Journal
POSTHARVEST BIOLOGY AND TECHNOLOGY
Volume 127, Issue -, Pages 99-104Publisher
ELSEVIER
DOI: 10.1016/j.postharvbio.2016.12.010
Keywords
UV radiation; Wounding; Antioxidants; Bioactive compounds; Chlorogenic acid
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The single and combined effects of UV-B (1.5 kJm (2)) and UV-C (4.0 kJm (2)) radiation treatments were studied on the phenylalanine ammonia-lyase (PAL) activity, phenolic content and antioxidant capacity (TAC) of shredded fresh-cut carrots during 72 h at 15 C-degrees. Non-irradiated samples were used as control (CTRL). PAL activity of UV-B and CTRL samples was increased by approximately 760% after 72 h while increases of 120-140% in the remaining radiation treatments were found. Chlorogenic acid represented 70% of the sum of phenolic compounds of initial samples. UV-B treatment showed the highest phenolic accumulation with 498% after 72 h, regarding its initial value, while single and combined UV-C treatments achieved an accumulation of 440%, which was similar to CTRL samples. Such phenolics data were highly correlated (R-2 =0.82) to total antioxidant capacity throughout storage. Conclusively, UV-B treatment achieved the highest phenolic compounds accumulation and related antioxidant capacity in shredded carrot during 3 days at 15 degrees C. Furthermore, the use of UV-C treatment with sanitizing purposes combined with UV-B radiation did not negatively affect the accumulation of bioactive compounds, achieving similar enhancements to CTRL samples.(C) 2017 Elsevier B.V. All rights reserved.
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