Changes of polymorphism of lipid fractions of shortcrust pastries during storage: Studies with the use of thermal analysis (DSC)

• Published in: Journal of thermal analysis and calorimetry 2013-07, Vol.113 (1), p.301-310
• Main Authors: Miśkiewicz, Karolina, Nebesny, Ewa, Rosicka-Kaczmarek, Justyna
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Biological and medical sciences; Calorimetry; Cereal and baking product industries; Chemistry; Chemistry and Materials Science; Crystals; Food industries; Fundamental and applied biological sciences. Psychology; Hydrolysis; Inorganic Chemistry; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; Structure
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-013-3154-8

Differential scanning calorimetry (DSC) method allows to observe changes in polymorphism of fats, expressed as melting temperature and melting enthalpy of individual forms, created as a result of changes occurring in the structure of crystal lattice of a given lipid fraction. Degree of oxidation and hydrolysis of fat also influence the changes taking place in its polymorphism. The aim of this study was to establish the influence of kind of fat used for baking shortcrust pastries on selected properties of lipid fraction extracted from final product directly after baking and after storage. Changes of polymorphism in raw fats and fats extracted from shortcrust cookies were analyzed with the use of DSC. DSC analysis of raw fats revealed that the least amount of polymorphic forms had Akobake MP fat, the highest amounts of which can be found in Akobake BC fat and “Kasia” margarine (both three forms). The biggest changes in crystal lattice after baking process, compared to raw fat, took place in lipid fractions obtained from pasties obtained with the use of Akobake MP fat. In case of Akobake BC fat, in raw fat, the dominance of a form (59 J g −1 ) with a melting point around 3.5 °C and much smaller amounts of forms with melting temperatures of 25 and 35 °C, that is 3.2 and 7.5 J g −1 , respectively, were observed. During storage, further lowering of melting temperature of a polymorphic form with the lowest value of maximal temperature of melting process (peak I) was noticed. This phenomena indicates that further changes take place in lipid fractions during storage of the final product.