Central Composite Statistical Design of Tapioca Starch Hydrolysis using Immobilized Glucoamylase on Mesostructured Cellular Foam Silica (MCF-9.2T-3D) - Joni Agustian; Lilis Hermida; Ade Febriana Syahfitri (Seminar Nasional Teknik Kimia Kejuangan, 2018)