Chromatografische technieken

In this video, we demonstrate an anion-exchange chromatography technique to purify human calcium-binding protein S100A12 based on the net surface charge of the protein from an Escherichia coli culture.

In this video, we demonstrate the purification of calcium-binding protein from a dialyzed cell lysate through calcium-dependent hydrophobic interaction chromatography. The calcium-binding proteins expose a hydrophobic region upon binding with calcium, facilitating interaction with a hydrophobic group on resin. Later these proteins are eluted using calcium chelator EDTA that reverses the interaction.

In this video, we demonstrate the nickel affinity chromatography technique to purify histidine-tagged pyrophosphokinase enzymes from Clostridium difficile bacteria.

This video demonstrates the thin-layer chromatography-based separation of mycolic acids. This technique separates the different mycolic acids—long-chain lipids present in the cell wall of mycobacteria—based on their polarity.

In this video, we demonstrate the technique to isolate baculovirus from an insect cell supernatant using heparin affinity chromatography. The isolation is facilitated by the affinity between the heparin in the column to the baculovirus envelope glycoprotein.

This video demonstrates the cation exchange chromatography technique to isolate recombinant protein from the insect cell protein lysate.

This video demonstrates the principle of separation of hydrophilic polar compounds using hydrophilic interaction liquid chromatography. This technique helps in the purification of various polar analytes, including N-glycans.

In this video, we demonstrate a technique–size exclusion chromatography–to separate a heterogenous population of outer membrane vesicles or OMVs derived from bacteria. These vesicles are nanosized spherical structures and are separated into large and small subpopulations based on their size through Size Exclusion Chromatography.

This video demonstrates the hydrophobic interaction liquid chromatography-based characterization of antibody-drug conjugates. Using a butyl ligand-based chromatography column, the antibody-drug conjugates are characterized via hydrophobic interactions with the ligand.

In this video, we demonstrate the detection of sialic acids, N-acetylneuraminic acid and N-glycolylneuraminic acid, using high-performance liquid chromatography, HPLC, following derivatization with a suitable fluorescent labeling reagent to aid in fluorescence detection.

In this video, we demonstrate a fluorescence-detection size-exclusion chromatography technique to screen for green fluorescent protein (GFP)-fused membrane protein stability in Escherichia coli following detergent solubilization. Proteins exhibiting a symmetrical peak in the size-exclusion profile with little or no free GFP indicate purified proteins with minimum degradation and aggregation, which can subsequently be selected for structure-function analysis.

This video describes an affinity chromatography technique for purifying 2F5 monoclonal antibodies using the DsRed-2F5-Epitope or DFE ligands. The purified 2F5 monoclonal antibodies are essential drugs in immunotherapy.

This video demonstrates a thin-layer chromatography-based enzyme assay to determine pyrophosphokinase activity using radiolabeled nucleotides. The method provides insights into nucleotide synthesis and phosphotransfer reactions.

This video demonstrates the use of headspace gas chromatography to determine the ethanol concentrations in zebrafish embryos. This method provides a useful tool for qualitative and quantitative analysis of volatile organic compounds.

This video demonstrates a technique for the preliminary separation and quantification of lipids from human peripheral blood-derived neutrophils. This technique helps in the initial evaluation of target analytes before proceeding with HPLC.