Czech J. Food Sci., 2003, 21(5):185-191 | DOI: 10.17221/3497-CJFS
Crystals in hard candies
- 1 Department of Carbohydrate Chemistry and Technology and
- 2 Department of Glass and Ceramics, Institute of Chemical Technology, Prague, Czech Republic
- 3 Universidade de Aveiro, Departamento de Química, Portugal$2
The main purpose of the contribution presented here is the study of the glassy state and the presence of crystals in hard candies. Hard candies are non-chocolate sweets usually made of sucrose and glucose or of maltose syrup. They can also be made of alditols, used in sugar-free hard candies. In hard candies, carbohydrates or alditols are in amorphous state. Crystallisation in the glassy state of hard candies occurs as a result of a bad formulation, processing or storage and can be detrimental to the product quality. Differential scanning calorimetry was used to determine the glass transition temperature Tg and the amount of crystals. Polarising microscopy was used to show the undesirable presence of crystals in samples of hard candies. The carbohydrates composition of the samples was determined by HPLC and the moisture content in each sample was evaluated by Karl Fisher method.
Keywords: hard candy; the glass transition; crystallisation; differential scanning calorimetry; polarising microscopy
Published: October 31, 2003 Show citation
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