Abstract:
In a microfluidic system (partially shown by element 178 in the figure and elements thereupon) using electrokinetic forces, the present invention uses electrical current or electrical parameters, other than voltage, to control the movement of fluids through the channels of the system. Time-multiplexed power supplies (200 and 202) also provide further control over fluid movement by varying the voltage on an electrode connected to a fluid reservoir of the microfluidic system, by varying the duty cycle during which the voltage is applied to the electrode, or by a combination of both. A time-multiplexed power supply can also be connected to more than one electrode for a saving in cost.
Abstract:
The present invention provides microfluidic devices and methods that are useful for performing high-throughput screening assays. In particular, the devices and methods of the invention are useful in screening large numbers of different compounds for their effects on a variety of chemical, and preferably, biochemical systems. The device includes a series of channels (110, 112), and optional reagent channel (114), fabricated into the surface of the substrate. At least one of these channels will typically have very small cross-sectional dimensions, e.g. in the range of from about 0.1 mu m to about 500 mu m. The device also includes reservoirs (104, 106 and 108), disposed and fluidly connected at the ends of the channels (110 and 114). As shown, sample channel (112) is used to introduce the plurality of different test compounds into the device. As such, this channel will generally be fluidly connected to a source of large numbers of separate test compounds that will be individually introduced into the sample channel (112) and subsequently into channel (110).
Abstract:
The present invention provides a microfluidic system (100) for fast, accurate and low cost electrophoretic analysis of materials in the fields of chemistry, biochemistry, biotechnology, molecular biology and numerous other fields. Light from periodically spaced regions along a channel (110) in the microfluidic system are received by the photodetector (130). The intensity of light received by the photodetector is modulated by the movement of species bands (123) through the channel under electrophoretic forces. By Fourier analysis, the velocity of each species band (123) is determined and the identification of the species is made by its electrophoretic mobility in the channel (110).
Abstract:
The present invention generally provides microfluidic devices (200) and systems that utilize electrokinetic material transport systems to selectively control and direct the transport of materials through and among complex arrangements of integrated microscale channels (for example, 202 and 208 + 2n, where n = 0, 1, ...8) disposed within integrated body structures.
Abstract:
An analytical or preparatory system comprises as a base unit (12), an adapter (14), and a substrate (16). The adapter (14) is attached to an attachment region on the base unit (12), and the substrate (16) is attached to an attachment region on the adapter (14). The adapter (14) permits the base unit (12) to be interfaced with a wide variety of different substrates (16) to perform chemical and biological analytical analyses and preparatory procedures.
Abstract:
A channel (140) is divised into portions (142, 144). The sidewalls of each channel portion (142, 144) have surface charges of opposite polarity. The two channel portions (142, 144) are physically connected together by a salt bridge (133), such as a glass frit or gel layer. The salt bridge (133) separates the fluids in channel (140) from an ionic fluid reservoir (135). To impart electroosmotic and electrophoretic forces along the channel (140) between parts A and B, respectively. Additionally, a third electrode (137) is placed in the reservoir (135).