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Binary phase behavior of 1,3‐distearoyl‐2‐oleoyl‐ sn ‐glycerol (SOS) and 1,3‐distearoyl‐2‐linoleoyl‐ sn ‐glycerol (SLS)
Author(s) -
Takeuchi M.,
Ueno S.,
Flöter E.,
Sato K.
Publication year - 2002
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/s11746-002-0535-1
Subject(s) - glycerol , phase (matter) , metastability , crystallization , materials science , diffraction , transformation (genetics) , crystallography , analytical chemistry (journal) , chemical engineering , thermodynamics , chemistry , chromatography , organic chemistry , optics , physics , biochemistry , gene , engineering
The binary phase behavior of SOS (1,3‐distearoyl‐2‐oleoyl‐ sn ‐glycerol) and SLS (1,3‐distearoyl‐2‐linoleoyl‐ sn ‐glycerol) was examined by using DSC and conventional and synchrotron radiation X‐ray diffraction. The solid‐solution phases were observed in the metastable α and γ forms in all concentration ranges. Results indicated that the miscible γ form did not transform to the β′ form when the mixtures were subjected to simple cooling from a high‐temperature liquid to a low‐temperature solid phase. However, and α‐melt‐mediated transformation into β′ and β 2 resulted in the formation of immiscible phases in concentration ranges of SLS below 30%. By contrast, at SLS concentration ranges above 30%, the α‐melt‐mediated transformation caused crystallization of only the γ form, and β′ and β 2 crystals did not appear. These results show that the specific interactions between SOS and SLS are operative in the phase behavior of the mixture states of SOS and SLS.