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Titolo:
ALPHA-MELT-MEDIATED CRYSTALLIZATION OF 1-PALMITOYL-2-OLEOYL-3-STEAROYL-SN-GLYCEROL
Autore:
ROUSSET P; RAPPAZ M;
Indirizzi:
ECOLE POLYTECH FED LAUSANNE,DEPT MAT,MX-G CH-1015 LAUSANNE SWITZERLAND
Titolo Testata:
Journal of the American Oil Chemists' Society
fascicolo: 6, volume: 74, anno: 1997,
pagine: 693 - 697
SICI:
0003-021X(1997)74:6<693:ACO1>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMORPHISM; KINETICS; POS;
Keywords:
COCOA BUTTER; CRYSTALLIZATION; DSC; KINETICS; POLARIZED-LIGHT MICROSCOPY; POLYMORPHISM; POS; SOLIDIFICATION; SPHERULITE; TRIACYLGLYCEROL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
P. Rousset e M. Rappaz, "ALPHA-MELT-MEDIATED CRYSTALLIZATION OF 1-PALMITOYL-2-OLEOYL-3-STEAROYL-SN-GLYCEROL", Journal of the American Oil Chemists' Society, 74(6), 1997, pp. 693-697

Abstract

The alpha-melt-mediated crystallization of 1-palmitoyl-2-oleoyl-3-stearoyl-sn-glycerol (POS) has been investigated by differential scanningcalorimetry (DSC), combined with polarized-light microscopy. Startingfrom a completely liquid state, the melt was first cooled down and maintained at a temperature, T-1, during a time, t(1), where the alpha-phase formed. Then it was heated to a temperature, T-2, above the melting point of alpha for isothermal solidification into a solid phase, which was identified as delta. Based upon DSC solidification peaks, the time-temperature-transformation (TTT) diagram of POS was constructed for these solidification conditions and was compared with the TTT diagram of direct crystallization from the melt. The alpha-melt-mediated solidification showed accelerated kinetics of the delta-phase. The effects of T-1 and t(1) were also studied: at short t(1), crystallization was faster with a decreasing value of T-1, whereas the opposite trend was observed for a longer plateau at T-1. These tendencies were interpreted in terms of three competing phenomena: the density of delta-nuclei that can form during the plateau at T-1, alpha-delta solid-state transformation, and memory effects of molecule arrangements in the alpha-remelted phase.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 21:17:44