Dehydrated pitaya (Hylocereus undatus) fruit cubes containing immobilized Lactobacillus acidophilus La-5 cells

Wong, Soo Yuen (2006) Dehydrated pitaya (Hylocereus undatus) fruit cubes containing immobilized Lactobacillus acidophilus La-5 cells. Universiti Malaysia Sabah. (Unpublished)

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Abstract

In this study, an attempt is made to combine the beneficial effects of Lactobacillus acidophil us La-5 with pitaya fruit (Hylocereus undatus) by applying the immobilization process. Pitaya fruit juice containing probiotic cells used as the immobilization medium. The viability of probiotic strains of Lactobacilluas acidophilus La-5 during dehydration process and cold storage of the fruit cubes were studies. In order to increase stability and to assure fruit preservation, immobilized dragon fruit cubes were dehydrated using oven dying at two different temperatures (45ºC and 50ºC), freeze drying and sun drying. The freeze drying method resulted that the highest viability of probiotic cells on fruit cubes than other dehydration methods which decreased the cell population of 0.11109 cfu/g. The oven drying at temperature of 50ºC reduced the population of L acidophilus La-5 by four logarithmic cycles. However, oven drying at temperature of 45ºC and sun drying reduced the probiotic cell viability less than one logarithmic cycle. The physical properties such as rehdration ratio and texture were carried out on the dragon fruit cubes. Sample of dried dragon fruit cubes were stored at 40ºC up to 15 Days. During the storage condition, the cell numbers of probiotic on fruit cubes decreased less than one logarithmic cycle for all the dehydration methods which the viable cell content of final products was around 105 to 106 cfu/g and considered the proposed process as adequate to develop dehydrated products containing probiotic cells.

Item Type: Academic Exercise
Uncontrolled Keywords: Hylocereus undatus, Lactobacillus acidophilus La-5, immobilization, hydration, temperature
Subjects: T Technology > TX Home economics > Nutrition. Foods and food supply
Divisions: SCHOOL > School of Food Science and Nutrition
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 29 Jul 2013 06:31
Last Modified: 23 Oct 2017 07:18
URI: http://eprints.ums.edu.my/id/eprint/6637

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