Journal
CRYSTAL GROWTH & DESIGN
Volume 10, Issue 6, Pages 2668-2675Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg100152c
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The preferential enrichment phenomenon has been observed for two neutral a-amino acids, leucine and alanine, by applying kinetic crystallization conditions using high concentrations and appropriate solvents. The mechanism of preferential enrichment of leucine and alanine is proposed on the basis of (i) the difference in solubility between the racemic and enantiomerically pure samples, (ii) the observation of polymorphic transition during crystallization by in situ attenuated total reflection infrared spectroscopy, (iii) the characterization of deposited crystals by X-ray crystallographic analysis, and (iv) the optical microscopic or atomic force microscopy observation of the crystal shape or surface, respectively.
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