Use of cyclodextrins to recover catechin and epicatechin from red grape pomace

• Published in: Food chemistry Vol. 203; pp. 379 - 385
• Main Authors: López-Miranda, Santiago, Serrano-Martínez, Ana, Hernández-Sánchez, Pilar, Guardiola, Lucía, Pérez-Sánchez, Horacio, Fortea, Isabel, Gabaldón, José Antonio, Núñez-Delicado, Estrella
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.07.2016
• Subjects: Antioxidants - analysis; Catechin; Catechin - isolation & purification; Chromatography, High Pressure Liquid; Cyclodextrin; Cyclodextrins; Epicatechin; Ethanol; Fruit - chemistry; Grape pomace; Phenols - analysis; Plant Extracts - chemistry; Solutions; Ultrasonics; Vitis; Water; Catechin; Cyclodextrin; Grape pomace; Epicatechin
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2016.02.100

•CDs increase phenolic compounds and antioxidant activity of grape pomace extracts.​•CDs permit a selective extraction of catechin and epicatechin from grape pomace.​•Extraction of catechin and epicatechin with CDs is similar to ethanol extractions.•CDs can be an alternative to organic solvents for extraction of phenolic compounds. The capacity of cyclodextrins (CDs) to extract phenolic compounds from grape pomace was evaluated and compared with that of ethanol/water or aqueous extraction. The extraction method (stirring and ultrasound), temperature and time were also studied. Total phenolic compounds (TPC) and antioxidant activity were measured, and HPLC analysis was used to identify the phenolic compounds. The extracts obtained using the ethanol/water mixture presented the highest TPC content and antioxidant activity, followed by those obtained using CD solutions. The addition of CDs to the extractant agent had a selective effect on the extraction of catechin and epicatechin. The yield of catechin and epicatechin by using aqueous solutions of CDs was similar to that obtained using organic solvents as ethanol.