<![CDATA[ABSTRAK Tingginya reaksi oksidasi menyebabkan terbetuknya radikal bebas dalam tubuh manusia yang dapat memicu berbagai penyakit degeneratif seperti diabetes mellitus. Tanaman endemik Sulawesi Utara salah satunya yaitu daun leilem telah terbukti pada penelitian sebelumnya memiliki aktivitas sebagai antioksidan. Pada penelitian sebelumnya telah diuji aktivitas antioksidan ekstrak serta beberapa fraksi daun leilem dan diperoleh hasil bahwa ekstrak daun leilem memiliki aktivitas antioksidan paling baik. Untuk itu penelitian ini bertujuan untuk melanjutkan penelitian sebelumnya dari daun leilem dengan melihat aktivitas penurunan kadar glukosa dari ekstrak daun leilem secara invitro dengan metode spektrofotometri UV-Vis menggunakan pereaksi Nelson Somogyi dengan kadar glukosa yang digunakan yaitu 40 ppm dan konsentrasi ekstrak yang digunakan adalam 20, 40, 60, 80 dan 100 ppm serta menguji kadar total fenol dan flavonoid pada ekstrak etanol daun leilem. Hasil penelitian diperoleh bahwa ekstrak daun leilem dapat menurunkan kadar glukosa secara in vitro. Pada ekstrak dengan konsentrasi 20 ppm kadar glukosa menurun sebanyak 50,77%, ekstrak 40 ppm kadar glukosa menurun sebanyak 55,55%, 60 ppm ekstrak kadar glukosa turun sebanyak 60,45%, ekstrak 80 ppm kadar glukosa turun sebanyak 65,12 ppm dan ekstrak dengan konsentrasi 100 ppm kadar glukosa turun sebanyak 70,55%. Untuk kadar total fenol pada ekstrak yaitu 143,105 mg GAE/g dan total flavonoid pada ekstrak etanol daun leilem yaitu 76,265 mg QE/g ABSTRACT High oxidation reactions cause the formation of free radicals in the human body which can trigger various degenerative diseases such as diabetes mellitus. One of the endemic plants of North Sulawesi, leilem leaves, has been proven in previous research to have antioxidant activity. In previous research, the antioxidant activity of extracts and several fractions of leilem leaves had been tested and the results showed that leilem leaf extract had the best antioxidant activity. For this reason, this research aims to continue previous research on leilem leaves by looking at the activity of reducing glucose levels from leilem leaf extract in vitro using the UV-Vis spectrophotometric method using Nelson Somogyi reagent with the glucose level used being 40 ppm and the extract concentration used being 20, 40, 60, 80 and 100 ppm and tested the total phenol and flavonoid levels in the ethanol extract of leilem leaves. The research results showed that leilem leaf extract could reduce glucose levels in vitro. In the extract with a concentration of 20 ppm the glucose level decreased by 50.77%, in the 40 ppm extract the glucose level decreased by 55.55%, in the 60 ppm extract the glucose level decreased by 60.45%, in the 80 ppm extract the glucose level decreased by 65.12 ppm and extracts with a concentration of 100 ppm glucose levels decreased by 70.55%. The total phenol content in the extract is 143.105 mg GAE/g and the total flavonoid content in the ethanol extract of leilem leaves is 76.265 mg QE/g]]>
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