Osmo-dehydration pretreatment for drying of pumpkin slice

Lee, Jau Shya and Lim, L. S. (2011) Osmo-dehydration pretreatment for drying of pumpkin slice. International Food Research Journal, 18 (4). pp. 1223-1230. ISSN 1985-4668


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This study was designed to elucidate the effects of osmotic dehydration of pumpkin slice prior to hot-air drying. Response Surface Methodology (RSM) with Central Composite Design was used to investigate the influence of three variables, namely sucrose concentration (30-60°Brix), immersion temperature (35-65°C) and immersion time (90-120 min). These factors increased the solid gains and decreased the water activity (a w) of the sample; while the temperature and sucrose solution concentration increased the water loss (p<0.05). These changes affected the L* and b* values of the final product (p<0.05). The process temperature also affected the sensorial properties by increasing the sweetness, dryness, hardness and overall acceptance of the dried pumpkin slice (p<0.05). However, increasing temperature caused the deterioration of colour and aroma. Longer immersion time was found to increase shrinkage, sweetness and overall acceptability of the final product. The optimum osmotic dehydration pretreatment was predicted as immersion using 57.8°Brix sucrose solution at 58.3°C for 146.7 minutes.

Item Type: Article
Keyword: Pumpkin, Osmotic dehydration, Respone Surface Methodology, Sensory evaluation
Subjects: T Technology > TP Chemical technology > TP1-1185 Chemical technology > Food processing and manufacture
Department: SCHOOL > School of Food Science and Nutrition
Depositing User: ADMIN ADMIN
Date Deposited: 21 Sep 2012 16:45
Last Modified: 20 Oct 2017 12:48
URI: https://eprints.ums.edu.my/id/eprint/4924

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