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Mass-directed purification, whether with a preparative HPLC or a bench-top flash system, is quickly gaining interest in the peptide purification space. The simple fact is that using a specific mass, r...
Resins for solid phase peptide synthesis can vary significantly in both functionalization and composition, leading to mixed results at the end of a synthesis. Previously, I demonstrated how the resin ...
It used to be easy with only polystyrene based resin types, but nowadays there is a broad choice of types to choose from, including everything from the C-terminal functionality (Rink vs Wang) to the p...
There are several strategies employed when a peptide synthesis requires optimization. Typically, the first thing considered is whether or not to double couple specific amino acids within the sequence....
As a peptide chemist, I was trained to purify my peptides with reversed-phase HPLC, just as many a peptide chemist before me. Despite the hundreds of hours I’ve logged in front of an HPLC, injecting s...
There are several strategies often employed to improve peptide purity achieved using reversed phase HPLC. These strategies can include, changing column length, particle size, particle functionality (C...
One common technique in HPLC for improving difficult peptide separations is to extend the column length, a topic I explored for flash chromatography in a previous post. However, alternative purificati...
Peptides, while exhibiting potential for unique specificity and affinity, still suffer from stability issues when introduced to a biological system. One strategy to overcome these stability issues is ...
Peptides, by nature, are composed of amino acids with potentially ionizable chemical moieties. The ionization state of any of these moieties can significantly impact the peptide’s chromatographic beha...
As the complexity of peptides continues to grow, so does the use of amino acids with side chain protecting groups that can be selectively removed, leaving the peptide on resin and the remaining side c...