3.4.21.9	100% activity during storage at –20°C for at least for 1.5 years	
3.4.21.9	4°C, enzyme immobilized onto amine-modified magnetic nanoparticles, 30 days, 10% loss of activity	
3.4.21.9	4°C, free enzyme, 30 days, 25% loss of activity	
3.4.21.9	The free enzyme has a half life of 8 days at 23°C. The immobilised enzyme has a half life of 29 days at 23°C. The immobilised and glutardialdehyde treated enzyme has a half life of 36 days at 23°C. The free enzyme has a half life of 85 days at 4°C. The immobilised enzyme has a half life of 10 month at 4°C.