| 摘要 |
<p>An enzyme composition comprising an enzyme immobilized by attachment to a particulate inorganic carrier material free from calcium carbonate, calcium oxide and acid soluble components, and comprising less than 1.2% by weight of trivalent metal ions, each particle of the inorganic carrier comprising at least 90% by weight of SiO2 and i) having a porosity of 25-50% by volume based on mercury porosimetry, corresponding to a void volume of about 0.15-0.45 cm3/g, ii) having an average pore radius of 0.02-0.1 νm, iii) having an abrasion resistance of at least 95% when determined according to ASTM No. E 728-80 and preferably having a surface area of at least 15 m2/g, based on mercury porosimetry. The enzymes may be attached to the carrier material by adsorption, optionally followed by intermolecular cross-linking, or by covalent bonding, optionally via a coupling agent. The carrier material may be prepared from naturally occurring inorganic materials not having the desired physical and chemical properties. Graph (1) shows the porosity (in cm3/g plotted against the pore radius in νm) of a naturally occurring inorganic material, and graph (2) shows the porosity of a carrier material prepared from the naturally occurring material by porosity-increasing acid treatment.</p> |
