Abstract:
A disposable, dry chemistry analytical system is disclosed which is broadly useful for the detection of a variety of analytes present in biological fluids such as whole blood, serum, plasma, urine and cerebral spinal fluid. The invention discloses the use of the reaction interface that forms between two liquids converging from opposite directions within a bibulous material. The discovery comprises a significant improvement over prior art disposable, analytical reagent systems in that the detectable reactant zone is visually distinct and separate from the unreacted reagents allowing for the use of reaction indicators exhibiting only minor changes as well as extremely high concentrations of reactants. In addition, staged, multiple reagents can be incorporated. Whole blood can be used as a sample without the need for separate cell separating materials. Finally, the invention is useful for the detection of analytes in a broad variety of materials such as milk, environmental samples, and other samples containing target analytes.
Abstract:
A complex including magnetic particle bound to a metal colloid. The complex may be part of a reagent for use in a method for determining analytes. The reagent may include a binding partner specific for an analyte. The reagent may further include a first label that is distinguishable from a second label that is used to detect the analyte. The reagent is used in kits and methods for detecting analytes in samples. The methods include immunoassay methods, including method where the first label is used to calibrate the assay.
Abstract:
A disposable, dry chemistry analytical system is disclosed which is broadly useful for the detection of a variety of analytes present in biological fluids such as whole blood, serum, plasma, urine and cerebral spinal fluid. The invention discloses the use of the reaction interface that forms between two liquids converging from opposite directions within a bibulous material. The discovery comprises a significant improvement over prior art disposable, analytical reagent systems in that the detectable reactant zone is visually distinct and separate from the unreacted reagents allowing for the use of reaction indicators exhibiting only minor changes as well as extremely high concentrations of reactants. In addition, staged, multiple reagents can be incorporated. Whole blood can be used as a sample without the need for separate cell separating materials. Finally, the invention is useful for the detection of analytes in a broad variety of materials such as milk, environmental samples, and other samples containing target analytes.
Abstract:
The present invention provides devices and methods for determining the presence or absence of pathogens in a biological sample and for the concurrent determination of the antimicrobial susceptibility of pathogens present. The devices and methods of the present invention are able to make the determinations without pre-selection of target bacteria. Instead, all organisms from the sample are applied to the device. In wells where one or more antimicrobial agents are present only pathogens resistant to the antimicrobial agent grow. This allows the user to determine the presence of target pathogens and concurrently determine the resistance patterns of the organisms without the need to subculture the organisms. The present invention also provides methods of performing a business service of performing the determinations described above, and kits containing the devices and descriptions of the methods.
Abstract:
La cuantificacion de componentes biologicos y químicos en soluciones de muestra acuosas, tales como sangre completa, suero, plasma y orina, es importante afin de realizar un diagnostico correcto y a tiempo de diferentes enfermedades y de controlarel progreso de los tratamientos médicos de enfermedades. En muchoscasos, los analitos que se miden se encuentran presentes solo en pequenas cantidades y, con frecuencia, se mezclan con niveles mucho mayores de componentes queson irrelevantes o queinte rfieren. Algunos componentes, tales como globulos rojos, impiden el análisis de la muestra si se encuentran presentes. De igualmodo, resultan problemáticos los reactivos y los indicadores que se utilizan para detectar y medir analitos, loscuales est án muy coloreados y se asemejan alos productos de reaccion en términos de sus espectros de absorbancia. Además, la medicion de los analitos a menudo requiere reactivos incompatibles ymultiples que deben almacenarse separadamente yagregarse en forma secuencial. Cualesquiera de éstos factores pueden complicar la deteccion y la cuantificacionde analitos en muestras de fluidos. Los dispositivos analíticos conocidos emplean movimientos de fluidos en una direccion unica. Debido aque no se crea unain terfaz de reaccion por el movimiento de dos fluidos en direcciones contrarias, los dispositivos conocidos no pueden emplearse para medir la intensidad dereaccion o la velocidad de reaccion en una interfaz de reaccion,tal como serevela a continuacion . Se revela un sistema analítico descartable de sustanciasquímica en polvo que es de amplia utilidad para la deteccion de una variedad de analitos presentes en los fluidos biologicos, tales como la sangre completa,suero,plasma, orina y fluido cerebr o-espinal. La presente revela el uso de la interfaz de reaccion que se forma entre los dos líquidos que convergen desdedirecciones opuestas dentro del material absorbente. El descubrimiento representa una marcada mejorarespecto de los sistemas react ivos analíticos ydescartables del arte previo en el sentido en que la zona reactiva detectable es visualmente diferente -y se encuentra separada- de los reactivos no