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

Abstract

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.

Combined Effects of Hot Water and Eucalyptus Leaf Extract on the Storability of Cyprus Local Mandarin

“…The HWD treatment alone or in combination with EL in present study was also found to protect fruit SSC, TA, fruit rmness and AsA contents as compared with the control groups. The biosynthesis of AsA was previously suggested to enhance scavenging of reactive oxygen species (ROS) [26]. In some other previous studies, similar to present study, hot water treatment was reported to protect the biosynthesis of AsA [34,35].…”

“…Results of present study are in agreement with the ndings of Queb-Gonzalez et al [23] who reported that the postharvest heat treatments prevent the weight loss at mandarin fruits. Hot water treatment was also recommended by several other studies for different citrus species [24,26]. On the other hand, the combination of HWD with Eucalyptus leaf (EL) was recorded in current study to prevent weight loss.…”

“…Previous studies reported that the use of edible coatings [10][11][12] propolis [13], chitosan [14], plants extract or essential oils [15][16][17][18][19] calcium salts [20,21] provides successful control of postharvest fruit decay and improves the storability of fruits. Apart from this, postharvest heat treatment has also reported to provide effective control of postharvest decay and prevent quality loss in storage rooms [22][23][24][25][26]. Previous studies show that both bio-materials and hot water treatment are effective in improving the postharvest storage quality of fruits, but the combination of these studies is very limited.…”

Combined effect of hot water dipping and Cistus creticus L. leaf extracts on the storage quality of fresh Valencia oranges

“…The efficacy of HWD for reducing RR and weight loss of fruits is a well-known phenomenon, which was suggested by several studies (Yun et al, 2013;Opio et al, 2017;Atrash et al, 2018;Kahramanoğlu et al, 2020a;. In a different study, Wei et al (2018) noted that the efficacy of heat treatment for preserving the storability of strawberry fruits can be increased with the combination of heat treatment with tea tree oil. This report is in accordance with the findings of current work, where the efficacy of HWD was increased by its combination with C. creticus leaf extract.…”

Biochemical Composition of Propolis and Its Efficacy in Maintaining Postharvest Storability of Fresh Fruits and Vegetables

“…At this point, development of alternative human/ecofriendly measures to agrochemicals has been an important subject for the scientific world [13]. In this context, numerous studies have been conducted to develop human/ecofriendly alternatives and suggested many biomaterials or measures for the prevention of the postharvest losses: hot water dipping (HWD) [14], hot air treatment (HAT) [15], salts [16], light irradiation [17], modified atmosphere packaging (MAP) [18], edible coatings [19,20], plant extracts [21][22][23][24], essential oils [25,26], chitosan [27,28], and propolis [29,30]. Among these, propolis has an important role in prevention of food loss and waste, thus helping to ensure food safety and security.…”