Polyphenolic Compounds and Biological Activities of Leaves and Fruits of Syzygium samarangense cv. ‘Giant Green’ at Three Different Maturities

Syzygium samarangense cv. ‘Giant Green’ is an underutilised fruit that can be found in Malaysia and other Asian countries. Since this not fully commercialised, the information about its potential health benefits limited. Thus, study was carried out to determine polyphenolic contents (total phenolic total flavonoid) biological activities (antioxidant, alpha-glucosidase antibacterial assay) of leaves fruits at different maturity stages. The young, mature old leaves, unripe, half-ripened ripened were analysed. results showed young increased TPC TFC by 35% 41%, over leaves. Similarly, 37% 54% higher unripe compared fruits. In addition, exhibited strongest scavenging activity towards DPPH, NO ABTS radicals with IC50 values increasing 1.6-fold, 1.7-fold 2.3-fold, respectively, However, samples, only able inhibit more than 50% radicals. A comparable trend observed inhibitory assay whereas recorded 81% 99% increases values, from Identically, also a significant effect inhibition zone increase 19%, 36%, 32%, 31% S. aureus, E. faecalis, typhimurium coli, most effective against all tested bacteria while faecalis 1.1-fold Ripened resistant bacteria. These suggest cultivar could candidate for management some diseases coming harmful free or bacterial infection.