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  • Title: [On the polymorphism of barbiturates in powders and tablets. Part 1: Crystal optical studies on, and melting behaviour of barbital (author's transl)].
    Author: Hollenbach K, Pintye-Hódi K, Kedvessy G.
    Journal: Pharmazie; 1979; 34(3):164-7. PubMed ID: 450956.
    Abstract:
    Crystal optical studies showed that barbital brands that conform to the standards of the DAB 7--DDR and the Ph. Hung. VI, respectively, present two different crystalline forms. After recrystallization form water or acetone-water mixture (1:1), the optical crystal picture of the brand conforming to the DAB 7--DDR prevails. The melting points of the commercial products do not differ from each other; both substances melt at 187.5 degrees C, whereas the melting points of the recrystallized products are 1.5 degrees and 2 degrees C, respectively, lower.
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