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Desalting and buffer exchange are two of the most common gel filtration chromatography applications, and they can be performed using the same resin. Desalting and buffer exchange both entail recovering the components of a sample in whatever buffer is used to pre-equilibrate the small, porous polymer beads (resin).
Diafiltration for Desalting or Buffer Exchange; Mobius Ultra/ Diafiltration Solutions This page was last ...
Dialysis is the process used to change the matrix of molecules in a sample by differentiating molecules by the classification of size. [6] [7] It relies on diffusion, which is the random, thermal movement of molecules in solution (Brownian motion) that leads to the net movement of molecules from an area of higher concentration to a lower concentration until equilibrium is reached.
Desalting and buffer exchange; Displacement chromatography; Distribution constant; Droplet countercurrent chromatography; Dye-ligand affinity chromatography; E.
Anion exchange resins have a positive charge and are used to retain and separate negatively charged compounds (anions), while cation exchange resins have a negative charge and are used to separate positively charged molecules (cations). Before the separation begins a buffer is pumped through the column to equilibrate the opposing charged ions.
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In LC-MS the desalting/concentration is realised with a pre-column, in off-line measurements reversed phase micro columns are used, which can be used directly with microliter pipettes. Here, the peptides are eluted with the spray solution containing an appropriate portion of organic solvent.