Multi-point detection method for electrophoresis and chromatography in capillaries
First Claim
1. A method for obtaining a plurality of solute peak patterns representing successive stages of a continuous separation of solutes by a separation process selected from chromatographic and electrophoretic separations performed in a separation medium retained in a capillary, said method comprising detecting, with a single detector, variations in light absorptivity as a function of time at a plurality of locations spaced apart along the length of said capillary.
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Abstract
Multiple electropherograms or chromatograms representing successive stages of an electrophoretic or chromatographic separation in a capillary are obtained by training a recorder on a succession of detection windows in the capillary, spaced apart along the capillary length. A single immovable detector is used, and the capillary is either held such that each detection window is placed in alignment with the detector in succession, or is looped such that the detection windows all lie in the path of the detector at the same time.
57 Citations
20 Claims
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1. A method for obtaining a plurality of solute peak patterns representing successive stages of a continuous separation of solutes by a separation process selected from chromatographic and electrophoretic separations performed in a separation medium retained in a capillary, said method comprising detecting, with a single detector, variations in light absorptivity as a function of time at a plurality of locations spaced apart along the length of said capillary.
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2. A method for determining values representative of the mobilities and relative amounts of solutes undergoing electrophoretic separation through a separation medium in a capillary, said method comprising:
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(a) with a single detector, detecting variations in light absorptivity by said separation medium as a function of time at a plurality of detection points spaced apart along the length of said capillary; (b) at each said detection point, identifying peaks in the variations in light absorptivity thus detected, and a sequence in which said peaks occur which is substantially the same at all said detection points; (c) for each peak in said sequence, averaging among all said detection points the distance traveled by said peak to said detection point divided by the time taken by said peak to reach said detection point; and (d) for each peak in said sequence, averaging among all said detection points the areas defined by peaks at the same position in said sequence.
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3. A method for obtaining a plurality of solute peak patterns representing successive stages of a continuous separation of solutes by a separation process selected from the group consisting of chromatographic and electrophoretic separations performed in a separation medium retained in a capillary, as said solutes are migrating in a direction of migration in said capillary, said method comprising:
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(a) aligning a first location in said capillary with a light absorptivity detector, and obtaining a first solute peak pattern by detecting variations in light absorptivity by said separation medium as a function of time at said first location; (b) displacing said capillary relative to said detector to align therewith a second location further along the length of said capillary in said direction of migration, and obtaining a second solute peak pattern by detecting variations in light absorptivity as a function of time at said second location; and (c) repeating step (b) at a sufficient number of locations to achieve said plurality of solute peak patterns. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A method for obtaining a plurality of solute peak patterns representing successive stages of a continuous separation of solutes by a separation process selected from the group consisting of chromatographic and electrophoretic processes, said method comprising:
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(a) subjecting said solutes to conditions promoting said separation process in a separation medium retained in a capillary, said capillary being looped at least once to place a plurality of locations along the length of said capillary defined as detection points in sufficient proximity to each other that all such detection points intercept a single detection beam of a light absorption detector, each pair of detection points separated by at least one loop of said capillary; and (b) detecting variations in the absorption of light from said detection beam by said separation medium as a function of time, caused by the migration of said solutes through said separation medium past said detection points. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification