Effect of air-drying temperature on physico-chemical properties, antioxidant capacity, colour and total phenolic content of red pepper (Capsicum annuum, L. var. Hungarian)

Antonio Vega-Gálvez, Karina Di Scala, Katia Rodríguez, Roberto Lemus-Mondaca, Margarita Miranda, Jessica López, Mario Perez-Won

Research output: Contribution to journalArticlepeer-review

329 Scopus citations

Abstract

Red pepper has been recognised as an excellent source of antioxidants, being rich in ascorbic acid and other phytochemicals. Drying conditions, particularly temperature, leads to pepper modifications that can cause quality degradation. In this work, the effects of process temperatures between 50 and 90 °C on physico-chemical properties, rehydration, colour, texture, vitamin C, antioxidant capacity and total phenolics during the drying of red pepper were studied. The rehydration ratio decreased with temperature and the maximum water holding capacity was achieved at 50 °C. Both vitamin C content and the total phenolic content decreased as air-drying temperature decreased. The radical scavenging activity showed higher antioxidant activity at high temperatures (i.e. 80 and 90 °C) rather than at low temperatures (i.e. 50, 60 and 70 °C). Chromatic parameters (L*, a*, b*, C* and H°), non-enzymatic browning compounds and extractable colour were affected by drying temperature, which contributed to the discolouring of pepper during this process.

Original languageEnglish
Pages (from-to)647-653
Number of pages7
JournalFood Chemistry
Volume117
Issue number4
DOIs
StatePublished - 15 Dec 2009
Externally publishedYes

Keywords

  • Air-drying
  • Antioxidant properties
  • Pepper
  • Radical scavenging activity
  • Total phenolic content
  • Vitamin C

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