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    Isolasi dan Elusidasi Struktur Kimia Flavonoida dari Daun Pala (Myristica Fragrans Houtt) dan Uji Aktivitas Antioksidan

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    Date
    2015
    Author
    Ginting, Binawati
    Advisor(s)
    Simanjuntak, Partomuan
    Marpaung, Lamek
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    Abstract
    Research on plant leaves Myristica fragrans Houtt Pala was aimed to find a chemical compound and antioxidant activity with 1,1-diphenyl-2-picryl-hydrazil (,-diphenyl--picrylhidrazyl) atau DPPH radical-scavenging methods. Extraction have done by maceration using the methanol solvent, methanol extract was added ethylacetate solvent and filtered. Ethylacetate extract partioned with methanol : n-hexane (1:1) and then ethylacetate fractions were hydrolised with HCl 6%. The total flavonoid yielded was separated using column chromatography with silica gel 60 as stasionary phase and n-hexane : ethylacetate as mobile phase (gradient elution). After that coloumn chromatography find to three flavonoid compounds and then do identify with UV, FTIR, 1H-NMR, 13C-NMR, DEPT and NMR-2D (COSY, HMQC and HMBC). That compound called as 3,5,7,4-tetrahydroxy-dihydroflavonol or dihydrocaempferol; 3,5,7,4-tetrahydroxy flavonol or Kaempferol and 3,5,7,3,4-pentahydroxy flavonol or Quercetin with antioxidant activity 9,75; 6,85 and 4,85 ppm respectively.
     
    Penelitian terhadap daun Pala (Myristica fragrans Houtt) bertujuan untuk mengetahui senyawa kimia (struktur kimia) dan aktivitas antioksidan dengan menggunakan 1,1-diphenyl-2-picryl-hydrazil (,-diphenyl--picrylhidrazyl) atau DPPH radical-scavenging. Ekstraksi dilakukan dengan cara maserasi menggunakan pelarut metanol, ekstrak pekat metanol ditambahkan pelarut etilasetat dan disaring. Ekstrak etil asetat dipartisi dengan metanol : n-heksana (1:1), kemudian ekstrak pekat etil asetat dihidrolisis dengan HCl 6%. Total flavonoid yang diperoleh dipisahkan menggunakan kromatografi kolom dengan fasa diam silika gel 60 dan fasa gerak campuran n-heksana : etil asetat (elusi gradien). Hasil kromatografi kolom ditemukan tiga senyawa flavonoid yang dilanjutkan dengan identifikasi dengan analisis UV, FT-IR, 1H-NMR, 13C-NMR, DEPT dan NMR-2D (COSY, HMQC dan HMBC). Senyawa yang ditemukan tersebut dinyatakan sebagai 3,5,7,4-tetrahidroksi-dihidroflavonol atau dihidrokaempferol; 3,5,7,4-tetrahidroksi flavonol atau Kaempferol dan yaitu 3,5,7,3,4-pentahidroksi flavonol atau Quercetin dengan aktivitas antioksidan berturut-turut 9,75; 6,85 dan 4,85 ppm.

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    http://repositori.usu.ac.id/handle/123456789/44002
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    • Doctoral Dissertations [102]

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    Repositori Institusi Universitas Sumatera Utara (RI-USU)
    Universitas Sumatera Utara | Perpustakaan | Resource Guide | Katalog Perpustakaan
    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV