GUAVA SEED (PSIDIUM GUAJAVA) AS APOTENTIAL SOURCE OF BIOACTIVE COMPOUNDS
Abstract: Fatty acids profile of extracted lipids (9.8%) from dry guava seed (Psidium guajava) powder showed its high content of C:18 fatty acids (78.7%), the most common saturated and unsaturated fatty acids. The lipids content are relatively high in unsaturated fatty acids (about 65.8%). Antioxidative efficiency of Guava seed powder (GSP) extracts have been studied by applying nine different solvents varying in their polarity. The concentration of total extractable phenolics in dry GSP using different solvent ranged from 834.83 mg 100 g-1 (water extract of defatted GSP) to 1.10 mg 100 g-1 (chloroform-diethyl ether extract of defatted GSP). Water extracts had the highest concentrations of total extractable phenolic compounds with significant different (P<0.05) compared to other solvents, followed by methanol extracts. The response surface method (contour plot) was used to study the radical scavenging activity of different extracts. Out put data showed that, the effectiveness of water and methanolic extracts at time ranging between 15.8 to 9.2 min with decreasing rate ranging between 46 to 38 %, respectively. An antioxidant activity of water and methanol extracts from GSP and BHT (at concentration 0.02 %) in linoleic acid emulsion system was determined at different temperatures. The results indicated that there was no significant difference (P<0.05) observed between antioxidant activity values in emulsions prepared using water phenolic extracts (extracted at 25° C) compared to BHT at all temperatures. Antioxidant efficiency with different concentrations of extracted phenolic compounds either by water or methanol was measured by monitoring the stability of corn germ oil using the Rancimat induction period (RIP). The concentration of 1500 ppm was the minimal concentration gave RIP value similar to BHT.

Keywords: Guava, Phenolics, Fatty acids, Radical scavenging, Antioxidant activity, Rancimat.
Publication year 2007
Organization Name
Author(s) from ARC
Publication Type Journal
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