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Solvent crystallization of α, β and γ polymorphs of oleic acid
Author(s) -
Sato K.,
Suzuki M.
Publication year - 1986
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02679601
Subject(s) - crystallization , nucleation , decane , solvent , acetonitrile , oleic acid , polymorphism (computer science) , stearic acid , crystal habit , crystallography , solubility , chemistry , materials science , thermodynamics , organic chemistry , biochemistry , genotype , gene , physics
The features of the solvent crystallization of α, β and γ polymorphs of ultra‐pure oleic acid were examined in acetonitrile and decane. The solubilities of the three polymorphs were measured precisely, yielding a lower value for β than for the other two forms at any temperature. Thesolution‐ mediated transformation either from α to β or from γ to β was observed directly in the nearly saturated solution. It was found that this transformation occurred predominantly via the nucleation of the stable β form at the expense of the less stable ones. Finally the habit of the single crystal of each polymorph was determined for the first time. The results obtained were compared to the similar experiments of stearic acid polymorphs.