Combination of lemongrass extract and green tea infusion is expected to produce functional beverage that has potential antioxidant activity as compared to individual materials. This research was aimed to investigate the appropriate solvent type and extraction methods to produce lemongrass extract with highest antioxidant activity and also to investigate the antioxidant characteristic of beverages prepared from a mixture of lemongrass extract and green tea. Lemongrass were subjected to extraction under reflux and maceration using three type of solvents (distilled water, ethanol, and ethyl acetate). The resulting extracts were assessed for their total phenolic content, total flavonoid content, and antioxidant activity. Extraction under reflux and using ethanol as solvent resulted in extract with best antioxidant activity (IC50=158.70±47.88 mg/L for reflux method and 103.73±8.03 mg/L for ethanol). This extract was combined with green tea with several ratios (lemongrass extract to green tea [w/w] = 1:3; 1:2; 1:1; 2:1; 3:1). Four level of stevia were used in the beverages (0, 200, 400, 600 ppm). Beverages made with lomogass: tea ratio of 1:3 and 1:1 (w/w) and 600 ppm stevia turned out to be beverages with the highest antioxidant activity (IC50=271.83±44.48 mg/L and 287.15±36.25 mg/L for ratio 1:3 and 1:1 [w/w] consecutively, 301.59±80.89 mg/L for stevia level 600 ppm). Hedonic testing on beverages revealed that beverage made from lemongrass: tea ratio 1:1 [w/w] ratio with addition of stevia at 600 ppm is the most preferred based on colour, aroma, and overall acceptance. ABSTRAKKombinasi ekstrak serai dan teh hijau diharapkan dapat menghasilkan minuman fungsional yang memiliki potensi antioksidan lebih tinggi dari penyusunnya. Penelitian ini bertujuan untuk mempelajari jenis pelarut dan metode ekstraksi yang dapat menghasilkan ekstrak serai dengan aktivitas antioksidan tertinggi serta mempelajari karakteristik antioksidan dari minuman campuran ekstrak serai dan teh hijau. Serai diekstraksi dengan metode refluks dan maserasi menggunakan tiga jenis pelarut (akuades, etanol, dan etil asetat). Kandungan total fenol, flavonoid, dan aktivitas antioksidan dari ekstrak yang dihasilkan diukur. Ekstraksi dengan refluks menggunakan pelarut etanol menghasilkan ekstrak dengan aktivitas antioksidan tertinggi (IC50=158.70±47.88 mg/L untuk metode refluks dan 103.73±8.03 mg/L untuk etanol). Ekstrak ini dikombinasikan dengan teh hijau dalam beberapa rasio (ekstrak serai: teh hijau [w/w] = 1:3; 1:2; 1:1; 2:1; 3:1). Empat level stevia digunakan dalam minuman (0, 200, 400, 600 ppm). Minuman dengan rasio 1:3 dan 1:1 [w/w], serta level stevia 600 ppm merupakan minuman dengan aktivitas antioksidan tertinggi (IC50=271.83±44.48 mg/L dan 287.15±36.25 mg/L untuk rasio 1:3 dan 1:1 [w/w] berurutan, serta 301.59±80.89 mg/L untuk level stevia 600 ppm). Uji hedonik menunjukkan bahwa minuman dengan rasio 1:1 [w/w] dengan level stevia 600 ppm adalah yang paling disukai dari segi warna, aroma, dan penerimaan keseluruhan.
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