The purpose of this research was to observe of phytochemical content and antioxidant activity of chinese water chesnut (Eleocharis dulcis) and giant molesta (Salvinia molesta) extracts with three solvents of different levels of polarity. This study used an experimental laboratory method and data analysis was carried out descriptively. Some of the steps carried out include the stages of sampling, sample extraction, calculation of extract extracts, quantitative phytochemical analysis (flavonoid content, phenol content, phenolic content, and tannin content), and test of antioxidant activity (DPPH, ABTS and Reducing ability. The results showed that extracts of extract using ethanol in water chesnut and giant molesta had the highest values of 2.01% and 2.26%. Quantitative phytochemical tests on water chesnut and giant molesta extract showed that ethanol solvents at flavonoid levels had the highest values of 288.75 ppm and 267 ppm. The results of antioxidant activity with the water chesnut and giant molesta extracts had very weak IC50 values in n-hexan solvents valued at 1977.22 ppm and 3211.2 ppm. Water chesnut of extract had the highest ABTS value in ethyl acetate solvents at a concentration of 1000 ppm at 85.253% and in giant molesta extract at a concentration of 1000 ppm using ethanol solvent had the highest value of 76.665%. Ethanol extract in water chesnut extract and giant molesta had the highest reducing ability power with a mean absorbance of 0.477 and 0.520. The best solvent for extracting water chesnut and giant molesta were ethanol.
Key words: Antioxidant, water chesnut, giant molesta, phytochemical
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