Antioxidant and tyrosinase inhibitory activities of different parts of guava (<Emphasis Type="Italic">Psidium guajava</Emphasis> L.) |
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Authors: | Dong-Hyun You Ji-Won Park Hyun-Gyun Yuk Seung-Cheol Lee |
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Affiliation: | (1) Department of Biochemistry, University of Kerala, Kariavattom, Thiruvananthapuram, 695581, India; |
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Abstract: | The antioxidant and the tyrosinase inhibitory activities of 4 different solvents (acetone, ethanol, methanol, and water) for
preparation of extracts from guava (branch, fruit, leaf, and seed) were evaluated by measuring total phenolic contents (TPC),
DPPH radical scavenging activity, ABTS radical scavenging activity, reducing power (RP), and tyrosinase inhibitory activity.
The extracts of branch and leaf showed relatively higher antioxidant properties than those of fruit and seed. The highest
TPC (141.28 mg/g gallic acid equivalents), DPPH radical scavenging activity (IC50=34.01 μg/mL), ABTS radical scavenging activity (IC50=3.23 μg/mL), and RP (IC50= 75.63 μg/mL) were found in acetone extract of leaf, while water extract of seed had the lowest antioxidant activity. The
tyrosinase inhibitory activity of ethanol extract from guava leaf was 69.56%, which was the highest activity among the extracts.
These results indicate that useful bioactive substances exist in the guava branch as well as leaf extracts. |
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