METABOLISME.ppt - METABOLISME KARBOHIDRAT Metabolisme...

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METABOLISME KARBOHIDRAT
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Metabolisme Karbohidrat Metabolisme karbohidrat pada mamalia dapat dibagi sbb: 1. Glikolisis : oksidasi glukosa atau glikogen menjadi piruvat dan laktat melalui jalan Embden-Meyerhof 2. Glikogenesis : sintesis glikogen dari glukosa 3. Glikogenolisis : pemecahan glikogen . Hasil akhir utama : glukosa (dalam hati ), piruvat dan laktat (dalam otot) 4. Oksidasi piruvat menjadi asetil-ko A : langkah penting sebelum masuknya produk glikolisis ke dalam siklus asam sitrat ( jalan akhir bersama oksidasi karbohidrat, lemak dan protein ) 5. “Hexose monophosphat shunt” : jalan lain oksidasi glukosa disamping jalan Embden-Meyerhof. Fungsi utama : sintesis perantara penting seperti NADPH dan ribosa 6. Glikoneogenesis : pembentukan glukosa atau glikogen bukan dari sumber karbohidrat
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Pencernaan KARBOHIDRAT Tepung Ptialin (saliva ) 20-40% Amilase pankreas 50-80% Maltosa dan 3-9 polimer glukosa Laktosa Sukrosa Maltase dan -dekstrinase usus Laktase (usus) Sukrase (usus) Glukosa Galaktosa Fruktosa
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GLIKOLISIS Glukosa ATP
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