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Thermostable glucoamylase from Rhizopus oligosporus SK5 mutant was purified in a 3-step purification using Imarsil, activated charcoal and  Sephadex-G-100 to achieve a 40-fold purification. The enzyme was optimally active at pH 5.0 and temperature of 80 °C. It exhibited a half-life of 60  minutes at 70 °C. Its stability was enhanced with addition of Soyabean flour or starch (3% w/w) leading to a retention of over 90% residual activity at 4 °C and 28 °C after 12 weeks of storage. SDS-PAGE analysis of purified enzyme showed two major bands with corresponding molecular weights of 36 kDa and 50 kDa. The study presents thermostable glucoamylase from Rhizopus oligosporus SK5 as a potential in the bioconversion of starch to glucose. KEYWORDS : Enzyme purification, thermostability, Rhizopus oligosporus , glucoamylase,

Long-term anti-diabetic and anti-hyperlipidaemic effects of aqueous stem bark extract of Irvingia gabonensis in streptozotocin-induced diabetic rats