Chapter 1. Polyphenols : sources and main characteristics / Hernan Speisky, Jocelyn Fuentes, Eva Dorta, and Camilo Lopez-Alacron -- Chapter 2. Key aspects of polyphenols and health : metabolic fate, mechanisms of action, and influence on gut microbiota / Josep Lluis Torres, Sara Ramos-Romero, and Jara Perez-Jimenez -- Chapter 3. Solid-liquid extraction of polyphenols at low pressure / Eduardo Caballero-Valdez, Araceli Olivares-Miralles, Carmen Soto-Maldonando, and Maria Elvira Zuniga-Hansen -- Chapter 4. Extraction of polyphenols by pressurized liquids / Jose Rodrigo Vergara-Salinas, Jose Cuevas-Valenzuela, and Jose Ricardo Perez-Correa -- Chapter 5. Supercritical fluid extraction of polyphenols / Jose M. del Valle, Edgar Uquiche, and Loreto Valenzuela -- Chapter 6. Analysis and characterization of polyphenol extracts / Sonia Guadalupe Sayago-Ayerdi, Gilberto Mercado-Mercado, Sara Ramos-Romero, Josep Lluis Torres, and Jara Perez-Jimenez -- Chapter 7. Purification of polyphenolic extracts from natural sources : adsorption and membrane technologies / Maria P. Casas and 7 others -- Chapter 8. Fractionation of polyphenols / Peter Winterhalter and Ulrich H. Engelhardt -- Chapter 9. Drying and preservation of polyphenols / Paz Robert, Paula Garcia, and Carolina Fredes -- Chapter 10. Inclusion of polyphenols into food matrices / Veronica Dueik and Pedro Bouchon.