OPTIMASI PROSES EKSTRAKSI PEKTIN DAMI BUAH NANGKA (Artocarpus heterophyllus Lamk) Optimizing of Pectin Extraction Process from Jackfruit Rags (Artocarpus heterophyllus Lamk) - Putra, I Nengah Kencana (Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, 2012)