摘要:
A handheld apparatus for testing a sample of body fluid for redox active substances. An electronic identification tag comprising information on the type of disposable electrochemical test unit is embedded in the disposable electrochemical test unit.
摘要:
Device and methods for use in a biosensor comprising a multisite array of test sites, the device and methods being useful for modulating the binding interactions between a (biomolecular) probe or detection agent and an analyte of interest by modulating the p H or ionic gradient near the electrodes in such biosensor. An electrochemically active agent that is suitable for use in biological buffers for changing the p H of the biological buffers. Method for changing the pH of biological buffers using the electrochemically active agents. The methods of modulating the binding interactions provided in a biosensor, analytic methods for more accurately controlling and measuring the pH or ionic gradient near the electrodes in such biosensor, and analytic methods for more accurately measuring an analyte of interest in a biological sample.
摘要:
The invention relates to a method for producing a device for electrochemically detecting molecules by means of redox-cycling, and to a device therefore and use thereof. A porous dielectric layer, which can absorb redoxactive molecules, is arranged between two electrode layers and is eventually biofunctionalised. The individual layers are applied, preferably, by means of a ink jet printing method.
摘要:
Provided is a method for detecting a test substance. In this method, metal is deposited or a complex containing a test substance and a metal particle is immobilized on a working electrode on an electrode substrate including the working electrode and a counter electrode. An oxidation potential is applied to the working electrode to generate metal ions, then a reduction potential is applied to a portion having an area smaller than an area of the portion to which an oxidation potential is applied in the working electrode to deposit metal on the surface of the portion to which the reduction potential is applied, and current, voltage or charge caused by the metal deposited is measured to detect metal ions or a test substance.
摘要:
Devices for electrochemical measurement of a redox active substance secreted by a cell in a liquid sample are provided. The devices include one or more electrodes and a matrix capable of releasing a chemical agent that stimulates secretes of the redox active substance by the cell. In some embodiments, the devices include a nanofluidic electrode assembly in which the one or more electrodes are disposed within a nanofluidic channel. Methods of fabricating the devices and methods of using the devices to detect secretion of a redox active substance by a cell are also provided.
摘要:
The present invention relates to an electrochemical biosensor with improved hematocrit measurement accuracy for measuring blood glucose. According to the present invention, an electrochemical biosensor including a first electrode part for correcting a measured hematocrit value and a second electrode part for measuring a glucose concentration is effective in improving accuracy of a measured hematocrit value and in more improving accuracy of a measured blood glucose concentration using the measured hematocrit values for correction, because an insulation cover is made thinner than a working electrode and an auxiliary electrode, so that areas of a first working electrode and a first auxiliary electrode of the first electrode part exposed to a blood sample become equal; a distance between the first working electrode and the second working electrode becomes constant; and electrode areas are maintained constantly by the insulation cover even when a positioning error occurs during printing.
摘要:
We propose a procedure for the determination of lactic acid or lactate in biological fluids, which is simple and low cost with respect to the known methodologies. This procedure can be used by unskilled personnel and it can be implemented in disposable test strips and portable measure devices. The procedure is based on the photochemical reaction of lactic acid with Fe(III), which is reduced to Fe(II) when irradiated with UV light. The Fe(II), produced proportionally to the amount of lactate in the sample, is determined electrochemically or using its reaction with a colored complexing agent, such as 1,10-phenanthroline, and determined by spectrophotometry. This method is advantageous both for the low cost of the reagents employed, and for their short and long term stability.
摘要:
The invention relates to an electrode arrangement for the cyclic reduction and oxidation of a redox species in an electrolyte, wherein both electrodes are arranged on an insulating substrate and are connected to apply a voltage to a counter-electrode, comprising: a) a control electrode for reacting the redox species for a cyclic electron transport between the electrodes, and b) a collector electrode arranged opposite the control electrode, wherein a layer structure comprising a second insulator and a charge transfer mediator arranged thereon for reacting the redox species is additionally arranged on the side of the collector electrode opposite the insulating substrate. The invention relates to two methods for operating the electrode arrangement.
摘要:
Methods and systems for measuring the oxidation-reduction potential of a fluid sample are provided. The system includes a test strip with a sample chamber adapted to receive a fluid sample. The sample chamber can be associated with a filter membrane. The test strip also includes a reference cell. The oxidation-reduction potential of a fluid sample placed in the sample chamber can be read by a readout device interconnected to a test lead that is in electrical contact with the sample chamber, and a reference lead that is in electrical contact with the reference cell. Electrical contact between a fluid sample placed in the sample chamber and the reference cell can be established by a bridge. The bridge may comprise filter element such as a piece of filter paper that is wetted, for example by the fluid sample, or an electrolytic gel. The oxidation-reduction potential may be read as an electrical potential between the test lead and the reference lead of the test strip.