Abstract:
A method of applying an organic acid reagent having limited transolubility in organic solvents, aqueous solvents, and mixtures thereof to a component of a diagnostic test device by mixing an organic acid reagent and an amine to form a salt complex, dissolving the salt complex in a solvent to release the organic acid reagent into the solvent, and applying the solvent to the component of the diagnostic test device such that the organic acid reagent present in the solvent becomes integrated into the diagnostic test device. The amine is represented by the formula HmNRn wherein m is 0, 1, or 2; n is 1, 2, or 3; the sum of m and n is 3; and R is an independently selected group which renders the salt complex soluble in aqueous solvents, organic solvents, or mixtures thereof. The amine is also represented by the formula NR4+ wherein R is an independently selected group which renders the salt complex soluble in aqueous solvents, organic solvents, or mixtures thereof. The organic acid reagent is selected from a carboxylic acid, a sulfonic acid, a phosphoric acid, and mixtures thereof. Preferred reagents are dyes like pyragallol red. In a specific embodiment the diagnostic test device is a paper test strip.
Abstract:
A microliter liquid sample, particularly a biological sample, is analyzed in a device employing centrifugal and capillary forces. The sample is moved by capillary forces into one or more metering wells which define the amount of the sample to be analyzed in subsequent steps. The defined amount of the sample is transferred from the metering wells to one or more conditioning and reagent wells for measuring the amount of an analyte contained in each metered amount of the sample.
Abstract:
An assay for the determination of protein in an aqueous test fluid which combines the test fluid with a buffer and a dye. The buffer is selected from citrulline, malonic acid, cyanoacetic acid, citraconic acid, methyl phosphonic acid, sarcosine, saccharin, or combinations thereof. The buffer is added in sufficient quantity to maintain the pH of the assay including the test fluid at a selected target pH range within a range of from about 2.0 to about 3.0. The dye has a pKa which enables it to operate as a protein indicator at the target pH range. The dye also has affinity for protein such that it will provide a detectable response in the presence of greater than about 15 mg/dL protein to thereby render the assay suitable for the detection of total protein in the test fluid. The buffer and dye may be absorbed in a test strip of absorbent material.
Abstract:
Novel aminoalkylthiodibenzoxepins, physiologically tolerable acid addition salts thereof, a method of preparing same, pharmaceutical and veterinary preparations including same and methods of treating by administering same are disclosed. These compounds are useful as analgesic, antidepressant and anticonvulsant agents. A process for selectively reducing olefins by alkaline earth metals in loweralkanols is also disclosed.
Abstract:
Novel aminoalkylthiodibenzothiepins and related compounds, physiologically tolerable acid addition salts thereof, a method of preparing same, pharmaceutical and veterinary preparations including same and methods of treating by administering same are disclosed. These compounds are useful as antidepressant, analgetic, and anticonvulsant agents.
Abstract:
Novel substituted 1,3-dihydrospiro[benzo(c)thiophene]s and methods of preparing the same are described. These compounds are useful as antidepressants and tranquilizers and intermediates therefor.
Abstract:
Novel spiro[indoline-3,4'-piperidine]s and related compounds and methods of preparing same are described. These compounds are useful as antidepressants, anticonvulsants and tranquilizers. Also described is a novel method of preparing indoline rings.
Abstract:
A readhead for a photometric diagnostic instrument includes a holder configured for receiving reagent sample media therein. The sample media has a plurality of test areas configured to react with, and change color, according to an amount of an analyte in a sample. The holder is sized and shaped for forming an indexed fit with the sample media. One or more light sources are configured to emit light onto the test areas. First and second polarized light filters are respectively disposed between the light sources and the test areas, and between the test areas and one or more light detectors, so that the light detectors receive diffuse, non-specular reflections of the light from the test areas, while substantially preventing the light detectors from receiving specular reflections of the light.
Abstract:
A microfluidic device for analyzing biological samples is provided with a sample inlet section including an inlet port, a capillary passageway communication with the inlet port and with an inlet chamber. The inlet chamber includes means for uniformly distributing the sample liquid across the inlet chamber and purging the air initially contained therein.
Abstract:
A dry phase device separates high density lipoprotein (HDL) from a blood (serum or plasma) sample. The device contains a fluid permeable material having dispersed therein finely divided, porous silica or silicate particles as selective absorbant for HDL. By combining the device with a second layer designed to remove very low density lipoproteins/chylomicrons from the blood, and a third layer containing means for quantitative cholesterol detection, there is provided a test device for the direct determination of low density lipoproteins cholesterol.