Methods, devices and systems for characterizing proteins
First Claim
1. A method of performing an analytical operation on a fluid first sample material, comprising:
- providing a microfluidic device that has a body having at least a first and a second channel disposed therein, the first channel comprising first and second channel segments, the first channel segment comprising a first fluid environment compatible with the performance of a first separation operation, the second channel segment comprising a detection zone for detecting the analytical operation wherein the second channel intersects the first channel at a first location substantially downstream along the first channel segment and immediately upsteam of the detection zone;
flowing the first sample material through the first channel segment to perform the first separation operation;
flowing the first sample material from the first channel segment into the second channel segment; and
introducing a first diluent consisting essentially of buffer into the first channel at the first location from the second channel, the diluent producing a second fluid environment within the second channel segment of the first channel, the second environment being more compatible than the first environment for detecting a result of the separation operation.
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Abstract
A method of characterizing a polypeptide, comprising providing a first capillary channel having a separation buffer disposed within, wherein the separation buffer comprises a non-crosslinked polymer solution, a buffering agent, a detergent, and a lipophilic dye. The separation buffer is provided such that, at the time of detection, the detergent concentration in the buffer is not above the critical micelle concentration. The polypeptide is introduced into one end of the capillary channel. An electric field is applied across a length of the capillary channel, which transports polypeptides of different sizes through the polymer solution at different rates. The polypeptide is then detected as it passes a point along the length of the capillary channel.
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Citations
32 Claims
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1. A method of performing an analytical operation on a fluid first sample material, comprising:
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providing a microfluidic device that has a body having at least a first and a second channel disposed therein, the first channel comprising first and second channel segments, the first channel segment comprising a first fluid environment compatible with the performance of a first separation operation, the second channel segment comprising a detection zone for detecting the analytical operation wherein the second channel intersects the first channel at a first location substantially downstream along the first channel segment and immediately upsteam of the detection zone;
flowing the first sample material through the first channel segment to perform the first separation operation;
flowing the first sample material from the first channel segment into the second channel segment; and
introducing a first diluent consisting essentially of buffer into the first channel at the first location from the second channel, the diluent producing a second fluid environment within the second channel segment of the first channel, the second environment being more compatible than the first environment for detecting a result of the separation operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A device for separating polypeptides, comprising:
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a body structure having at least a first capillary channel disposed therein;
a separation buffer disposed in the first capillary channel, the separation buffer comprising;
a non-crosslinked polymer solution;
a buffering agent;
a first detergent; and
a lipophilic dye capable of binding to the polypeptide or polypeptides; and
a first port disposed in the body structure in fluid communication with the first capillary channel, for introducing polypeptides into the first capillary channel. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification