The percentage of the target compound relative to all peptide-related species in a sample, as measured by HPLC.
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Lyophilized Powder
The dry, freeze-dried form in which research peptides are typically shipped and stored. Far more stable than the same compound in solution.
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Mass Spectrometry
An analytical technique that confirms a molecule identity by measuring its exact mass-to-charge ratio.
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Endotoxin
A bacterial contaminant that quality processes aim to minimize. Low endotoxin levels are important for many research applications.
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