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Aimed at exploring new solvents for the crystallization of l-tryptophan, the solubility and metastable zone of l-tryptophan in binary solvents of methanol–water, ethanol–water and 1-propanol–water were measured using a laser method. It is demonstrated that the dielectric constant of the solvent significantly affects the solubility of l-tryptophan. Furthermore, results indicate that 1-propanol–water...
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