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Open AccessArticle

Effects of Hot Air Treatments on Postharvest Storage of Newhall Navel Orange

1
Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables/Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits & Vegetables in Jiangxi Province, College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
2
European University of Lefke, Faculty of Agricultural Sciences and Technologies, Gemikonagi, via Mersin 10, 99780 Northern Cyprus, Turkey
3
Pingxiang University, Pingxiang 337055, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Plants 2020, 9(2), 170; https://doi.org/10.3390/plants9020170
Received: 7 January 2020 / Revised: 15 January 2020 / Accepted: 22 January 2020 / Published: 1 February 2020
(This article belongs to the Special Issue Advances in Citrus Research)
The effects of hot air flow (HAF) treatment on the postharvest storage of ‘Newhall’ navel oranges were investigated in this study. Studies were conducted with two separate sections. First of all, the effects of HAF at 37 °C for 36 h, for 48 h, and for 60 h were tested on fruit decay and weight loss. Thus, the optimal treatment was found as HAF at 37 °C for 48 h based on the fruit decay percentage and weight loss, and further studies were carried out with this treatment. The HAF-treated and control fruits were flowed at 37 °C and 20 °C with relative humidity (RH) of 85–95% for 48 h, respectively. After flowing, fruits of both treatments were individually film-packed, precooled (10–12 °C, 12 h), and stored (6 ± 0.5 °C and 85–90% relative humidity) for 120 days. Regular (0, 15, 30, 45, 60, 90, and 120 days) measurements were carried out for analyzing total soluble solid (TSS) content, titratable acid (TA) content, vitamin C (VC) content, total sugar content, respiration rate, malondialdehyde (MDA) content, and protective enzyme activities. The results indicated that HAF treatment significantly inhibited the MDA content and respiration rate of navel orange fruits after 45 d storage. The superoxide dismutase (SOD) and peroxidase (POD) enzyme activities were enhanced after 60 d storage, while polyphenol oxidase (PPO) enzyme activities were enhanced throughout the storage period. Results suggested that the SOD and POD activities are highly related with respiratory activities and could be enhanced with hot air flow. Meanwhile, HAF treatment maintained high content of TSS, total sugar, TA, and VC. View Full-Text
Keywords: hot air flowing; fruit decay; biochemical changes; malondialdehyde (MDA) content; enzyme activities hot air flowing; fruit decay; biochemical changes; malondialdehyde (MDA) content; enzyme activities
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MDPI and ACS Style

Wan, C.; Kahramanoğlu, İ.; Chen, J.; Gan, Z.; Chen, C. Effects of Hot Air Treatments on Postharvest Storage of Newhall Navel Orange. Plants 2020, 9, 170.

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