A method for high throughput micro-purification of a library of tag-free biological compounds is claimed wherein a population of discrete liquid samples comprising the library of tag-free biological compounds is contacted with a solid chromatographic material comprising a functional group selected from ion exchange materials, hydrophobic materials, affinity materials and hydrophobic charge induction materials so as to retain the tag-free biological compounds of the library, isolating the chromatographic material retaining the biological compounds, releasing the biological compounds of the library from the solid chromatographic material and collecting the released biological compounds of the library to produce a population of samples comprising the isolated biological compound.
