A method for separating amino and/or organic acid-containing particles from a mixture of amino and/or organic acid-containing particles based on density is disclosed, the method comprising: providing a feed of the amino and/or organic acid-containing particles providing a medium having a selected density effective for particles of a lower density than the selected density to float in the medium for particles of a higher density than the selected density to sink in the medium combining the feed of the amino and/or organic acid-containing particles with the medium and separating the amino and/or organic acid-containing particles of the higher density from the amino and/or organic acid-containing particles of the lower density.
