Influence of storage environment, maturity stage and pre-storage disinfection treatments on tomato fruit quality during winter in KwaZulu-Natal, South Africa

Tolesa, Getachew Neme; Workneh, Tilahun Seyoum

doi:10.1007/s13197-017-2766-6

Cited by 23 publications

(40 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The significant differences in temperature in relation to the position of sensors in the storage chamber could influence the quality of FV stored inside the IAC þ EC storage chamber. The results observed in this study are in conformity with [29] who indicated that the temperature variations between sensors at the entry and exit of the storage chamber was about 2 C. Determining the ventilation rate to maintain a uniform air distribution in the storage chamber is important as it ensures that an optimal storage environment exists to maintain the physiological condition of fresh produce [30]. The average temperature distribution inside the storage chamber varied from 16.2 C to 16.9 C implying that the IAC þ EC provided optimum temperature condition for the storage of most of the tropical and sub-tropical FV.…”

Section: Variation Of Temperaturesupporting

confidence: 91%

“…The highest RH of 93.8% occurred near the inlet to the storage chamber while the lowest value was at the exhaust end (89.6%). The results observed in this study show similar trends with [29] who indicated that the RH variations between sensors at the entry and exit of the storage chamber were about 12% C. The RH value of 93.8% was the maximum possible level of saturation of air by humidification for IAC þ EC system as 100% RH is not achievable in a direct EC experiment [32]. To achieve 100% will require a cooling pad with a 100% efficiency and the contact time between air and water should be long enough to allow for 100% heat and mass transfer, which in reality does not happen [33].…”

Section: Variation Of Relative Humiditysupporting

confidence: 89%

“…The temperature decreased due to increasing incident solar radiation from morning until afternoon (14h00) and then decreased from then onwards towards evening and sunset as also confirmed by [31]. The IAC þ EC system maintained an average temperature between 16 C and 21 C during the hottest time of the day (11h00 am to 14h00) where ambient temperatures ranged from 29 C to 32 C. The midday period is the critical time in which cooling of fresh produce is important to maintain quality [29]. This implies that the IAC þ EC in particular is highly suitable for fresh produce pre-cooling and for short-term storage in hot and sub-humid to humid areas.…”

Section: Variation Of Temperaturementioning

confidence: 61%

See 2 more Smart Citations

Performance evaluation of an indirect air cooling system combined with evaporative cooling

Sibanda

Workneh

2020

Heliyon

View full text Add to dashboard Cite

This study developed an indirect air-cooling combined with evaporative cooling (IAC þ EC) system for temporary storage of fruit and vegetables (FV) to improve the shelf life of fresh produce under hot and humid climatic conditions. The aim of the study was to investigate the effect of IAC þ EC in providing optimum storage environment of temperature and relative humidity (RH) for the tomato fruit compared to storage under ambient conditions. The IAC þ EC system had a 53-m 3 storage chamber able to store 3.8 tons of tomatoes. Solar energy during the day and a battery bank facility at night powered the cooling system. The structure was constructed and assembled at Ukulinga research center in Pietermaritzburg. The performance of the IAC þ EC was evaluated based on the temperature and the RH measured hourly from 05h00-22h00 daily during a period of 28 days. Temperature and RH were measured in the psychometric unit, various positions in the storage chamber and at ambient conditions. There were significant variations (P < 0.001) in temperature and RH between storage and ambient conditions. The temperature inside the storage chamber was on average 7 C-16 C lower while the average RH was 13%-41% higher than ambient conditions. Temperature and RH at the exhaust end of the IAC þ EC storage chamber were 16.40 C and 88.9% compared to 30.9 C and 47.6% under ambient conditions. Such conditions can enhance the shelf life of FV of moderate respiration rates. Inside the storage chamber, temperature was 15.7 C-16.4 C while the RH was 89.6%-93.8% depending on location. The cooler efficiency varied from 88.04% to 95.6%. The IAC þ EC system performed at the same level as evaporative cooling under dry and arid conditions. The results in this study are evidence that IAC þ EC system can provide optimum storage conditions for FV as well as being a low-cost technology utilizable in hot and sub-humid to humid areas in sub-Saharan Africa.

show abstract

Section: Variation Of Temperaturesupporting

confidence: 91%

Section: Variation Of Relative Humiditysupporting

confidence: 89%

Section: Variation Of Temperaturementioning

confidence: 61%

See 1 more Smart Citation

Performance evaluation of an indirect air cooling system combined with evaporative cooling

Sibanda

Workneh

2020

Heliyon

View full text Add to dashboard Cite

show abstract

“…This study then considers adoption of an indirect air-cooling system combined with evaporative cooling (IAC+EC) which can work both in hot and dry climates and hot and humid areas through incorporation of an indirect heat exchanger (IHE). Tolesa and Workneh (2017) investigated the effect of IAC+EC on the quality of stored tomato fruit over a 30day period compared to ambient conditions. The tomatoes stored under IAC+EC showed higher firmness and hue angle, maintained lower concentration of sugars, had lower physiological weight loss and improved shelflife and marketability as compared to ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Determination of solar energy requirements for indirect cooling combined with evaporative cooling for storage of fresh produce

Sibanda¹,

Workneh²

2020

Afr. J. Agric. Res.

