Antioxidant activities, total phonolic contents and vitamin C of selected fresh fruits pulp from Sabah

Chan, Pei Teng (2009) Antioxidant activities, total phonolic contents and vitamin C of selected fresh fruits pulp from Sabah. Universiti Malaysia Sabah. (Unpublished)

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Abstract

Six Sabah fruits namely bambangan, tarap, pomelo, snake fruit, soursop, and dragon fruit were analyzed for antioxidant activities, total phenolic contents, and vitamin C content. The antioxidant activities were evaluated based on the three assays namely 2,2-diphenyl-l-picrylhydrazyl (OPPH) which measure the scavenging effect on free radicals, ferric reducing antioxidant power (FRAP) measured the measured the reducing ability of fruit extracts in acidic medium whereas β-carotene bleaching assay measured the ability of the fruit extracts in preventing the discoloration of β-carotene solution. Folin-Ciocalteu reagent was used to determine total phenolic contents while spectrophotometry method was used to evaluate vitamin C contents in fruits pulp. Pomelo showed good antioxidant activity in OPPH (0.46±0.10 mg/mL) and FRAP assay (5359.93±84.57 μM TE/g). Besides that, pomelo also contained high amount of total phenolic content (3.35±0.49 GAE/g) and vitamin C (2.83±0.59 mg Mig). On the other hand, tarap showed the lowest activity in all assays being tested. Additionally, tarap also contained the lowest vitamin C content and total phenolic content. According to the Regression analysis, antioxidant activities determined by FRAP and DPPH assay showed good positive correlation with total phenolic content (R²=0.97 and R²=0.94 respectively, p<0.05). There was also good correlation between antioxidant activities measured by FRAP and DPPH assay with vitamin C content (R²=0.83 and R²=0.71, p<0.05 respectively). Thus, the correlation indicated that phenolic compounds and vitamin C content was the contributors to the antioxidant activities of fruits pulp. In conclusion, fresh fruits pulp showed high potential to be utilized as source of natural antioxidant.

Item Type: Academic Exercise
Uncontrolled Keywords: Antioxidant activities, Bambangan, Tarap, Pomelo, Snake fruit, Soursop, and dragon fruit Vitamin C, Fruit extracts
Subjects: T Technology > TX Home economics > Nutrition. Foods and food supply
Divisions: SCHOOL > School of Food Science and Nutrition
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 23 May 2012 00:48
Last Modified: 23 Oct 2017 03:52
URI: http://eprints.ums.edu.my/id/eprint/4128

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