Method of preparing particles suitable for tabletting into diagnostic reagents
First Claim
1. A process for the preparation of a completely water-soluble, solid, labile biochemical-containing diagnostic reagent, comprising the steps of:
- (a) providing an aqueous solution of labile biochemical;
(b) providing particulate, inert, completely water-soluble solid bulking agent;
(c) atomizing and uniformly spraying said aqueous solution of labile biochemical in the form of fine droplets, in a small amount, over an extended time period, onto said particulate bulking agent, the latter undergoing continuous agitation while in contact with a surrounding gaseous medium, and continuously evaporating water from said aqueous solution of labile biochemical while incorporating said labile biochemical on said particulate bulking agent under conditions effective to provide uniform distribution of said labile biochemical on said particulate bulking agent and to prevent substantial agglomeration of said bulking agent or build-up of substantial wetness in said bulking agent;
(d) drying resultant labile biochemical-coated bulking agent to the desired dryness; and
(e) then forming resultant dried labile biochemical-coated bulking agent into a tablet suitable for a diagnostic test reagent, said tablet having a predetermined rate of dissolution.
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Abstract
A completely water-soluble, solid, labile biochemical-containing diagnostic reagent is prepared without the need of a lyophilization step, by spraying, preferably by a fluidized bed process, an aqueous solution of labile biochemical, e.g., an enzyme, onto small particles, e.g., lower than 20 mesh, of an inert, completely water-soluble solid bulking agent, e.g., mannitol; drying the resultant labile biochemical-coated bulking agent to the desired dryness; and then forming resultant dried labile biochemical-coated bulking agent into a tablet suitable for a diagnostic test reagent, said tablet having a predetermined rate of dissolution.
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Citations
42 Claims
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1. A process for the preparation of a completely water-soluble, solid, labile biochemical-containing diagnostic reagent, comprising the steps of:
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(a) providing an aqueous solution of labile biochemical; (b) providing particulate, inert, completely water-soluble solid bulking agent; (c) atomizing and uniformly spraying said aqueous solution of labile biochemical in the form of fine droplets, in a small amount, over an extended time period, onto said particulate bulking agent, the latter undergoing continuous agitation while in contact with a surrounding gaseous medium, and continuously evaporating water from said aqueous solution of labile biochemical while incorporating said labile biochemical on said particulate bulking agent under conditions effective to provide uniform distribution of said labile biochemical on said particulate bulking agent and to prevent substantial agglomeration of said bulking agent or build-up of substantial wetness in said bulking agent; (d) drying resultant labile biochemical-coated bulking agent to the desired dryness; and (e) then forming resultant dried labile biochemical-coated bulking agent into a tablet suitable for a diagnostic test reagent, said tablet having a predetermined rate of dissolution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. In the tabletting granulation of a diagnostic reagent comprising the steps of passing particulate material to a tabletting machine and then tabletting the particulate material, the improvement which comprises employing at least in part a product produced by a process comprising the steps of:
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(a) providing an aqueous solution of labile biochemical; (b) providing particulate, inert, non-hygroscopic, completely water-soluble solid bulking agent; (C) atomizing and uniformly spraying said aqueous solution of labile biochemical in the form of fine droplets, in a small amount, over an extended time period, onto said particulate bulking agent, the latter undergoing continuous agitation while in contact with a surrounding gaseous medium, and continuously evaporating water from said aqueous solution of labile biochemical while incorporating said labile biochemical on said particulate bulking agent under conditions effective to provide uniform distribution of said labile biochemical on said particulate bulking agent and to prevent substantial agglomeration of said bulking agent or build-up of substantial wetness in said bulking agent; and (d) drying resultant labile biochemical-coated bulking agent to the desired dryness.
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Specification