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CIMac PrimaS is a new member of BIA’s family of high performance monoliths for analysis and purification of mRNA. Its positive charge gives it some anion exchange behavior but hydrogen bonding makes its selectivity is entirely distinct from traditional anion exchangers. QA and DEAE anion exchangers need to be heated into the range of 50–70°C for large mRNA to elute. PrimaS elutes mRNA in a pH gradient, well separated from DNA and dsRNA. New experimental data show that NaCl shifts the elution profile to lower pH values.
