Phytochemical screening research on the ethanol extract of soursop (Annona muricata Linn) peel and antioxidant activity was tested using the DPPH method. The purpose of this study was to determine several classes of compounds found in soursop rind and to determine the antioxidant activity of ethanol extract of soursop rind against DPPH free radicals. The results showed ethanol extract of positive soursop fruit skin containing flavonoids, tannins, and terpenoids. of soursop fruit skin extract was carried out by DPPH method results obtained IC50 value of 192.13 µg / mL ± 5.198137 which was categorized as weak.
Phenolic content has a role in antioxidant activity. The higher the phenolic content of a test sample, the higher the antioxidant activity, which is indicated by a smaller IC50 value. Methanol and 70% ethanol are solvents that have been proven to be widely used to extract total plant phenolic compounds. This study aims to determine the phytochemical content and the relationship of total phenolic content with antioxidant activity of ethanol and methanol extract of Schleichera oleosa (Lour.) Oken) bark using UV-Vis spectrophotometry. Schleichera oleosa (Lour.) Oken was extracted by maceration using 70% ethanol and methanol as solvent. Qualitative analysis of phytochemical compounds using specific reagents, analysis of total phenolic content, and antioxidant activity test using the DPPH method using UV-Vis spectrophotometry at 764 nm and 515 nm, respectively. The results of the qualitative test showed that the ethanol and the methanol extract was positive for alkaloids, flavonoids, and phenolics. The results of the analysis of total phenolic content and antioxidant activity showed that the 70% ethanol extract had a total phenolic content of 7.6829 mg gallic acid equivalent/g with IC50 28.5240 ppm and the methanol extract had a total phenolic content of 9.2057 mg gallic acid equivalent/g with IC50 1.6191 ppm. From these results, it was concluded that the higher the total phenolic content, the higher the antioxidant activity.
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