I agree with Phillip i also grow crystals in mixed solvent system.
My compounds mostly crystallizes in a mixed solvent system of solvents in which my compound is partially and completely soluble. first i make a suspension of compound to be crystallized in a sparangly soluble solvent to which i add next solvent (in which compound is completely soluble) till the suspension becomes clear solution then allow slow room temperature evaporation for few days/ week and get the first crystal. crystals aggregrate to make a flake or lumph on aging so keep a check.
For sugar (derivatives) that have abundant free (unprotected) alcohol functionalities EtOH can be used. In the event that your material is too soluble in EtOH and anti-solvent can be used. Water is ideal if your material has limited solubility in it, otherwise you will have to pick an organic anti-solvent, e.g. chloroform, EtOAc, petrol etc. Alternatively, if your material still have a free carboxylic acid moiety you can try converting it to a salt (either ion-exchange to sodium or treat with base), that should improve its crystallinity.
I agree with Phillip i also grow crystals in mixed solvent system.
My compounds mostly crystallizes in a mixed solvent system of solvents in which my compound is partially and completely soluble. first i make a suspension of compound to be crystallized in a sparangly soluble solvent to which i add next solvent (in which compound is completely soluble) till the suspension becomes clear solution then allow slow room temperature evaporation for few days/ week and get the first crystal. crystals aggregrate to make a flake or lumph on aging so keep a check.
You could try CH3OH:H2O slow evaporation, r.t. Please pay attention to papers:
1. B.Ivanova, M. Spiteller, Macromolecular ensembles of cyclodextrin crystallohydrates and clathrates – experimental and theoretical gas – and condense phase study, Int. J. Biological Macromolecules, 2013, http://dx.doi.org/10.1016/j.ijbiomac.2013.12.026