Abstract

NARVAEZ-CUENCA, Carlos Eduardo; MATEUS-GOMEZ, Ángela  and  RESTREPO-SANCHEZ, Luz Patricia. Antioxidant capacity and total phenolic content of air-dried cape gooseberry (Physalis peruviana L.) at different ripeness stages. Agron. colomb. [online]. 2014, vol.32, n.2, pp.232-237. ISSN 0120-9965.  https://doi.org/10.15446/agron.colomb.v32n2.43731.

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 b-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 GA E/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 mmol trolox/g fruit DW) were comparable to those obtained with FRAP (ranging from 82.9±16.3 to 153.9±31.7 mmol trolox/g fruit DW). The values assessed with DPPH ranged from 21.0±3.2 to 34.1±5.1 mmol trolox/g fruit DW. The b-carotene-linoleate assay gave values ranging from 5.8±1.1 to 12.7±2.0 mmol a-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 b-carotene-linoleate assays resulted in lower values in the air-dried fruit.

Keywords : tropical fruit; functional food; polyphenols.

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