Liquid chromatographic method and system
First Claim
1. A pumping system comprising:
- at least one pump having a cylinder, a piston and a pump head with an outlet;
at least one inlet tube having first and second ends communicating with the cylinder at one end and adapted to communicate with at least two sources of fluid at the other end;
said at least one inlet tube having a diameter and length shaped for flow; and
drive means for driving said piston with sufficient speed to cause turbulent mixing in said cylinder, wherein fluid from said at least two sources of fluid are mixed before being pumped from said outlet;
an over-pressure system for compensating for pressures in the fluid above a preset pressure.
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Accused Products
Abstract
To economically perform preparatory chromatography, a plurality of pumps each having a corresponding one of a plurality of pistons and a corresponding one of a plurality of cylinders are driven by one motor to draw and pump solvent simultaneously into corresponding columns. To form a gradient, the pumps are connected to two-way valves that are connected alternately to a first solvent and a second solvent, whereby the time said valve is in a first position controls the amount of solvent drawn from the first reservoir into said pumps and the amount of time in said second position controls the amount of said second solvent drawn from the second reservoir into said pumps and the solvent is mixed in the pumping systems. The detectors are photodiodes mounted to light guides in the flow cells that generate signals related to light absorbance and communicate with a controller, whereby the controller receives signals indicating solute between the light guides and causes collection of solute. An over-pressure system compensates for pressure over a predetermined level.
51 Citations
23 Claims
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1. A pumping system comprising:
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at least one pump having a cylinder, a piston and a pump head with an outlet;
at least one inlet tube having first and second ends communicating with the cylinder at one end and adapted to communicate with at least two sources of fluid at the other end;
said at least one inlet tube having a diameter and length shaped for flow; and
drive means for driving said piston with sufficient speed to cause turbulent mixing in said cylinder, wherein fluid from said at least two sources of fluid are mixed before being pumped from said outlet;
an over-pressure system for compensating for pressures in the fluid above a preset pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification