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Titolo:
Polymorphic transformation of 1,3-distearoyl-sn-2-linoleoyl-glycerol
Autore:
Takeuchi, M; Ueno, S; Yano, J; Floter, E; Sato, K;
Indirizzi:
Hiroshima Univ, Fac Appl Biol Sci, Higashihiroshima 7398528, Japan Hiroshima Univ Higashihiroshima Japan 7398528 hihiroshima 7398528, Japan Unilever Res Vlaardingen, NL-3133 AT Vlaardingen, Netherlands Unilever ResVlaardingen Vlaardingen Netherlands NL-3133 AT Netherlands
Titolo Testata:
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
fascicolo: 12, volume: 77, anno: 2000,
pagine: 1243 - 1249
SICI:
0003-021X(200012)77:12<1243:PTO1>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOS; OILS; POS;
Keywords:
DSC; FTIR; linoleic acid; polymorphism; SLS (1,3-distearoyl-sn-2-linoleoyl-glycerol); synchrotron radiation X-ray diffraction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Takeuchi, M Hiroshima Univ, Fac Appl Biol Sci, Higashihiroshima 7398528, Japan Hiroshima Univ Higashihiroshima Japan 7398528 7398528, Japan
Citazione:
M. Takeuchi et al., "Polymorphic transformation of 1,3-distearoyl-sn-2-linoleoyl-glycerol", J AM OIL CH, 77(12), 2000, pp. 1243-1249

Abstract

Polymorphic transformation behavior of sub-alpha (1), sub-alpha (2), alpha, and gamma in 1,3-distearoyl-sn-2-linoleoyl-glycerol (SLS) has been studied with X-ray diffraction, differential scanning caloremetry, and Fourier-transform infrared spectroscopy. Synchrotron radiation X-ray beam was employed to observe rapid transformation processes from the sub-alpha and alpha forms to the gamma form. The chain length structures were double in sub-alpha(1), sub-alpha (2), and alpha, whereas gamma was of triple chain-length structure. The subcell packing was pseudohexagonal for the two sub-alpha forms, hexagonal for the a form, and parallel type for the gamma form. In comparison with 1,3-distearoyl-sn-2-oleoyl-glycerol (SOS), the occurrence behavior of sub-alpha, alpha, and gamma of SLS was the same as that of SOS. However, the absence of beta' and beta was unique for SLS. The chain-chain interactions between the linoleoyl moieties may stabilize the gamma form, prohibiting the transformation into beta' or beta forms. The presence of two cis double bonds may cause this stabilization, revealing the disordered chain conformation of the unsaturated chains.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 04:04:39