title: Studies on glucoamylase produced from Aspergillus awamori (NRRL-3112) and their effect on saccharification of potato starch.
abstract: Efficiency of an enzymatic starch saccharification process depends not only on the activity of the glucoamylase but also its purity. About 96.82% unwanted proteins present in 2-day old culture broth of A. awamori NRRL-3112 (grown in MYGP medium) were separated by precipitation with ammonium sulphate which was followed by dialysis. More than 80% activity of the glucoamylase was recovered. Three protein fractions (A, B, C) were identified using gel permeation chromatography. Fractions A and B showed comparatively higher glucoamylase activity than fraction-C. Moreover, fraction-B showed no product inhibition. The optimum temperature and pH of the purified enzyme (fraction-B) were 60 degrees C and 4.0 respectively. The saccharification efficiency of potato pulp was more in case of using purified glucoamylase (fraction-B) as compared to that of crude enzyme.
authors.affiliation: Chemical Engineering Department, Indian Institute of Technology, Kharagpur.
authors.forename: S
authors.initials: S
authors.lastname: Kumar Soni
authors.forename: M
authors.initials: M
authors.lastname: Venkateswara Rao
authors.forename: D
authors.initials: D
authors.lastname: Das
mesh_terms: D001230:Aspergillus / Q000201:enzymology*; D005087:Glucan 1,4-alpha-Glucosidase / Q000302:isolation & purification / Q000378:metabolism*; D011198:Solanum tuberosum; D013213:Starch / Q000378:metabolism*
chemical_list: D013213:Starch; D005087:Glucan 1,4-alpha-Glucosidase