis lanceolata L. --- UV-Vis --- methanogenesis --- Lythraceae --- flavanone --- grape marc --- TDDFT --- Ephedra sinica --- macrocyclic oligomer --- triple-negative breast cancer --- antioxidant --- purple prairie clover --- chalcone --- neuraminidase --- fatty acid synthase --- (?)-epigallocatechin gallate --- epidermal growth factor --- NMR spectroscopy --- Aluminum ion --- Onagraceae --- Hydrangea macrophylla --- synthetic analogues --- blue color development --- amyloid-? peptide --- FTIR --- oseltamivir carboxylate --- quantitative NMR --- phloroglucinolysis --- thin layer chromatography --- European historic leathers --- FASN inhibition --- ECD --- colorimetric tests --- taxanes --- cynandione A --- conservation method --- 5-O-caffeoylquinic acid --- ellagitannin --- PC12 --- condensed tannin --- Trapa taiwanensis Nakai --- 1H-NMR --- Acacia --- (?)-epigallocatechin 3-gallate --- Geranium thunbergii --- condensed tannins --- immunomodulatory effect --- Acacia mearnsii bark --- Escherichia coli --- oligomer --- Horner–Wadsworth–Emmons reaction --- lung tumor --- Aspergillus fumigates --- in vitro batch fermentation --- metal complex --- Myrtaceae --- Cynanchum auriculatum --- molecular interactions --- phenolic glycoside --- bamboo leaf extract --- stability --- Microsporum canis --- Cynanchum wilfordii --- thiolysis --- anti-inflammation --- hydrolysable tannin --- geraniin --- NGF --- polyphenol --- revision --- ESI-mass --- bioactivity --- antifungal activities --- interferon-? --- antitumor effect --- tannin composition --- oenothein B --- zanamivir --- 2-O-?-laminaribiosyl-4-hydroxyacetophenone --- anticancer activity --- proanthocyanidin --- vegetable tanning --- Dittrichia viscosa --- differentiation --- aurone --- antioxidants --- protein precipitation --- apoptosis --- polyphenolic FASN inhibitors --- forage legume --- biological activities --- ultrahigh-resolution negative mode MALDI-TOF mass spectrometry --- overlay method --- spectroscopy --- wattle tannin --- immune checkpoint --- hormesis --- 3-O-glucosyldelphinidin --- gallotannin --- proanthocyanidins --- fatty acids --- flavonol --- inhibition --- structure --- Candida spp. --- Malassezia spp. --- ORAC assay --- neuroprotection --- crystal structure --- tannins