Crystallization from microemulsions - a novel method for the preparation of new crystal forms of aspartame

Helga Füredi-Milhofer, N. Garti, A. Kamyshny

Research output: Contribution to journalConference articlepeer-review

28 Scopus citations


Solubilization and crystallization of the artificial sweetener aspartame (APM), in water/isooctane microemulsions stabilized with sodium diisooctyl sulfosuccinate (AOT) has been investigated. The amount of aspartame that could be solubilized depended primarily on the amount of surfactant and on the temperature. The maximum AOT/aspartame molar ratio at the w/o interface is shown to be 6.2 at 25°C. It was concluded that the dipeptide is located at the w/o interface interspersed between surfactant molecules and that it acts as a cosurfactant. A new crystal form, APM III, was obtained by cooling of hot w/isooctane/AOT microemulsions containing solubilized aspartame. The new crystal form exhibits a distinct X-ray diffraction powder pattern, as well as changes in the FTIR spectra, thermogravimetric and DSC patterns. H-NMR spectra of APM III dissolved in D2O were identical to the spectrum of commercial aspartame recorded under the same conditions. The new crystal form has greatly improved dissolution kinetics.

Original languageAmerican English
Pages (from-to)1365-1370
Number of pages6
JournalJournal of Crystal Growth
Issue numberpt 2
StatePublished - Mar 1999
EventProceedings of the 1998 10th International Conference on Vapor Growth and Epitaxy and Specialist Workshops on Crystal Growth, ICVGE-10 - Jerusalem, Isr
Duration: 26 Jul 199831 Jul 1998


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