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Penelitian ini secara umum bertujuan untuk mengetahui potensi tanaman Cengkodok (Melastoma malabathricum L) sebagai antioksidan alami, sedangkan tujuan khususnya adalah untuk untuk menentukan rendemen, total antosianin, dan ekstrak yang memiliki aktivitas antioksidan terbaik, serta menguji aktivitas antioksidan dan stabilitas warna dari aktivitas antioksidan yang terbaik. Ektraksi dilakukan dengan dua cara yaitu ekstraksi cara basah dan ekstraksi cara kering. Ekstraksi menggunakan pelarut etanol 70% dengan penambahan asam sitrat dengan perbandingan bahan dan pelarut 1:4. Selanjutnya dilakukan uji kestabilan antioksidan dan warnanya dari ekstrak yang memiliki aktivitas antioksidan terbaik, dan dilakukan ANAVA (Analisa Varian). Aktivitas antioksidan terbaik didapatkan dari perlakuan ekstraksi cara basah dengan rendemen 32,6142%, total antosianin 33,3279 mg/ 100 gr sampel, dan aktivitas antioksidan sebesar 95,2234%. Kestabilan antioksidan dan warna antosianin semakin menurun seiring meningkatnya pH, meningkatnya kadar gula, dan tingginya suhu pemanasan. Kemudian ANAVA menyatakan hasil bahwa pada kestabilan antioksidan berbeda nyata pada taraf 5% pada perlakuan pH, kadar gula, dan suhu pemanasan. Abstract This study was aimed to reveal the potency of weeds Cengkodok (Melastoma malabathricum L) as natural antioxidant source, while purpose specific for determine the extract yield, anthocyanin total, the best antioxidant activity possessed by an extract and its colour stability.. Procedure of extraction were conducted in two methods; wet extraction and dry (powder) extraction. Specifically, it was used 70% ethanol solvent and citric acid with the proportion between substance and solvent was 1:4. Furthermore, the test was done on the antioxidant stability and the colour of essence that has optimal antioxidant activity and then it was analyzed using ANAVA (Analysis of Variant). The optimal antioxidant activity was obtained from wet extraction treatment with yield 32,6142%, anthocyanin total 33,3279 mg/100 Egr of sample, and antioxidant activity was 95,2234%. Antioxidant stability and anthocyanin decreased while pH and glucose was increased, and heating temperature was also increased. ANAVA showed that the antioxidant stability was totally different on the level of 5% on the treatment of pH, glucose, and heating temperature.

PENGARUH EKSTRAKSI CARA BASAH DAN CARA KERING TERHADAP AKTIVITAS ANTIOKSIDAN EKSTRAK CENGKODOK (MELASTOMA MALABATHRICUM L.)