Solar Drying: Fundamentals,Applications and Innovations - National ...

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Hii and Ong - Quality Characteristics of Solar Dried Products Plums Greenhouse dryer - Both solar and open sun drying of plums pre-treated by combination of 1% potassium hydroxide and 60°C dipping temperature or by combination of 1% sodium hydroxide and 60°C dipping temperature resulted in relatively higher values of redness and yellowness as compared to artificial drying. - The combined effect of solar radiation and these pre-treatment combinations reduced the darkish colour of plums during solar drying and open sun drying. Tarhan (2007) Indian gooseberry Forced convective solar dryer - Flaking treated sample retained maximum ascorbic acid (76.6%). - The greater retention of ascorbic acid in flaking treated sample might be due to reduced exposure of the sample in the drying air. - Loss of taste and flavour were found lower in flaking and pricking treatments. Verma and Gupta (2004) Papaya latex Rock bed indirect solar dryer - Solar dried latex had a slightly higher preteolytic activity than the fresh sample because of the effect of ultraviolet radiation on the histidine residue which is essential for proteolytic activity. - This was attributed to the use of the indirect dryer since the latex was not exposed to any direct radiation. Narinesingh and Mohammed-Maraj (1989) Table 5.5. Solar dried grains/seeds/beans Product type Cocoa beans Type of solar dryer Direct solar dryer Major findings - Overall quality evaluation (flavour, acidity, fermentation index, appearance and odour) indicated that loading of 20 kg cocoa beans is recommended. - At this quantity, duration of drying was shorter and this reduces the risk of putrefactive development in the beans due to unfavourable weather condition. References Hii et al. (2006) Cocoa beans Indirect and direct type - Dried sample from indirect dryer showed the highest cut test score while the direct dryer showed the lowest. Bonaparte et al. (1998) 116 Drying of Foods, Vegetables and Fruits
Hii and Ong - Quality Characteristics of Solar Dried Products solar dryers - The dried beans from the direct dryer were more brittle and higher in acidity than the open air and indirect dryers. - Dried beans from the indirect dryer showed the highest quality in overall. Coffee Coffee Solar tunnel dryer Solar dryer with black transpired air solar collector - Visual and organoleptical tests showed no significant difference between the solar dried and sun dried coffee beans. - This could be due to the rather similar drying rates between solar and sun drying. - Coffee beans dried faster in the solar dryer but still produced an acceptable cup with no serious defects. - No OTA forming fungi was found in solar dried samples. Amir et al. (1991) Chapman et al. (2006) Rice Mixed mode passive solar dryer - Solar dried rice resulted in higher degree of whiteness than sun dried rice. - Samples dried in solar dryer are similar in flavour than those dried under the sun. Mehdizadeh and Zomorodian (2009) Corn Drying bin installed will bin-wall solar collector - The quality of solar dried corn was superior to that dried using one-pass high-temperature treatment. - The improvement was in physical characteristics of the kernels i.e. stress cracking, bulk density and breakage susceptibility. Otten and brown (1982) Pistachio nuts Direct solar dryer - Both solar and sun dried samples showed excellent taste as compared to hot air dried samples. - No aflatoxin was found in both sun and solar dried pistachio nuts. Ghazanfari et al. (2003) Table 5.6. Solar dried medicinal plant, herb and spice products Product type Thyme Type of solar dryer Solar dryer using wire basket Major findings - The essential oils extracted from the oven dried and solar dried samples were 0.5% and 0.6% (per 100 g dry wt), respectively. - The oleoresin and ash content were 27% for both drying methods and 1.6%, 2.03% and 2.25% for the fresh, oven dried and solar dried samples, re- References Balladin and Headley (1999) Drying of Foods, Vegetables and Fruits 117
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Solar Drying:Fundamentals,Applicati
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Solar Drying: Fundamentals, Applica
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PREFACE Drying using solar radiatio
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Index Chapter No Title / Authors Pa
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Visavale - Principles, Classificati
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Table 1.4. Quality and other drying
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It was seen that for all fish, hot
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