Antioxidant properties of some local medical plants and fruits

Lam, Pooi Wan (2006) Antioxidant properties of some local medical plants and fruits. Universiti Malaysia Sabah. (Unpublished)


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The leaves of Camellia sinensis plant (black tea and green tea), Mentha arvensis (pudina) and peels/fleshes of Citrus limon (lemon) were extracted via reflux and the respective crude extracts were then fractionated using solvent-solvent extraction with 4 different polarity of solvents and yielded petroleum ether (PE), chloroform(CL), n-butanol (BU) and methanol aqueous (AQ) extracts. Phytochemical screenings carried out on sixteen extracts showed that 12 extracts (75 %) contained each of alkaloids and saponins whereas flavonoids were found to occur in 11 extracts (68.8 %). 6 extracts (37.5 %) contained each of tannins and polyphenols substances, whilst anthraquinones present in 10 extracts (62.5 %). Antioxidant properties of CL, BU and AQ extracts of each samples were evaluated using autoxidation linoleic acid assay to determine semiquantitatively of the inhibitory capacity against linoleic acid oxidation relative to butylated hydroxytoluene (BHT). This study indicated that the three extracts of each samples appeared as moderate antioxidants compared to BHT. The relative absorbance values of all these 3 extracts almost similar to each other indicating that they possessed a similar efficiency in inhibitory activity against linoleic acid peroxidation.

Item Type: Academic Exercise
Keyword: Camellia sinensis, lemon, pudina, extraction, reflux, inhibition
Subjects: Q Science > QK Botany
Department: SCHOOL > School of Science and Technology
Date Deposited: 28 Jan 2015 11:06
Last Modified: 24 Oct 2017 11:44

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