Physicochemical quality of twin layer solar tunnel dried tomato slices
The objective of this experimental study was to evaluate the effect of twin layer solar tunnel drying on physicochemical quality of tomato slices. The novelty of this dryer is that it has two layers of trays unlike Hohenheim solar tunnel dryer which makes it to have drying capacity of more than two...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-05-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844021012305 |
| _version_ | 1818438279375093760 |
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| author | Lelise Tilahun Dufera Werner Hofacker Albert Esper Oliver Hensel |
| author_facet | Lelise Tilahun Dufera Werner Hofacker Albert Esper Oliver Hensel |
| author_sort | Lelise Tilahun Dufera |
| collection | DOAJ |
| description | The objective of this experimental study was to evaluate the effect of twin layer solar tunnel drying on physicochemical quality of tomato slices. The novelty of this dryer is that it has two layers of trays unlike Hohenheim solar tunnel dryer which makes it to have drying capacity of more than two times compare to type hohenheim solar tunnel dryer with equal collector area. The experiment consists of two (tray position and drying position) factors with two levels of tray position (upper tray (samples exposed to direct solar radiation) and lower tray (samples are exposed to only heated air)) and three levels of drying position (collector out let,middle of the dryer and dryer out let) with three replications. During the experiment 180 kg of Tomato slices of Galilea variety with 5mm thickness were dried in the twin layer solar tunnel dryer. Data on physicochemical quality of tomato were collected and analyzed using SAS (version 9.2). software. From the experimental result; an increase in lycopene and phenolic content retention along the length of the dryer was observed while Vitamin C retention showed a decreasing trend. Large retention of total phenol, lycopene and beta carotene content were observed for the lower tray dried tomato slices compared to the upper tray dried ones. The water activity and PH values of the solar tunnel dried tomatoes were within the safe range from microbial growth, enzymatic and non-enzymatic browning. Compared to sun drying; solar tunnel dried tomatoes showed a much better nutrient retention for all quality parameters which is comparable with the data reported for energy intensive mechanical dryers. |
| first_indexed | 2024-12-14T17:38:02Z |
| format | Article |
| id | doaj.art-87da84ff263f4682977a0136adbe3730 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-12-14T17:38:02Z |
| publishDate | 2021-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-87da84ff263f4682977a0136adbe37302022-12-21T22:52:55ZengElsevierHeliyon2405-84402021-05-0175e07127Physicochemical quality of twin layer solar tunnel dried tomato slicesLelise Tilahun Dufera0Werner Hofacker1Albert Esper2Oliver Hensel3Department of Post-Harvest Management, Jimma University, P.O.Box 307, Jimma, Ethiopia; Corresponding author.Institute of Applied Thermo and Fluid Dynamics, Konstanz University of Applied Sciences, D-78462 Konstanz, GermanyINNOTECH mbh, Stuttgart, GermanyDepartment of Agricultural Engineering, University of Kassel, Witzenhausen, GermanyThe objective of this experimental study was to evaluate the effect of twin layer solar tunnel drying on physicochemical quality of tomato slices. The novelty of this dryer is that it has two layers of trays unlike Hohenheim solar tunnel dryer which makes it to have drying capacity of more than two times compare to type hohenheim solar tunnel dryer with equal collector area. The experiment consists of two (tray position and drying position) factors with two levels of tray position (upper tray (samples exposed to direct solar radiation) and lower tray (samples are exposed to only heated air)) and three levels of drying position (collector out let,middle of the dryer and dryer out let) with three replications. During the experiment 180 kg of Tomato slices of Galilea variety with 5mm thickness were dried in the twin layer solar tunnel dryer. Data on physicochemical quality of tomato were collected and analyzed using SAS (version 9.2). software. From the experimental result; an increase in lycopene and phenolic content retention along the length of the dryer was observed while Vitamin C retention showed a decreasing trend. Large retention of total phenol, lycopene and beta carotene content were observed for the lower tray dried tomato slices compared to the upper tray dried ones. The water activity and PH values of the solar tunnel dried tomatoes were within the safe range from microbial growth, enzymatic and non-enzymatic browning. Compared to sun drying; solar tunnel dried tomatoes showed a much better nutrient retention for all quality parameters which is comparable with the data reported for energy intensive mechanical dryers.http://www.sciencedirect.com/science/article/pii/S2405844021012305TomatoSolar dryingSolar tunnel dryerQuality of tomato |
| spellingShingle | Lelise Tilahun Dufera Werner Hofacker Albert Esper Oliver Hensel Physicochemical quality of twin layer solar tunnel dried tomato slices Heliyon Tomato Solar drying Solar tunnel dryer Quality of tomato |
| title | Physicochemical quality of twin layer solar tunnel dried tomato slices |
| title_full | Physicochemical quality of twin layer solar tunnel dried tomato slices |
| title_fullStr | Physicochemical quality of twin layer solar tunnel dried tomato slices |
| title_full_unstemmed | Physicochemical quality of twin layer solar tunnel dried tomato slices |
| title_short | Physicochemical quality of twin layer solar tunnel dried tomato slices |
| title_sort | physicochemical quality of twin layer solar tunnel dried tomato slices |
| topic | Tomato Solar drying Solar tunnel dryer Quality of tomato |
| url | http://www.sciencedirect.com/science/article/pii/S2405844021012305 |
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