Averrhoa bilimbi is one of the Indonesian indigenous plants containing phenolic and flavonoids which exhibit several ethnopharmacological effects i.e. antidiabetic, anti-microbial, anti-inflammatory, cytotoxic, anti-oxidant, antifertility, and antibacterial activities. However, the optimum solvent for extracting these compounds using percolation have not been reported, yet. This research was aimed to evaluate the various concentrations of ethanol solvents towards total phenolic (TPC) and total flavonoid content (TFC). Extraction was carried out using percolation technique with ethanol solvent ratio of 50%, 70%, and 96%. The phytochemical screening, thin layer chromatography, total flavonoids, and total phenolic levels were obtained from the concentrated extract. The TPC and TFC were determined using visible spectrophotometry method. Phytochemical screening study indicated that ethanolic extract contains classes of flavonoids, phenolic, alkaloid, saponins, and steroids. The TFC of ethanolic extract with 50%, 70%, and 96% solvent concentrations were investigated at 62.74, 64.81 and 59.1 mg RTE / g extract, respectively while the TPC were recorded as follows: 103.79; 119.47; 110.10 mg GAE / g extract. Hence, 70% ethanol were higher among others, and therefore remains as optimum solvent for the extraction of A. bilimbi leaves.

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Leaves of malay apple (Syzygium malaccense L.) and water apple (Syzygium aqueum) are plants that contain phenolic and flavonoid compounds which have antioxidant activity. The aim of this study was to determine the differences in total phenolic content, total flavonoids and antioxidant activity of ethanol extract of malay apple leaves and water apple leaves. The extraction method uses maceration with 96% ethanol solvent in a ratio of 1:15. The ethanol extract of malay apple leaves and water apple was tested for total phenolic content using the Folin-Ciocalteu method, total flavonoids using the colorimetric method and antioxidant activity using the DPPH method. Qualitative identification of quercetin compounds was performed by densitometry tlc. In the phenolic and flavonoid content test, the total sample extract was made with a concentration of 5000 ppm. In the antioxidant activity test of the extract samples, a series of concentrations of 80, 100, 120, 140 and 160 ppm were made. The results showed that the total phenolic content in the ethanol extract of malay apple leaves has an average of 12.5149 mgGAE/g and water apple leaves of 14.3207 mgGAE/g. The total flavonoid content in the ethanol extract of malay apple leaves has an average of 9.1613 mgQE/g and water apple leaves of 16.5893 mgQE/g. The ethanol extract of malay apple leaves has antioxidant activity with an average IC50 of 138.3315 ppm and water apple leaves of 117.6745 ppm. In qualitative identification densitometry the Rf value of quercetin is 0,68; ethanol extract of malay apple leaves is 0,68 and water apple leaves is 0,85. The results of the independent statistical T test showed that there were differences in the total phenolic content, total flavonoids and antioxidant activity in the ethanol extract of  malay apple leaves and water apple leaves.

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