Total Phenolic and Total Flavonoid Contents, and Antioxidant Activity from the Leaves of Syzygium claviflorum
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Abstract
The aims of this research were to analyze total phenolic contents, total flavonoid contents and antioxidant activity from the leaves extract (CS) and the isolated fractions (CS-A–CS-O) of Syzygium claviflorum. The results showed that fraction CS-M had the highest total phenolic content (568.08 ± 9.38 mg GAE/g extracts) while fraction CS-C showed the highest total flavonoids content (139.85 ± 12.52 mg QE/g extract). Antioxidant activity evaluated by DPPH radical scavenging assay indicated that the crude extract (CS) and fraction CS-O showed good activity with IC50 values of 2.16 ± 0.01 and 1.76 ± 0.01 µg/ml, respectively (IC50 value of standard 3.79 ± 0.06 µg/ml). These data indicate that the leaves extract and some fractions of S. claviflorum had high total phenolic and total flavonoid contents, and good antioxidant activity which were suitable to be developed to health promotion products and medical cosmetics in further.
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