Proximate composition, mineral analysis and physicochemical properties of dragon fruit (Hylocereus Undatus)’s flower

Ong, Meng Ooi (2007) Proximate composition, mineral analysis and physicochemical properties of dragon fruit (Hylocereus Undatus)’s flower. Universiti Malaysia Sabah. (Unpublished)

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Abstract

This study was to determine proximate composition, mineral content and physicochemical properties of dragon fruit (Hylocereus undatus)'s flower using different treatment and storage temperature. Different treatments were store before blending (A) or blend before storing (B) and storage temperatures (25°C and -40C) were used. Treament A with 25°C label as A25, treament A with -4°C label as A-4, treament B with 25°C label as B25, and treament B with -4°C label as B-4. The comparison of four samples using different treatments and storage temperatures showed that there were no significant differences in proximate composition, mineral content and physicochemical properties. In mineral analysis, potassium content in dragon fruit (Hylocereus undatus)'s flower was found to be high. Most mineral elements (i.e., sodium, calcium, magnesium, iron, copper and zinc) were found in small amount in this species. Sample A25 contained 78.02mg/g potassium, 7.26mg/g sodium, 19.72mg/g calcium, 11.87mg/g magnesium 0.2091mg/g iron, 0.0153mg/g copper and 0.1404mg/g zinc. Sample A-4 contained 52.44mg/g potassium, 5.40mg/g sodium, 7.56mg/g calcium, 8.27mg/g magnesium 0.1102mg/g iron, 0.0050mg/g copper and 0.0536mg/g zinc. Sample B25 contained 73.03mg/g potassium, 6.67mg/g sodium, 18.40mg/g calcium, 10.21mg/g magnesium 0.2042mg/g iron, 00.0101mg/g copper and 0.1134mg/g zinc. Sample B-4 contained 41.70mg/g potassium, 5.50mg/g sodium, 5.33mg/g calcium, 5.47mg/g magnesium 0.0843mg/g iron, 0.0021mg/g copper and 0.0392mg/g zinc. For the four treated samples, the range for water content was 90-92%. The values of crude fiber were within 6-7%. Ash, protein and crude fat showed the all values below 1%. And the values of carbohydrate were above 2% and below 1% for sample stored at room temperature and freeze temperature respectively. For physicochemical properties, soluble solid content of samples stored at 25°C and samples stored at -4°C were 6°Brix and 5°Brix respectively on the 7th day. The pH value for the four samples was fluctuating within pH value 4.4 and 5. The results of acidity showed the value between 0.13 and 0.25. In conclusion, dragon fruit (Hy/ocereus undatus)'s flower contained high water content in proximate composition and high content of potassium in mineral analysis.library123

Item Type: Academic Exercise
Uncontrolled Keywords: dragon fruit, storage temperature, treatment, potassium, high water content
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: 16 Aug 2013 02:21
Last Modified: 23 Oct 2017 07:29
URI: http://eprints.ums.edu.my/id/eprint/6728

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