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Titolo:
CRYSTALLIZATION KINETICS OF THE PURE TRIACYLGLYCEROLS GLYCEROL-1,3-DIPALMITATE-2-OLEATE, GLYCEROL-1-PALMITATE-2-OLEATE-3-STEARATE, AND GLYCEROL-1,3-DISTEARATE-2-OLEATE
Autore:
ROUSSET P; RAPPAZ M;
Indirizzi:
ECOLE POLYTECH FED LAUSANNE,MET PHYS LAB,MX-G CH-1015 LAUSANNE SWITZERLAND
Titolo Testata:
Journal of the American Oil Chemists' Society
fascicolo: 8, volume: 73, anno: 1996,
pagine: 1051 - 1057
SICI:
0003-021X(1996)73:8<1051:CKOTPT>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMORPHIC TRANSFORMATION; MELT CRYSTALLIZATION; COCOA BUTTER; SOLIDIFICATION; POP; SOS;
Keywords:
CRYSTALLIZATION KINETICS; DIFFERENTIAL SCANNING CALORIMETRY; MODELING; POLARIZED LIGHT MICROSCOPY; POP; POS; SOLIDIFICATION; SOS; TRIACYLGLYCEROL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
P. Rousset e M. Rappaz, "CRYSTALLIZATION KINETICS OF THE PURE TRIACYLGLYCEROLS GLYCEROL-1,3-DIPALMITATE-2-OLEATE, GLYCEROL-1-PALMITATE-2-OLEATE-3-STEARATE, AND GLYCEROL-1,3-DISTEARATE-2-OLEATE", Journal of the American Oil Chemists' Society, 73(8), 1996, pp. 1051-1057

Abstract

Crystallization kinetics of the three main components of cocoa butter, the triacylglycerols POP, POS, and SOS (where P, O, and S stand for palmitic, oleic, and stearic acids, respectively) were studied by combined differential scanning calorimetry and polarized light microscopy. The morphologies, nucleation kinetics, growth kinetics, and phases ofthe grains formed were identified with this system. The experimental data, as well as two different models to simulate crystallization and to predict behavior of the pure triacylglycerols, are presented. The first model is based on a macroscopical approach to solidification by using time-temperature-transformation (TTT) diagrams and the additivityprinciple. It allows prediction of the proportion of the different phases formed for any given thermal path imposed on the sample once the TTT diagram is known for the product. It is illustrated for SOS at constant cooling rates and is compared with experimental results. The second model directly simulates growth of the spherulites in the sample by using nucleation and growth rates that are determined experimentally. II provides a view of the structure as it would be observed with a microscope and shows evolution of the heat released in the sample. Isothermal solidification of POP at 15 degrees C is displayed. The experiment and the model are in good agreement.

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Documento generato il 07/07/20 alle ore 10:39:52