Synthetic peptides are often isolated as salts containing TFA, acetate, chloride, or another counterion. This guide explains why salt form matters, why weighed material is not necessarily peptide-only mass, and which lot-specific measurements clarify composition.
Peptide solubility reflects a system-specific balance among hydration, ionization, self-association and solid-state interactions. This guide explains why sequence, pH, concentration, salts, solvents and temperature must be considered together.
TLDR A peptide can be chemically simple and biologically complicated at the same time. At its most basic level, a peptide is a chain of amino acids joined together by peptide bonds. But the order of those amino acids can determine how the molecule folds, what it binds to, how quickly enzymes degrade it, whether … Read more
TLDR Peptides and proteins are made from the same basic molecular ingredients. Both consist of amino acid residues connected through peptide bonds. Both can fold. Both can bind biological targets. Both can act as signaling molecules. And both can have highly specific biological functions. So why do scientists use two different words? The simplest answer … Read more
TLDR A peptide certificate of analysis might report two reassuring-looking results: Purity: 99.4% by HPLC Mass: consistent with expected molecular weight Those results describe different things. One asks how clean the sample appears under a particular chromatographic method. The other provides evidence about what molecule is present. Understanding peptide identity vs. purity is important because … Read more
