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      Seleksi Ekstrak Aktif Adenostemma platyphyllum sebagai Penghambat Kerja Enzim Tirosinase dan Toksisitas terhadap Artemia salina L.

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      Date
      2023
      Author
      Mutmainnah, Lutfia
      Batubara, Irmanida
      Ilmiawati, Auliya
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      Abstract
      Tirosinase merupakan enzim kunci dalam proses pembentukan melanin. Produksi melanin berlebih dapat menyebabkan hiperpigmentasi dan penggelapan warna kulit. Penelitian ini bertujuan mendapatkan ekstrak aktif yang berpotensi sebagai penghambat kerja enzim tirosinase dan menentukan tingkat toksisitas daun legetan warak (Adenostemma platyphyllum) dari 4 pelarut pengekstraksi. Sampel diekstraksi secara sendiri-sendiri dengan n-heksana, etil asetat, etanol, dan akuades. Kapasitas penghambatan enzim tirosinase diuji dengan substrat L-tirosina dan L-DOPA. Toksisitas ekstrak diuji dengan uji letalitas larva udang (BSLT). Hasilnya menunjukkan bahwa ekstrak etanol memiliki nilai kapasitas tertinggi dalam dua substrat, yaitu 9,74 (AKE)/ g ekstrak untuk substrat L-tirosina dan 17,91 (AKE)/g ekstrak untuk substrat L-DOPA, Hasil uji BSLT menunjukkan 3 ekstrak terbaik dengan nilai LC50 kurang dari 1000 µg/mL, yaitu ekstrak etil asetat, etanol, dan n-heksana. Dengan demikian, ekstrak etanol merupakan ekstrak terbaik untuk kedua uji tersebut.
       
      Tyrosinase is a key enzyme in the process of melanin formation. Excessive melanin production can lead to hyperpigmentation and darkening of skin color. This study aims to obtain active extracts that have the potential to inhibit the work of tyrosinase enzymes and determine the level of toxicity of legetan warak (Adenostemma platyphyllum) leaves from 4 extracting solvents. The samples were extracted individually in n-hexane, ethyl acetate, ethanol, and distilled water. The inhibitory capacity of tyrosinase enzyme was tested using L-tyrosine and L-DOPA substrates. The toxicity of the extract was tested by the brine shrimp lethality test (BSLT). The results showed that ethanol extract gave the highest capacity value in two substrates: 9,74 (AKE)/g extract for L-tyrosine substrate and 17.91 (AKE)/g extract for L-DOPA substrate. BSLT test results showed 3 best extracts with LC50 values of less than 1000 µg/mL, namely ethyl acetate, ethanol, and n-hexane extracts. Thus, ethanol extract is the best extract for both tests.
       
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      http://repository.ipb.ac.id/handle/123456789/122967
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      • UT - Chemistry [2295]

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      Indonesia DSpace Group 
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