Drying Characteristics and Microbiological Quality Assessment of Solar-Dried Tomato

Owureku-Asare, Mavis; Oduro, Ibok; Saalia, Firibu Kwesi; Tortoe, Charles; Ampah, Jonathan; Ambrose, Kingsly

doi:10.1155/2022/2352327

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…The lower relative humidity recorded in PSSD compared to that of ambient (OSD) air may have facilitated the faster drying rate of sliced tomatoes in the PSSD (Figure 4b). These findings are in agreement with the study by [24] where 14-15% final moisture content was recorded for solardried tomatoes and 19-22% for sun-dried tomatoes over 23-25 h. The moisture contents of tomato in either of the drying vessels were un-regulated in terms of temperature, however, the temperature in the PSSD was more than the OSD because of the enclosure and the black surface areas of the floor and the drying trays.…”

Section: Moisturesupporting

confidence: 92%

Evaluation of NSPRI Parabolic Shaped Solar Dryer (PSSD) for Drying of Tomatoes Under Semi-arid Climate Zone

Joel,

Alkali,

Ibrahim

et al. 2024

Preprint

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This study evaluated the performance of a Parabolic Shaped Solar Dryer (PSSD) developed at Nigerian Stored Products Research Institute Kano (NSPRI) and compared it with an Open Sun Drying (OSD) - Ambient. The evaluation was carried out using Tomatoes (Eka). After sorting and washing the fresh tomatoes were sliced into 15 mm thickness and then spread on trays in PSSD and OSD. A thermo-hygrometer was used to record daily temperature and relative humidity. The dried Tomatoes' average drying temperature and relative humidity were 68.2 oC and 50.5% for PSSD, 47.5 oC, and 66.6% for OSD. The average drying rate was 31.6 kg/day for PSSD and 19.7 kg/day for OSD. The result showed that PSSD recorded the highest temperature variation and drying for drying of Tomatoes when compared to OSD. Initial moisture of 89.12% was reduced to a final moisture content of 14.5% for PSSD and 17.8% for OSD after six days of drying. Physiochemical and functional properties of the dehydrated tomato were also carried out. The bacteria count was lower in PSSD (5.8 x 103 Cfu/ml) compared to OSD (7.6 x 103 Cfu/ml). However, no fungal growth was observed in OSD where 4.1 x 103 Cfu/ml was recorded in PSSD.

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Section: Moisturesupporting

confidence: 92%

Evaluation of NSPRI Parabolic Shaped Solar Dryer (PSSD) for Drying of Tomatoes Under Semi-arid Climate Zone

Joel,

Alkali,

Ibrahim

et al. 2024

Preprint

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“…( 2013 ) for drying tomato slices and Owureku‐Asare et al. ( 2022 ) during the quality assessment of solar‐dried tomato slices. It was reported that dried products increased in water contents during the following drying days, which was caused by the absorption of water from high‐humidity air.…”

Section: Resultsmentioning

confidence: 99%

Techno‐economic analysis of a solar‐assisted heat pump dryer for drying agricultural products

Rulazi,

Marwa,

Kichonge

et al. 2023

Food Science & Nutrition

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Postharvest losses (PHLs) of biomaterials, such as vegetables and fruits, significantly impact food security and economic stability in developing nations. In Tanzania, PHLs are estimated to range between 30% and 40% for cereal crops and even higher for perishable crops such as fruits and vegetables. Open‐sun drying (OSD) is the most extensively employed method because of its affordability and simplicity. However, OSD has several drawbacks, including difficulties in managing drying parameters, long drying times owing to adverse weather, and product contamination. The solar‐assisted heat pump dryer (SAHPD) is a technology designed as an alternative solution for drying biomaterials and reducing PHL. A limited number of SAHPDs have been constructed in developing nations. Most of the works have concentrated on the performance analysis of the systems. This neglects the techno‐economic assessment, which is important to provide both a quantitative and qualitative understanding of the financial viability of the technology. The present study therefore investigates the techno‐economic analysis of a novel SAHPD for drying agricultural products, particularly vegetables and fruits. To determine whether the SAHPD technology is technically and economically viable, tomatoes and carrots were dried and analyzed to determine their thermal and economic performance. The results show that the initial moisture contents of tomatoes (Lycopersicum esculentum) and carrots (Daucus carota) were reduced from 93% and 88% to 10% in 11 and 12 h, respectively. The coefficient of performance (COP), drying time (DT), specific moisture extraction ration (SMER) and thermal efficiency () were found to be 3.4, 2.3 kg/h, 1.33 kg/kWh and 54.0%, respectively. The economic analysis was assessed using the annualized cost, lifecycle savings, and payback period for the dryer's life span of 15 years. The initial investment of the SAHPD was $5221.8 and the annualized cost was $1076.5. The cumulative present worth for 15 years was found to be $23,828.8 and $27,553.1 for tomatoes and carrots, respectively. The payback period for tomatoes was found to be 3 years, whereas for carrots it was 2.6 years. Based on thermal and economic performance assessment results, the developed SAHPD is technically and economically viable to be considered for further investments.

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“…The work used the Taguchi technique and, it was observed that the drying temperature is the most important to control the drying time. In 2022, further authors evaluated the effectiveness of a mixed-mode natural convection solar dryer for the transformation of fresh Roma variety tomatoes into dried tomato powder [44]. Their results were satisfactory in terms of consumer appreciation.…”

Section: Introductionmentioning

confidence: 99%

Use of a forced convection solar dryer for the reduction of post-harvest losses: case of the ‘akikon’ tomato variety in benin (West Africa)

Vitouley,

Hounsokou,

Kouchadé

et al. 2024

Environ. Res. Commun.

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The local variety tomato (Lycopercicum esculentum Mill) named "akikon" is one of the most consumed and widely cultivated fruiting vegetables in Benin Republic. In this work, we designed and built a dryer usable for limiting the frequent losses of the produced tomatoes. This paper analyzes the first results, obtained from the different experiments carried out with the developed dryer, in a context of forced convection. The results showed that increasing the temperature resulted in a shorter drying time and a brighter colour of the dried tomato. However, the temperature has no influence on the smell of the dried tomato. After a storage time of about 7-8 months, a colour of the dried product has changed from red to red-brown, indicating that the storage method still needs to be improved.

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Drying Characteristics and Microbiological Quality Assessment of Solar-Dried Tomato

Cited by 4 publications

References 45 publications

Evaluation of NSPRI Parabolic Shaped Solar Dryer (PSSD) for Drying of Tomatoes Under Semi-arid Climate Zone

Evaluation of NSPRI Parabolic Shaped Solar Dryer (PSSD) for Drying of Tomatoes Under Semi-arid Climate Zone

Techno‐economic analysis of a solar‐assisted heat pump dryer for drying agricultural products

Use of a forced convection solar dryer for the reduction of post-harvest losses: case of the ‘akikon’ tomato variety in benin (West Africa)

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