View full text Add to dashboard Cite

A solar photovoltaic (SPV) system generating power to run a 53-m 3 storage for indirect air-cooling combined with evaporating cooling (IAC+EC) for providing a cool environment for storage of tomatoes under small-scale farming was evaluated. The experiment consisted of nine 330 W solar modules, twelve 230 AH Gel batteries, 145 VDC solar charge controller, 5 kW inverter, 290 W ventilation fan, 260 W water pump, psychrometric unit, and a 3.8-ton tomato storage chamber constructed and assembled on site. The psychrometric unit consisted of three-cooling pad layers and a 1760 W indirect heat exchanger. The solar modules were arranged in three series-three strings and were used in conjunction with a three string-48V bank facility. The performance evaluation of the system was conducted with full recirculation of air inside the storage chamber using solar module yield and efficiencies of inverter, battery and charge controller. Based on the experiment data the SPV system produced 2873.5 W that is 98% of the design power output at 80% probability of exceedance. The power yield of 2873.5 W was 24% higher than the power required in running the electrical appliances for IAC+EC system. Tracking the SPV system under ambient conditions with an average daily generation during the period of the experiment, the electrical power efficiency was 14.9%. The power output of modules increased with temperature of the module to 24°C and declined thereafter. The power generated by the SPV system depended on the solar irradiance availability, ambient temperature at the site and the time of the day. It was found that the SPV system could power the IAC+EC during daytime for the summer season, and the excess power stored in the battery could run the system until 22.00 h at night when temperatures were low enough for storage of tomatoes and SPV system was then switched off.

show abstract

“…Temperature is an important environmental factor which is known to decrease and or increase processes occurring in a produce depending on the temperature it is exposed to. Hence, Tolesa and Workneh (2017) suggested that the correct way of preventing postharvest losses caused by the use of inappropriate temperatures from affecting tomatoes chemical properties is exposing the produce to its optimum cooling temperature requirements during postharvest. According to Munoz et al.…”

Section: Introductionmentioning

confidence: 99%

Postharvest quality and bioactive properties of tomatoes (Solanum lycopersicum) stored in a low-cost and energy-free evaporative cooling system

Nkolisa

Magwaza

Workneh

et al. 2019

Heliyon

View full text Add to dashboard Cite

The aim of this study was to investigate the effect of low cost evaporative cooling system on the quality of two tomato cultivars, namely, 9065 jam and round tomatoes. Both the tomato cultivars were harvested from a smallholder farmer's field at Umsinga and stored for 20 days in one of the three storage conditions namely; cold room (CR), room temperature (RT) and evaporative cooling system (ECS) and sampling done every 5 days. The tomato samples were laid out as a factorial design with four replications. Results obtained proved that the storage conditions and storage period had a significant effect ( p < 0.05) on the lycopene content (LC), antioxidants, total phenolic content (TPC) and ascorbic acid (AA) of the tomato samples. A decreasing trend with storage time was observed for antioxidants and TPC for both the cultivars whilst there was an increasing trend of AA and lycopene content on both the cultivars stored in the different storage conditions. Ascorbic acid was highest in samples stored in RT (0.173 mg/100g for round tomatoes; 0.172 mg/100g for 9065 jam tomatoes), second highest in samples stored under ECS (0.16 mg/100g for round; 0.17 mg/100g for 9065 jam) and lowest in samples inside the CR (0.11 mg/100g; 0.12 mg/100g for 9065 jam). Lycopene content was highest in samples stored in RT (45.31 mg/100g for round tomatoes; 52.9 mg/100g for 9065 jam tomatoes) second highest in samples stored under ECS (32.46 mg/100g for round tomatoes; 42.98 mg/100g for 9065 jam tomatoes) and lowest in samples inside the CR (14.16 mg/100g for round tomatoes; 8.79 mg/100g for 9065 jam tomatoes). Total phenolic content was highest in samples stored in CR (0.17 mg/100g GAE for round tomatoes; 0.19 mg/100g GAE for 9065 jam tomatoes) second highest in samples stored under ECS (0.124 mg/100g GAE for round tomatoes; 0.126 mg/100g GAE for 9065 jam tomatoes) and lowest in samples inside the RT (0.11 mg/100g GAE for round tomatoes; 0.12 mg/100g GAE for 9065 jam tomatoes). Antioxidant activities were highest in samples stored in CR (2.05 mg/100g for round tomatoes; 2.03 mg/100g for 9065 jam tomatoes), followed by samples stored under ECS (1.82 mg/100g for round tomatoes; 1.96 mg/100g for 9065 jam tomatoes) and lowest in samples inside the RT (1.02 mg/100g for round tomatoes; 1.07 mg/100 g for 9065 jam tomatoes). The correlation relationship among cultivars was positive and PCA proved that the cultivars were similar. Although CR provided the best storage condition for the investigated parameters, the results provided sufficient evidence that ECS can be the best method to increase shelf life in rural communities due to its association with cost reduction.

show abstract

Influence of storage environment, maturity stage and pre-storage disinfection treatments on tomato fruit quality during winter in KwaZulu-Natal, South Africa

Cited by 23 publications

References 23 publications

Performance evaluation of an indirect air cooling system combined with evaporative cooling

Performance evaluation of an indirect air cooling system combined with evaporative cooling

Determination of solar energy requirements for indirect cooling combined with evaporative cooling for storage of fresh produce

Postharvest quality and bioactive properties of tomatoes (Solanum lycopersicum) stored in a low-cost and energy-free evaporative cooling system

Contact Info

Product

Resources

About