Coated or inert HPLC columns are designed to minimize interactions between metal hardware and sensitive compounds. Coated columns are currently offered only for dual-ended columns and help reduce the chelating effect of column metal components on specific analytes such as nucleotides, oligonucleotides (oligos), and other phosphate group-containing molecules.

To achieve this, the entire internal metal surface of the column is treated with an inert protective coating. This protective layer prevents unwanted interactions between analytes and the column hardware, ensuring smoother analyte flow through the column and preserving sample integrity.

By minimizing metal interactions, coated columns improve chromatographic performance by reducing peak tailing, enhancing signal response, and increasing analytical reproducibility. In addition, the inert surface helps extend column lifetime by protecting both the analytes and the column hardware.

These coated columns are ideal for applications where high sensitivity and chemical integrity are critical, including nucleic acid analysis, biopharmaceutical research, and other workflows involving phosphate-containing biomolecules.