National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present work was aimed to study the rehydration characteristics of dehydrated different onion slices namely, Arka kalyan, Bijapur white and Arka pragati which were dried under open yard sun drying, solar tunnel drying and dehumidified air drying methods. The onions were pre-treated with 10% sodium chloride (NaCl) for 1h, 0.2% potassium metabisulphite (KMS) for 15 minutes and both 10% sodium chloride (NaCl) + 0.2% potassium metabisulphite (KMS) for 15 minutes at room temperature before drying. Rehydration experiments was conducted with three different temperatures (25, 45 and 65 °C), It was revealed from the results that, the dehumidified air dried, untreated Bijapur white onion had higher rehydration ratio of 5.08 followed by dehumidified air dried, untreated Arka pragati and Arka kalyan onion was 5.07 and 5.06 at 65 °C as compared other two temperatures. The pretreatment resulted in a decrease in the diffusion coefficient of water as well as an increase in the diffusion coefficient of solute during rehydration. Decrease in the diffusion coefficient of water was due to an increase in the proportion of ruptured and shrunken cells caused by osmotic treatments, which in turn resulted in reduced ability of dried onion tissue to absorb water. The increase in diffusion coefficient for solid during rehydration was higher in the case of osmotic pre-treated material, some of the solids absorbed during osmotic dehydration were not retained in the cell matrix and dissolve faster than the constitutive onion dry matter.
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