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Titolo:
Polymorphic transformations in sn-1,3-distearoyl-2-ricinoleyl-glycerol
Autore:
Bonbekri, K; Yano, J; Ueno, S; Sato, K;
Indirizzi:
Hiroshima Univ, Venture Business Lab, Higashihiroshima 7398527, Japan Hiroshima Univ Higashihiroshima Japan 7398527 hihiroshima 7398527, Japan Hiroshima Univ, Fac Appl Biol Sci, Higashihiroshima 7398528, Japan Hiroshima Univ Higashihiroshima Japan 7398528 hihiroshima 7398528, Japan
Titolo Testata:
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
fascicolo: 8, volume: 76, anno: 1999,
pagine: 949 - 955
SICI:
0003-021X(199908)76:8<949:PTIS>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRIACYLGLYCEROL POLYMORPHS; MONOACID TRIGLYCERIDES; STRUCTURAL-ANALYSES; IR TECHNIQUES; FT-IR; SOS; CRYSTALLIZATION; TRIPALMITIN; ACID; POS;
Keywords:
sn-1,3-distearoyl-2-ricinoleyl-glycerol; DSC; FTIR; hydroxylated triacylglycerols; polymorphic transformations; synchrotron radiation X-ray diffraction; X-ray diffraction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Bonbekri, K Hiroshima Univ, Venture Business Lab, 2-313 Kagamiyama, Higashihiroshima 7398527, Japan Hiroshima Univ 2-313 Kagamiyama HigashihiroshimaJapan 7398527
Citazione:
K. Bonbekri et al., "Polymorphic transformations in sn-1,3-distearoyl-2-ricinoleyl-glycerol", J AM OIL CH, 76(8), 1999, pp. 949-955

Abstract

Polymorphic transformations of sn-1,3-distearoyl-2-ricinoteyl-glycerol (SRS) have been studied with differential scanning calorimetry, X-ray powder diffraction (XRD), synchrotron radiation X-ray diffraction, and Fourier transform infrared spectroscopy (FTIR) techniques by using a 99.8% pure sample. Four polymorphs, alpha, gamma, beta'(2), and beta'(1), Were isolated. The thermal behavior of the four forms showed that the fusion of alpha at 25.8 degrees C was followed by the crystallization of gamma which melts at 40.6 degrees C, and beta'(2) and beta'(1) revealed melting peaks at 44.3 and 48.0 degrees C, respectively. No beta form was observed, even when the two beta' forms were annealed around their melting points over one week. The XRD long spacing indicates that alpha packs into a double chain-length structure; however, gamma and the two beta' phases pack into a triple chain-length structure. The polarized and nonpolarized FTIR spectra in methylene scissoring and methylene rocking regions indicated a parallel subcell packing in gamma, and a mixture of orthorhombic perpendicular and parallel or hexagonal subcells in the beta'(2) and beta'(1) phases. Consequently, SRS exhibits quite a unique polymorphic behavior, compared to tristearoyl glycerol and sn-1,3-distearoyl-2-oleoyl-glycerol.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 10:02:55