Title: Isothermal crystallization behaviour of lard at different temperatures studied by DSC and real-time XRD
Authors: Steen, Liselot ×
Rigolle, Annelien
Glorieux, Seline
Paelinck, Hubert
Fraeye, Ilse
Goderis, Bart
Foubert, Imogen #
Issue Date: 2015
Publisher: Published on behalf of the Canadian Institute of Food Science and Technology by Elsevier Applied Science
Series Title: Food Research International vol:69 pages:49-56
Abstract: Differential scanning calorimetry and real-time X-ray diffraction using synchrotron radiation were used to study the isothermal crystallization formation mechanism of lard at 18, 20, 22 and 24°C. At 18°C, lard crystallized in three steps. A potential mechanism for these three steps was proposed. In the first step, part of the melt (the trisaturated triacylglycerols (TAGs)) crystallized in α crystals adopting a double length structure (2L), while the second step consisted of a polymorphic transition of these 2Lα crystals to β’ crystals with a triple length structure (3L). Extra 3Lβ’ crystals consisting of monounsaturated TAGs were also formed directly from the melt. In the third and last step, β crystals were formed due to a second polymorphic transition of trisaturated 3Lβ’ crystals to β crystals adopting a 2L structure. Above a cut-off temperature of 20°C lard crystallized in two steps: no formation of α crystals could be observed and 3Lβ’ crystals (trisaturated and monounsaturated TAGs) were formed directly from the melt. This proposed mechanism implies that lard crystallization is characterized by an overlap of fractionated crystallization and polymorphic transitions.
ISSN: 0963-9969
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Bioengineering Technology TC, Technology Campuses Ghent and Aalst
Technologiecluster Bioengineering Technologie
Microbial and Molecular Systems, Campus Kulak Kortrijk
Polymer Chemistry and Materials
Microbial and Molecular Systems - miscellaneous
× corresponding author
# (joint) last author

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