Akar kuning (Fibraurea chloroleuca Miers) merupakah salah satu tumbuhan obat tradisional yang digunakan oleh masyarakat untuk mengobati berbagai penyakit. Untuk menjadikan akar kuning sebagai tumbuhan obat yang sesuai standar, perlu dilakukan standardisasi. Salah satu standardisasi sediaan obat tradisional adalah penetapan kadar salah satu kandungan senyawa aktif dalam akar kuning. Penelitian ini bertujuan untuk mengidentifikasi kandungan flavonoid dan menentukan kadar flavonoid total ekstrak akar kuning. Penelitian ini menggunakan metode maserasi untuk memperoleh ekstrak kental akar kuning dengan pelarut etanol 70%. Untuk menetapkan kadar flavonoid total dari ekstrak akar kuning dilakukan uji kualitatif dan pengukuran absorbansi melalui spektrofotometri UV-Vis dengan larutan standar kuersetin. Hasil penelitian secara kualitatif menunjukkan bahwa akar kuning mengandung flavonoid setelah penambahan AlCl3 1% dengan kadar flavonoid total yang terkandung dalam ekstrak akar kuning melalui pengukuran spektrofotometri Uv-Vis pada panjang gelombang maksimum 442 nm adalah 0,31031 ± 0,013607%. Berdasarkan hasil di atas, maka dapat disimpulkan bahwa ekstrak akar kuning mengandung flavonoid dengan kadar sebesar 0,31031 ± 0,013607%. Akar kuning (Fibraurea chloroleuca Miers) is one of the traditional medicinal plants to treat various diseases. To prepare akar kuning as a medicinal plant according to the standard, standardization needs to be done. One of standardization parameter of traditional medicine is the determination of the content of one of the active compounds in akar kuning. This research aimed to identify flavonoid content and determine the total flavonoid content of akar kuning ekstrak. The study used maceration method with ethanol 70% to prepare crude extract of akar kuning. To determine the total flavonoid content of akar kuning extract, the qualitative study and absorbance measurement using UV-Vis Spectrophotometer with quercetin as standard were performed. The results of qualitative study showed that akar kuning contained flavonoids which evaluated by the addition of 1% AlCl3, with the total flavonoid content of akar kuning extract by UV-Vis spectrophotometry measurements at a maximum wavelength of 442 nm was 0.31031 ± 0.013607%. Based on the results above, it can be concluded that yellow root extract contains flavonoids with levels of 0.31031 ± 0.013607%
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