Precipitation of charged amino acids in the presence of oppositely charged polyelectrolytes leads to liquid droplets of the corresponding polymer/amino acid complexes in water. The resulting emulsions are stable against crystallization and Ostwald ripening for several months but can also be used as a starting situation for crystallization of spherical, porous crystal superstructures (see SEM image of L-lysine).
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Wohlrab et al. (2005) studied this question.
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