Peptide Reconstitution Mistakes: Common Errors and How to Avoid Them
Reconstitution is deceptively simple. Small mistakes here can ruin an otherwise pristine peptide before a single experiment begins.
Reconstitution looks like the easiest step in handling a research peptide — add solvent, swirl, store. In practice, it is the step where the most preventable damage occurs.
Choosing the wrong solvent
Bacteriostatic water is the default for many peptides, but hydrophobic sequences require a small percentage of acetic acid or DMSO to fully solubilize. Forcing a stubborn peptide into plain water often produces a cloudy suspension that is not actually in solution.
Vortexing and shear stress
Aggressive vortexing can fragment delicate peptides and introduce foaming, which traps peptide at the air-liquid interface. Gentle inversion or slow swirling is almost always sufficient.
Direct stream onto powder
Spraying solvent directly onto the lyophilized cake can denature surface molecules. Run the solvent down the side of the vial and let capillary action do the work.
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