Ion chromatography for peptide counterions
Understand how ion chromatography measures anions in peptide preparations, how solution results become material fractions and what counterion tests do not establish.
Read the article →Research Hub
Explore peptide science, analytical testing and the documentation behind research materials.
500 articles to explore
Residual solvent testing by gas chromatography
Understand headspace GC solvent measurements, matrix-dependent partitioning and the calculation from a selective result to a material concentration.
Read the article →Elemental impurity analysis by ICP-MS
Understand trace-element signals, interference controls and the conversion from a prepared solution to the original material.
Read the article →Copper quantification in copper-peptide materials
Separate total elemental copper from copper assigned to a peptide complex, and understand why sample treatment matters.
Read the article →Benzyl alcohol assays in laboratory water
Understand selective preservative-content measurements, concentration units and the difference between chemical content and microbiological evidence.
Read the article →Measuring pH in low-buffer-capacity samples
Understand why weakly buffered samples can give drifting pH readings, and which measurement details make the result interpretable.
Read the article →Conductivity testing of laboratory water
Read conductivity and resistivity as indicators of ionic content, with the temperature and sample condition kept visible.
Read the article →Total organic carbon testing of laboratory water
Understand what TOC combines, how inorganic carbon is separated, and why a carbon result cannot identify individual organic compounds.
Read the article →What a sterility test can and cannot establish
Understand growth-based sterility testing, method suitability and the limits of a no-growth result.
Read the article →Bacterial endotoxin testing explained
Understand the endotoxin target, activity units and why this measurement differs from sterility or a general pyrogen assessment.
Read the article →LAL assay formats in endotoxin testing
Compare gel-clot, turbidimetric and chromogenic results, and distinguish an endpoint measurement from a kinetic readout.
Read the article →Recombinant factor C endotoxin assays
Understand the recombinant detection step, fluorescence readout and the evidence needed for use in a particular sample.
Read the article →