Physical Changes in Confectionery Products Caused by the Availability of Water, with a Special Focus on Lactitol Crystallization

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Crystallization of sugars produces signifi cant effects on the sensory and physical properties of food. Whereas crystallization of sucrose has received much attention, crystallization of polyols has not been well researched. Lactitol ([+] - 4 - O - â - D -galactopyranosyl - D - glucitol), a polyol, is being used increasingly as a sweetener in foods. This project studied the crystallization behavior of lactitol in order to better control the processing and quality of lactitol products. It was studied using two main approaches: (a) the melting enthalpy of the crystallizing lactitol samples and (b) their moisture sorption. The degree of crystallinity of lactitol during storage was determined by the melting enthalpy during storage. An iterative modeling equation was developed to describe the crystallization behavior of lactitol based on its moisture - sorption pattern. This model was based on the moisture adsorption of the amorphous lactitol, the moisture desorption of the crystalline lactitol, and the crystallizing lactitol, which was modeled using the Avrami equation. The rate of crystallization increased with increased temperature and relative humidity (RH). Lactitol crystallized down to 30% RH at 20 ° C and down to 22% RH at 32 ° C. The glass transition temperature of lactitol was successfully used to predict whether crystallization would occur at different storage temperatures and relative humidities.

Original languageEnglish
Title of host publicationWater Properties in Food, Health, Pharmaceutical and Biological Systems : ISOPOW 10
Number of pages12
Publication date14 May 2010
ISBN (Print)9780813812731
Publication statusPublished - 14 May 2010

    Research areas

  • Crystallization of sugars - significant effects on sensory and physical properties of food, Extent of crystallization - indicated by melting enthalpy of water, Lactitol - sweetener in foods, Lactitol crystallization - enhanced by water plasticization, mass transfer - movement of molecules, Physical changes in confectionery products - focus on lactitol crystallization, polyols - sugar alcohols or polyhydric alcohols

ID: 299416615