Urease in insoluble form for converting urea present in a liquid
AssigneeCCI Life Systems, Inc.
InventorsLaurence B. Marantz, Mario G. Giorgianni
Life of this patent
Estimating the term…
Abstract
Urease is adsorbed in an aqueous environment on a urease retaining material selected from the group comprising aluminum oxide and magnesium silicate and is thereafter insoluble so that when contacted by liquid containing urea, the urea is converted into ammonium carbonate while the urease remains adsorbed on the retaining material.
Claims43
A substance for converting dissolved urea present in a liquid;
- means for locating said substance in said liquid;
- said substance comprising a urease retaining material having urease adsorbed thereon for converting urea in said liquid into ammonium carbonate;
- said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said urease retaining material being selected from the group consisting of aluminum oxide and magnesium silicate.
A substance for converting dissolved urea present in a liquid;
- means for locating said substance in said liquid;
- said substance comprising a urease retaining material having urease adsorbed thereon for converting urea in said liquid into ammonium carbonate;
- said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said material consisting of aluminum oxide.
A substance for converting dissolved urea present in a liquid;
- means for locating said substance in said liquid;
- said substance comprising a urease retaining material having urease absorbed thereon for converting urea in said liquid into ammonium carbonate;
- said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said material consisting of magnesium silicate.
A container containing a substance for converting dissolved urea present in a liquid;
- said container being penetratable by said liquid to permit said liquid to contact said subtance in said container;
- said substance comprising a urease retaining material having urease adsorbed thereon for converting urea in said liquid into ammonium carbonate;
- said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said urease retaining material being selected from the group consisting of aluminum oxide and magnesium silicate.
A container containing a substance for converting dissolved urea present in a liquid;
- said container being penetratable by said liquid to permit said liquid to contact said substance in said container;
- said substance comprising a urease retaining material having urease adsorbed thereon for converting urea in said liquid into ammonium carbonate;
- said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said material consisting of aluminum oxide.
A container containing a substance for converting dissolved urea present in a liquid;
- said container being penetratable by said liquid to permit said liquid to contact said substance in said container;
- said substance comprising a urease retaining material having urease adsorbed thereon for converting urea in said liquid into ammonium carbonate;
- said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said material consisting of magnesium silicate.
The method of converting urea dissolved in a liquid to ammonium carbonate comprising the step of contacting said liquid with a substance comprising urease retaining material having urease adsorbed thereon, said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said material being selected from the group consisting of aluminum oxide and magnesium silicate.
The method of converting urea dissolved in a dialysate solution to ammonium carbonate comprising the step of contacting said solution with a substance comprising urease retaining material having urease adsorbed thereon, said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and said material being selected from the group consisting of aluminum oxide and magnesium silicate.
A cartridge for converting urea dissolved in a liquid comprising a container;
- a mixture located within said container of a urease retaining material and urease both in dry granular form, and
- opening means in said container for permitting introduction of said liquid into a mixture to produce adsorption of said urease on said urease retaining material, said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said urease retaining material being selected from the group consisting of aluminum oxide and magnesium silicate.
A cartridge for converting urea dissolved in a liquid comprising a container;
- a mixture located within said container of a urease retaining material and urease both in dry granular form, and
- opening means in said container for permitting introduction of said liquid into a mixture to produce adsorption of said urease on said urease retaining material, said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said urease retaining material consisting of aluminum oxide.
A cartridge for converting urea dissolved in a liquid comprising:
- a container;
- a mixture located within said container of a urease retaining material and urease both in dry granular form, and
- opening means in said container for permitting introduction of a liquid into said mixture to produce adsorption of urease on said urease retaining material, said adsorbed urease being insoluble in said liquid so that it is not dissolved in the liquid contacting said substance and retaining its ability to convert dissolved urea into ammonium carbonate;
- and
- said urease retaining material consisting of magnesium silicate.
Dependencies are inferred from the claim text.