The present disclosure relates to the determination of analytes in a sample using chromatography. The present disclosure provides methods of separating an analyte from a sample. The method includes introducing a sample comprising the analytes into a chromatographic system. The chromatographic system has a flow path disposed in an interior of the chromatographic system, at least a portion of the flow path having an active coating, and a chromatographic column having a stationary phase material in an interior of the chromatographic column that facilitates separation of the analytes in the sample through interaction with at least one analyte in the sample. The active coating is selected to interact with at least one analyte in the sample through (1) a repulsive force, (2) a secondary interaction, or (3) a retention mechanism distinct from the interaction with the stationary phase material.

The present invention relates to a method for the determination of chromatography conditions for the separation of a biomolecule from a liquid sample, which method comprises selecting a number of experiments using design of experiments (DoE); performing said experiments with in-line conditioning of orthogonal quality measures; and based on the results from the experiments, determining efficient chromatography conditions for said biomolecule. The invention also relates to a system for performing the method as well as a computer program and an instrument comprising such a computer program.

A multi-dimensional chromatographic method for the separation of N-glycans. The method comprises providing a glycan preparation that includes at least one negatively charged N-glycan. The glycan preparation is then separated by anion-exchange chromatography and at least one secondary chromatographic technique.

A sample separation apparatus includes a first-dimension separation unit for separating the fluidic sample, having a first-dimension outlet for outputting the fluidic sample or fractions thereof, and a second-dimension separation unit for further separating the fluidic sample or fractions thereof. The second-dimension separation unit has a second-dimension inlet fluidically coupled to the first-dimension outlet. A modulation unit, coupled between the first-dimension outlet and the second-dimension inlet at a first coupling point, is configured for withdrawing fluid from the first coupling point and for ejecting fluid into the first coupling point. A second-dimension fluid drive is coupled to a second coupling point located between the first-dimension outlet and the second-dimension inlet and downstream from the first coupling point. The second-dimension fluid drive is configured for generating a fluid flow for driving at least part of the fluidic sample after treatment by the first-dimension separation unit through the second-dimension separation unit.

Described are an interface module for two-dimensional chromatography and a method of performing a chromatographic separation that may use the interface module. The interface module includes a valve module, a collection needle, a modifier module and a sample storage element. The valve module has a first port configured to receive an eluent from a first chromatography system, a second port configured to provide a fraction obtained from the eluent, a third port and a fourth port. The collection needle and the modifier module are in fluidic communication with the valve module at the third and fourth ports, respectively. The modifier module includes a source of a modifier solvent. The sample storage element is in fluidic communication with the valve module and is configured to receive a volume of the fraction for injection as a sample into a second chromatography system.

New metrics are disclosed for characterizing polyethylene copolymers which can be computed from the Cross-Fractionation Chromatography data of these polymers. These metrics are able to quantify the Broad Orthogonal Composition Distribution (BOCD) character of the polymers, and they can be used to discriminate polymers with an enhanced BOCD character from polymers that have the BOCD character to a lesser extent or from polymers that have the conventional molecular weight distribution and/or branching distribution.

A fluid processing device (10) for processing fluid, wherein the fluid processing device (10) comprises a first fluid drive unit (20) configured for driving a first fluid along a first flow path (85), a second fluid drive unit (20) configured for driving a second fluid along a second flow path (86), and a fluidic switch (90) fluidically coupled to the first flow path (85) and to the second flow path (86) and configured for being switchable for transferring first fluid from the first flow path (85) into the second flow path (86) without interruption of fluid flow along at least one of the first flow path (85) and the second flow path (86).

An analysis method according to the present invention includes: producing a plurality of kinds of polyhydric alcohol compounds by subjecting a copolymer of a conjugated diene compound with an aromatic vinyl compound to ozonolysis and reducing the ozonolysis product; separating a sample solution containing the plurality of kinds of polyhydric alcohol compounds with a liquid chromatograph; and introducing the separated sample into a mass spectrometer to analyze results of the detection. Specifically, the present invention relates to a method for analyzing a styrene-butadiene rubber (SBR) including: separating with a comprehensive two-dimensional liquid chromatograph a polyhydric alcohol compound obtained by subjecting a styrene-butadiene rubber of 1,3-butadiene as the conjugated diene compound and styrene as the aromatic vinyl compound to ozonolysis and reducing the ozonolysis product; and then analyzing the polyhydric alcohol compound by measuring with a mass spectrometer.

Provided are two-dimensional chromatography systems and methods for separating and/or analyzing complex mixtures of organic compounds. In particularly, a two-dimensional reversed-phase liquid chromatography (RPLC)supercritical fluid chromatography (SFC) system is described including a trapping column at the interface which collects the analytes eluted from the first dimension chromatography while letting the RPLC mobile phase pass through. The peaks of interest from the RPLC dimension column are effectively focused as sharp concentration pulses on the trapping column, which is subsequently injected onto the second dimension SFC column. The system can be used for simultaneous achiral and chiral analysis of pharmaceutical compounds. The first dimension RPLC separation provides the achiral purity result, and the second dimension SFC separation provides the chiral purity result (enantiomeric excess).

Various embodiments are generally directed to techniques for splitting fluid flows with porous medium, such as a porous medium with metal particles, for instance. Some embodiments are particularly directed to a flow splitting assembly that creates a differential flow at a calibrated flow split. In one or more embodiments, for example, an apparatus for flow spitting may include a manifold comprising first, second and third manifold openings in fluid communication. In one or more such embodiments, introduction of a flow to the first manifold opening via an inlet filter may cause a differential flow at a calibrated flow split between a first restrictor coupled to the second opening of the manifold and a second restrictor coupled to the third opening of the manifold. In various embodiments, each restrictor may include one or more porous medium composed of metal particles.