African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6688

Full Length Research Paper

Effect of ultraviolet-C (UV-C) illumination on postharvest quality and bioactive compounds in yellow bell pepper fruit (Capsicum annuum L.) during storage

Surassawadee Promyou1,2 and Suriyan Supapvanich1,2*
  1Faculty of Natural Resources and Agro-Industry, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon, 47000, Thailand. 2Postharvest Technology Innovation Center, Commission on Higher Education, Bangkok 10400, Thailand.
Email: [email protected]

  •  Accepted: 05 June 2012
  •  Published: 28 July 2012

Abstract

 

The effects of ultraviolet-C (UV-C) illumination on postharvest quality and bioactive compounds of yellow bell pepper during refrigerated storage were investigated. The yellow bell pepper fruit were illuminated with three different UV-C dosages, 2.2, 4.4 and 6.6 kJ m-2 and then stored at 12 ± 1°C for 15 days. UV-C illumination at 6.6 kJ m-2 showed the best results in maintaining firmness and reducing the increase in weight loss and electrolyte leakage (EL) throughout storage. No significant differences in both weight loss and firmness were detected in the fruit illuminated with UV-C at 2.2, 4.4 kJ m-2 and the control fruit over storage. UV-C illumination had no effect on the changes in tristimulus colours (lightness, L* value, and yellowness, b* value), ascorbic acid (AsA) and total phenol (TP) contents of the yellow pepper fruit and these remained constant over storage. UV-C illumination at 6.6 kJ m-2 enhanced total carotenoid (TC), total flavonoid (TF) contents, antioxidant capacity and the activities of antioxidant enzymes including catalase (CAT), superoxide dismutase (SOD), guaiacol peroxidase (G-POD) and ascorbate peroxidase (AsA-POD) when compared to the control fruit. In conclusion, UV-C illumination prevented the loss of firmness, weight and EL increase and enhanced biologically active compounds, especially, antioxidants, in yellow bell pepper fruit.

 

Key words: Yellow bell pepper fruit, UV-C illumination, postharvest quality, bioactive compounds.