Yao Lin 
Why do some peptide sequences resist routine solid-phase synthesis? Learn how aggregation, hydrophobicity, local sterics, side reactions, length, and modifications affect feasibility.
A laboratory procurement comparison centered on lot-specific documentation, analytical scope, traceability, and the limits of routine HPLC and mass spectrometry.
System suitability determines whether an HPLC system and method are performing adequately at the time of a peptide analysis. Learn what repeatability, resolution, peak shape, and theoretical plates demonstrate—and what they cannot prove.
Peptide photostability depends on sequence, formulation, oxygen, light spectrum, exposure, and packaging. Learn what light-stress studies can—and cannot—establish.
A high HPLC purity result can coexist with lower peptide content because chromatographic purity, target-peptide mass, and total material mass are different measurements.
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.
