Study of Cholesterol—Sitosterol Crystallization Mixtures by DTA | Zendy

Karpuj Liliana | Zendy; Garti Nissim | Zendy; Sarig Sara | Zendy

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Study of Cholesterol—Sitosterol Crystallization Mixtures by DTA

Author(s) -

Karpuj Liliana,

Garti Nissim,

Sarig Sara

Publication year - 1982

Publication title -

israel journal of chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.908

H-Index - 54

eISSN - 1869-5868

pISSN - 0021-2148

DOI - 10.1002/ijch.198200051

Subject(s) - inflection point , chemistry , enthalpy , crystallization , solubility , melting point , thermodynamics , differential thermal analysis , diffraction , crystallography , organic chemistry , physics , geometry , mathematics , optics

DTA analysis was used to confirm evidence from X‐ray diffraction studies for the existence of 1:1 mixed sitosterol—cholesterol crystals. The curve of melting point against composition has an inflection point at about 1:1 ratio. The DTA peaks for 1:1 mechanical mixtures and for 1:1 mixed crystals are different with respect to symmetry and width. The curve of the heat of enthalpy against the composition of crystals also changes indicating a change in entropy. This can be attributed to the difference between melting mixed crystals (high order) and solid solution (low order). The solubility curve in the sitosterol—cholesterol—alcohol system has also a region of inflection confirming the previous conclusions.

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