Determination of antioxidant activities in pomelo peel (citrus grandis) essential oil

Wong, Yuet Yeng (2009) Determination of antioxidant activities in pomelo peel (citrus grandis) essential oil. Universiti Malaysia Sabah. (Unpublished)

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Abstract

Essential oil was extracted out from pomelo (Citrus grandi's) peels by hydro distillation and solvent extraction method. The percentage of oil yields obtained from the pomelo peel varied from 2.49 ± 1.23% to 4.2 ‡ 0.98%. The volatile components of the essential oils were characterized by means of GC-MS. GC-MS identified 43 compounds present in the essential oils, with main components being d-limonene (62.17-75.24%), a-mycrene (1.08-7.55%), a-linalool (0.93-3.26%), citral (0.55-4.14%), and terpinolene (0.98-2.71%). Differences in compositions and contents were observed in the essential oils extracted by these two different methods. Antioxidant and radical scavenging properties were tested by using 1,1-dlphenyl-2-picrylhydrazyl (DPPH) assay, ferric reducing ability of plasma (FRAP), and β-carotene bleaching test. To examine the oils' relative activities compared with that of a standard antioxidant, BHT was employed. In the DPPH assay, the essential oils showed a free radical inhibition ranging from 86.174 ± 1.067%-40.260 ·± 0.481%. In the FRAP assay, it was noticed that essential oils from the Citrus grandis have an average reducing capacity of 0.047 ± 0.001-0.270 ± 0.003 mM/mg oil. For ~-carotene bleaching test, both hydro distilled and solvent extracted essential oils showed effective antioxidant activities, which were 83.817 ‡ 0.368% and 70.794 ± 0.596% respectively.

Item Type: Academic Exercise
Uncontrolled Keywords: Pomelo, Citrus grandis, Solvent extraction, Pomelo peel, Essential oils, Volatile components
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > School of Food Science and Nutrition
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 26 Sep 2012 08:52
Last Modified: 13 Oct 2017 01:24
URI: http://eprints.ums.edu.my/id/eprint/4927

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