EC 1.1.1.49 From Leuconostoc mesenteroides. In 3.2 M ammonium sulphate. Specific activity: 816 U/mg (25oC, pH 7.4, glucose-6-phosphate). Contaminants: Hexokinase, phosphoglucose isomerase, phosphogluconate dehydrogenase, creatine kinase, glutathione reductase, phosphoglucomutase < 0.001 %. Stable at 4oC for > 4 years.