Effect of ozone on qualities of fruits and vegetables in cold storage

2001 ◽  
Vol 81 (4) ◽  
pp. 773-778 ◽  
Author(s):  
L. J. Skog, and C. L. Chu
Keyword(s):  
Key Words ◽  
Fruit Quality ◽  
Cold Storage ◽  
Fruits And Vegetables ◽  
Storage Life ◽  
Detectable Level ◽  
Storage Room ◽  
Potential Use ◽  
Ethylene Level

Ozone at the concentration of 0.04 mL L–1 appears to have potential for extending the storage life of broccoli and seedless cucumbers stored at 3°C. Response to ozone was minimal for mushrooms stored at 4°C and cucumbers stored at 10°C. Ozone generators producing 0.04 mL L–1 ozone reduced the ethylene level in vegetable storage rooms from 1.5–2 mL L–1 (as produced by apples placed in the room) to a non-detectable level. At concentrations of 0.4 mL L–1, ozone was effective in removing ethylene from the atmosphere in an apple and pear storage room. The ozonized and non-ozonized apples and pears showed no difference in fruit quality. This study explored a potential use of ozone application in wholesale storage rooms where ethylene-producing and ethylene-sensitive fruits and vegetables may be stored together. Key words: Ozone, ethylene, fruit, vegetable, apple, pear, broccoli, cucumber, mushroom, storage

scholarly journals Analisis Vegetasi dan Potensi Hutan Bukan Kayu di Kawasan Hutan Kampung Pagai, Distrik Airu, Kabupaten Jayapura, Papua

2018 ◽  
Vol 4 (2) ◽  
pp. 54-62
Author(s):  
Rosye H.R. Tanjung ◽  
Suharno Suharno ◽  
Jhon D. Kalor
Keyword(s):  
Everyday Life ◽  
Key Words ◽  
Tree Species ◽  
Building Materials ◽  
Fruits And Vegetables ◽  
Forest Products ◽  
Local People ◽  
Human Needs ◽  
Non Timber Forest Products ◽  
Potential Use

Forest is a resources system which has prospective materials to be used for human needs. Local people within everyday life are very dependent on the natural surroundings, as well as the use of nature for human needs tend to increase. The purpose of this research is to do the analysis of vegetation and determine the potential use of non-timber forest products in Kampung Pagai, Airu District, Jayapura. The method used for the analysis of vegetation is the square plot, while the method to figure out the potential of non-timber forest adopts the method developed by Waluyo (2004). The results showed that there are at least 39 species of trees belonging to the 26 families. Regeneration of trees showed the condition which is good based on the diversity of tree species in the Sapling level, especially matoa (Pometia pinnata), kayu besi (Instia bijuga), and various plants of Ficus ssp. The potential uses of non-timber forest are also quite high. Several types of plants can be used as building materials and accessories, medicines, ornaments (including orchids), fruits, and vegetables. Key words: forest, vegetation, non-timber forest product, Airu District, Jayapura.

scholarly journals Modelling and simulation of a cold storage room driven by a continuous adsorption refrigerator

2020 ◽  
Vol 330 ◽  
pp. 01024
Author(s):  
Kolthoum Missaoui ◽  
Slimane Gabsi ◽  
Nader Frikha ◽  
Abdelhamid Kheiri ◽  
Mohammed El Ganaoui
Keyword(s):  
Cold Storage ◽  
Fruits And Vegetables ◽  
Adsorption Process ◽  
Coefficient Of Performance ◽  
Cooling Load ◽  
Continuous Adsorption ◽  
Storage Room ◽  
System Components ◽  
Maximum Coefficient ◽  
Process Heat

The present work proposes a continuous solar adsorption refrigerator for a positive cold storage room of 231 m3 used for fruits and vegetables preservation and installed in the south of Tunisia. After the estimation of the storage room cooling load, which is equal to 13 kW, a parametric study, aims to improve, the performance of the chiller is done in order to achieve the storage room need and to estimate the required heat in the refrigerator generator. A theoretical model, based on the thermodynamics of the adsorption process, heat and mass transfer within the porous medium and energy balance in the system components, is developed and a simulation with Matlab/Simulink, is carried out. The model was established and validated with the literature experimental data. A maximum coefficient of performance of 0.52 and cooling load of 22 kW are reached at cycle time of 800 seconds, the inlet temperatures of heating, cooling and chilled water are 85°C, 22°C and 15°C, respectively.

scholarly journals Development and Evaluation of an Ultrasonic Humidifier to Control Humidity in a Cold Storage Room for Postharvest Quality Management of Dates

Foods ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 949
Author(s):  
Maged Mohammed ◽  
Nashi Alqahtani ◽  
Hamadttu El-Shafie
Keyword(s):  
Quality Management ◽  
Cold Storage ◽  
Cooling System ◽  
Positive Impact ◽  
Droplet Diameter ◽  
Postharvest Quality ◽  
Main Element ◽  
Small Scale ◽  
Storage Room ◽  
Ultrasonic Humidifier

