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This study was carried out to investigate the phytochemical screening of the methanol crude extracts of the leaves, twigs, and heartwoods of eight  Syzygium  species ( S. filiforme  var.  filiforme ,  S. papillosum ,  S. griffithii ,  S. pseudoformosum ,  S. claviflorum  var.  claviflorum ,  S. glaucum ,  S. syzygioides,  and  Eugenia  Sp. 57). The analysis revealed the presence of alkaloids, flavonoids, phenols, steroids, terpenes, and tannins except saponins in all plant extracts. Evaluation of the antioxidant activities were tested using DPPH, FRAP, and ABTS assays. All plant extracts showed good DPPH scavenging activity with the percentage inhibition more than 70 % at 100 ppm. The leaves and twigs of the methanol extracts of  S. griffithii  exhibited the most potent ferric ion reducer ranging from 1.03 ± 0.03 mM to 7.52 ± 0.49 mM and 1.43 ± 0.12 mM to 9.68 ± 0.38 mM FRAP equivalent, respectively. The heartwoods crude extract of  S. syzygioides  showed the most potent ferric ion reducer ranging from 1.20 ± 0.01 mM to 10.47 ± 0.12 mM FRAP equivalent. All of the leaves crude extracts showed potential antioxidant activities towards ABTS assay. The methanol extracts of the leaves of  S. glaucum  showed good SC 50  value (116.90 mM) followed by  S. papillosum  (S2LM, SC 50  value = 132.70 mM)  and Eugenia  Sp. 57 (S4LM, SC 50  value = 143.10 mM). The twigs crude extracts of  S. syzygioides  (S8TM) and  S. griffithii  (S3TM) showed excellent antioxidant activity towards ABTS assay with the SC 50  values of 130.60 mM and 145.40 mM, respectively. The crude extracts of  S.   syzygioides  exhibited good antioxidant activity among the heartwoods extracts with the SC 50  value of 96.20 mM.

Phytochemical screening and antioxidant activities of Methanol extracts from eight Syzygium species