Coulter counter having a plurality of channels
The present invention generally relates to a method for rapidly counting micron and/or submicron particles by passing such particles through any of a plurality of orifices simultaneously with an ion current and measuring the signal generated thereby. The present invention also generally relates to a device for practicing the method of the present invention. Some embodiments can include methods and/or devices for distinguishing between and counting particles in mixtures. Still other embodiments can include methods and/or devices for identifying and/or counting bioparticles and/or bioactive particles such as pollen.
1. A multichannel particle counting device comprising:
a means for dividing a first reservoir and a second reservoir;
the means further comprising at least one orifice disposed between the first reservoir and the second reservoir through which the first and second reservoirs maintain fluid communication;
the at least one orifice further including a control electrode, wherein each control electrode is substantially electrically isolated from any other control electrodes;
each control electrode connected to a single circuit that superpositions all control electrode signals;
the first reservoir including a first electrode, which electrode is in electrical communication with a power supply;
the second reservoir including a second electrode, which electrode is in electrical communication with a measuring circuit;
the reservoirs containing an electrolyte solution; and
a means for creating a net fluid flow of electrolyte from one reservoir to the other reservoir.
2. The multichannel particle counting device of claim 1 , wherein the means for dividing the first and second reservoirs comprises a membrane.
3. The device of claim 2 , wherein the membrane comprises one or more materials selected from organic polymers, silicon, p-type silicon, and GaAs.
4. The device of claim 3 , wherein organic polymers include polymethyl methacrylates, polycarbonates, polyimides, polyphenols, and chlorinated polyolefins.
5. The device of claim 2 , wherein the control electrode controls the flow of particles through an associated orifice.
6. The device of claim 2 , wherein the control electrode comprises a material selected from one or more of AgIAgCl, platinum, and graphite.
7. The device of claim 2 , wherein the first and second electrodes are selected from AgIAgCl, platinum, and graphite.
8. The device of claim 2 , further comprising a means for collecting electrical current pulse data from the plurality of orifices.
9. The device of claim 8 , further comprising a means for processing the data collected.
10. A method for rapidly counting particles comprising the steps of:
charging one reservoir of the device of claim 1 with at least one particle to be measured;
applying a voltage across the first and second electrodes;
allowing the particles to migrate from one reservoir to the other through the plurality of orifices;
detecting the signals generated by particles passing through the plurality of orifices using a single detection circuit;
deconvoluting the signals detected;
correlating the signals to a number of particles for each individual channel; and
counting the deconvoluted signals.
11. The method of claim 10 , wherein the particle to be measured is selected from one or more of pollen, dust, airborne contaminants, microbes, viruses, and biological warfare agents.
12. The method of claim 11 wherein biological warfare agents comprise one or more of Anthrax, Botulinum Toxin, Brucellosis, Cholera, Clostridium Perfringens Toxin, Crimean-Congo Hemorrhagic Fever, Ebola Hemorrhagic Fever, Melioidosis, Plague, Q Fever, Ricin, Rift Valley Fever, Saxitoxin, Smallpox, Staphylococcal Enterotoxin B, Trichthecene Mycotoxin, Tularemia, and Venezuelan Equine Encephalitis.
13. The method of claim 10 , wherein the applied voltage is between 1 and 4 volts.
14. The method of claim 10 , wherein the signals comprise current and/or voltage pulses.
15. The method of claim 10 , wherein the step of deconvoluting further comprises applying the Hadamard transformation or Fast Fourier Transformation to the signal data.
16. The device of claim 2 , wherein the plurality of orifices comprises between 2 and 106 orifices.
17. The multichannel particle counting device of claim 1 , wherein the means for dividing the first and second reservoirs further comprises microfluidic channels.
18. The multichannel particle counting device of claim 17 , wherein the microfluidic channel is formed according to a method selected from one or more of lithography and micromachining.
19. The multichannel particle counting device of claim 1 , wherein the control electrode controls the flow of particles through an associated orifice.
20. The multichannel particle counting device of claim 1 , wherein the first and second electrodes are selected from AgIAgCl, platinum, and graphite.