Dates are subjected to postharvest losses in quality and quantity caused by water loss, fermentation, insect infestation, and microbial spoilage during storage. Cold storage is the main element in the postharvest quality management used for fruit preservation. Although cold storage is used for dates, precision control of the relative humidity (RH) using ultrasonic applications is not used thus far, or it is applied to other fruits on a small scale. Therefore, we designed and constructed an ultrasonic humidifier (DUH) for RH control in the cold storage room (CSR) of dates. The optimum air velocity of 3 m s−1 at the outlets of the DUH ducts produced a mist amount of 6.8 kg h-1 with an average droplet diameter of 4.26 ± 1.43 µm at the applied voltage of 48 V and frequency of 2600 kHz of the transducers. The experimental validation was carried out by comparing a CSR controlled with the DUH with two conventional CSRs. The three tested CSRs were similar in dimensions, cooling system, and amount of stored dates. The time required for cooling 800 kg of dates in the controlled CSR from 25 °C to the target temperature of 5 °C was approximately 48 h. The DUH precisely controlled the RH at the maximum RH set point of 80% in the tested CSR at 5 °C. The controlled RH at 80% has a positive impact on the physicochemical characteristics of the stored dates. It significantly reduced the weight loss of the fruits and preserved fruit mass, moisture content, water activity, firmness, and color parameters. However, no significant effect was observed on fruit dimensions, sphericity, and aspect ratio. The microbial loads of mesophilic aerobic bacteria, molds, and yeasts fell within the acceptable limits in all tested CSRs. Both stored date fruits and artificially infested dates showed no signs of insect activity in the controlled CSR at the temperature of 5 °C and RH of 80%. The DUH proved to be a promising technology for postharvest quality management for dates during cold storage.

scholarly journals Efficacy of coupling gamma irradiation with calcium chloride and lemongrass oil in maintaining guava fruit quality and inhibiting fungal growth during cold storage

2018 ◽  
Vol 30 (1) ◽  
pp. 67-78 ◽  
Author(s):  
Ramadan A. Hassanein ◽  
Ehab A. Salem ◽  
Ahmed A. Zahran
Keyword(s):  
Vitamin C ◽  
Fruit Quality ◽  
Cold Storage ◽  
Fungal Growth ◽  
Alternaria Solani ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Γ Irradiation ◽  
Lemongrass Oil

AbstractThis study was performed to explore the efficacy of combining more than one postharvest treatment in maintaining some quality attributes and reducing fungal pathogenicity in cold-stored guava fruits. The investigated postharvest treatments included the control, CaCl2(4%), lemongrass oil (2 dm3kg−1), gamma (γ) irradiation (0.2, 0.4 and 0.6 kGy), 0.4 kGy γ irradiation + CaCl2(4%), and 0.4 kGy γ irradiation + lemongrass oil (2 dm3kg−1). The studied physiochemical attributes included weight loss, decay percentage, fruit firmness, total soluble solids (TSS), titratable acidity (TA), and vitamin C content. Different fungal species were also isolated from decayed fruits and were identified asAlternaria alternata,Alternaria solani,Aspergillus niger,Botrytis cinerea,Fusarium solaniandRhizopus stolonifer. The severity of infection for the different fungi was determined, and anin vitroantifungal assay was conducted for lemongrass oil. All the investigated treatments generally reduced decay and water loss percentages, and controlled TSS, TA and vitamin C decrements that occurred during cold storage. On the other hand, higher irradiation doses generally increased fruit softness, and the 0.4 kGy γ dose did not contribute to the overall fruit quality when coupled with CaCl2and lemongrass oil, compared to CaCl2and lemongrass oil treatments alone.

scholarly journals THE STORAGE LIFE OF FRUITS AND VEGETABLES

1979 ◽  
Vol 2 (2) ◽  
pp. 105-112 ◽  
Author(s):  
STUART THORNE ◽  
H. F. Th. MEFFERT
Keyword(s):  
Fruits And Vegetables ◽  
Storage Life

scholarly journals Fruit quality preservation of 'Laetitia' plums under controlled atmosphere storage

2014 ◽  
Vol 86 (1) ◽  
pp. 485-494 ◽  
Author(s):  
CRISTIANO ANDRÉ STEFFENS ◽  
CASSANDRO V.T. DO AMARANTE ◽  
ERLANI O. ALVES ◽  
AURI BRACKMANN
Keyword(s):  
Fruit Quality ◽  
Cold Storage ◽  
Ethylene Production ◽  
Titratable Acidity ◽  
Storage Conditions ◽  
Controlled Atmosphere ◽  
Controlled Atmosphere Storage ◽  
Red Color ◽  
High Incidence ◽  
Atmosphere Storage

The objective of this study was to evaluate the effect of controlled atmosphere (CA) on quality preservation of ‘Laetitia’ plums, mainly on internal breakdown, in order to determine the best CA storage conditions. Two experiments were carried out one in 2010, and another in 2011. In 2010, besides cold storage (CS; 21.0 kPa O2 + 0.03 kPa CO2), the fruits were stored under the following CA conditions (kPa O2+kPa CO2): 1+3, 1+5, 2+5, 2+10, and 11+10. In 2011, the fruits were stored under CS and CA of 1+0, 1+1, 2+1, and 2+2. The fruit stored under different CA conditions had lower respiration and ethylene production, better preservation of flesh firmness, texture and titratable acidity, lower skin red color, and lower incidence of skin cracking than the fruit in CS. In 2010, the fruit under CA with 2+5, 1+5, and 1+3 had a pronounced delay in ripening, although it exhibited a high incidence of internal breakdown. In 2011, the CA conditions with 2+1 and 2+2 provided the best delay in ripening and a reduced incidence of internal breakdown. The best CA condition for cold storage (at 0.5°C) of ‘Laetitia’ plums is 2 kPa O2 + 2 kPa CO2.

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