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 (Unpublished)


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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: ADMIN ADMIN
Date Deposited: 26 Sep 2012 16:52
Last Modified: 13 Oct 2017 09:24

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