Antioxidant capacity and total phenolic content of air-dried cape gooseberry (physalis peruviana l.) at different ripeness stages

Because the use of drying at high temperatures might negatively affect the functional properties of fruits, the effect of air-drying at 60°C on the total phenolic content (TPC) and antioxidant capacity (AOC) of cape gooseberry fruit was evaluated at three ripeness stages. The AOC was evaluated with 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), ferric reducing ability of plasma (FRAP), 1,1-diphenyl-2-picrylhydrazyl (DPPH), and β-carotene-linoleate assays. The TPC and AOC increased in the fresh fruit as the ripeness stage increased. The TPC increased from 401.8±19.8 to 569.3±22.3 mg GAE/100 g dry weight (DW). The AOC values obtained with ABTS in the fresh fruit (ranging from 79.4±4.5 to 132.7±12.9 µmol trolox/g fruit DW) were comparable to those obtained with FRAP (ranging from 82.9±16.3 to 153.9±31.7 µmol trolox/g fruit DW). The values assessed with DPPH ranged from 21.0±3.2 to 34.1±5.1 µmol trolox/g fruit DW. The β-carotene-linoleate assay gave values ranging from 5.8±1.1 to 12.7±2.0 µmol α-tocoferol/g fruit DW. Air-drying the cape gooseberry fruit had a small influence on the TPC. The air-dried fruit had AOC values ranging from 27 to 164% of the value of the fresh fruit. While the ABTS assay produced higher values in the air-dried fruit than in the fresh fruit, the FRAP, DPPH, and β-carotene-linoleate assays resulted in lower values in the air-dried fruit.

• Autores: Narváez-Cuenca, Carlos Eduardo; Mateus-Gómez, Ángela; Restrepo-Sánchez, Luz Patricia
• Tipo de recurso: Article of journal
• Fecha de publicación: 2014
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/50184
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/50184; http://bdigital.unal.edu.co/44161/
• Palabra clave: Tropical fruit; functional food; polyphenols.; Postharvest; horticulture
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional