foods Review Traditional Applications of Tannin Rich Extracts Supported by Scientific Data: Chemical Composition, Bioavailability and Bioaccessibility Maria Fraga-Corral 1,2 , Paz Otero 1,3 , Lucia Cassani 1,4 , Javier Echave 1 , Paula Garcia-Oliveira 1,2 , Maria Carpena 1 , Franklin Chamorro 1, Catarina Lourenço-Lopes 1, Miguel A. Prieto 1,* and Jesus Simal-Gandara 1,* 1 Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Food Science and Technology, Ourense Campus, University of Vigo, 32004 Ourense, Spain;
[email protected] (M.F.-C.);
[email protected] (P.O.);
[email protected] (L.C.);
[email protected] (J.E.);
[email protected] (P.G.-O.);
[email protected] (M.C.);
[email protected] (F.C.);
[email protected] (C.L.-L.) 2 Centro de Investigação de Montanha (CIMO), Campus de Santa Apolonia, Instituto Politécnico de Bragança, 5300-253 Bragança, Portugal 3 Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Veterinary, University of Santiago of Compostela, 27002 Lugo, Spain 4 Research Group of Food Engineering, Faculty of Engineering, National University of Mar del Plata, Mar del Plata RA7600, Argentina * Correspondence:
[email protected] (M.A.P.);
[email protected] (J.S.-G.) Abstract: Tannins are polyphenolic compounds historically utilized in textile and adhesive industries, Citation: Fraga-Corral, M.; Otero, P.; but also in traditional human and animal medicines or foodstuffs. Since 20th-century, advances in Cassani, L.; Echave, J.; analytical chemistry have allowed disclosure of the chemical nature of these molecules. The chemical Garcia-Oliveira, P.; Carpena, M.; profile of extracts obtained from previously selected species was investigated to try to establish a Chamorro, F.; Lourenço-Lopes, C.; bridge between traditional background and scientific data.