Effect of osmotic pre-treatment on the frozen cucumber

Kim, Lian Poh (2010) Effect of osmotic pre-treatment on the frozen cucumber. Universiti Malaysia Sabah. (Unpublished)

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Abstract

Osmotic dehydration is the partial dehydration of food by immersion in a concentrated solution. Osmotic dehydration as a pre-treatment to freezing can improve the quality of frozen cucumber significantly. The objective of this study was to evaluate the effect of the osmotic pre-treatment using different concentrations of sucrose solution on the sensory quality of frozen cucumber. In the first part of the study, the samples were subjected to osmotic dehydration in 40, 50 and 60 % (w/w) sucrose solutions at 35°C, for 180 min. Then, the water content and total solids content in the samples were examined after osmotic dehydration. The results showed that the rates of water reduction and solid uptake were high at the beginning of the process, decreasing gradually as the process proceeded and remaining approximately constant at the end of the process. Based on these results, the time-temperature combination of 60 min-35°C was selected for the following study. In the second part of the study, osmotically pre-treated samples, as well as untreated samples, were rapidly frozen in a quick freezer at - 40°C, until the center of the samples reached - 18 0c. After that, colour, texture and sensory characteristics of the frozen samples were studied during storage at - 18°C, for 8 weeks. The results indicated that better green colour retention and improved firmness in osmotically pre-treated samples, compared to the untreated samples. Furthermore, the results of the sensory evaluation were also in agreement to the respective analytical measurement. However, there was no any significant difference between samples osmotically pre-treated with different concentrations of sucrose solution.

Item Type: Academic Exercise
Uncontrolled Keywords: Osmotic pre-treatment, Frozen cucumber
Subjects: ?? TP368-456 ??
Divisions: SCHOOL > School of Food Science and Nutrition
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 10 Nov 2011 07:53
Last Modified: 12 Oct 2017 06:21
URI: http://eprints.ums.edu.my/id/eprint/699

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