Skripsi
POTENSI PENGEMBANGAN KULIT RAMBUTAN (Nephelium lappaceum L.) MENJADI SEDIAAN TEH HERBAL
Rambutan peel (Nephelium lappaceum L.) is an organic waste that has the potential to be used as a source of natural antioxidants due to its high phenolic and flavonoid content. This study aims to determine the total phenolic and flavonoid content, antioxidant activity, and quality characteristics of rambutan peel tea. Rambutan peel samples were dried, ground, and brewed using hot water at 90 °C for 5 minutes, then analyzed for total phenolic content using the Folin–Ciocalteu method and flavonoid content using the aluminum chloride method. Antioxidant activity was tested using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) methods. Sample characteristics were determined by testing water content, ash content, and analysis of heavy metals lead (Pb) and cadmium (Cd) using atomic absorption spectrophotometry (AAS). The results showed that rambutan peel tea had a total phenolic content of 344.07 mgGAE/g and a flavonoid content of 7.96 mgQE/g, higher than commercial tea (Sariwangi tea and Moringa leaf tea). The antioxidant activity of the DPPH method showed an IC₅₀ value of 0.792 mg/mL, while the FRAP method showed a TEAC (Trolox equivalent antioxidant capacity) value of 31.02±1.42 mgTE/g (milligrams of Trolox equivalent per gram). The characteristics of the sample showed a water content of 9.09±0.75%, an ash content of 2.04±0.24%, and a Pb content of
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