of sucrose fatty acid esters to undergo intramolecular migrations in organic medium and the regioselectivity of some transesterifications of sucrose were investigated by HPLC, in situ NMR spectroscopy and preparative methods. Extensive acylation on secondary positions of the glucose moiety followed by migrations is general for base catalysed transesterification. The stability of 3‐ and 6‐O‐acyl derivatives
This disclosure provides for a novel lactose monolaurate (LML) with the structure
useful as an antimicrobial agent and as a potential substitute for other sugar esters. Methods of synthesizing LML using immobilize lipases and various solvents are also provided.
Shape Dependence in the Formation of Condensed Phases Exhibited by Disubstituted Sucrose Esters
作者:Valérie Molinier、Paul J. J. Kouwer、Juliette Fitremann、Alain Bouchu、Grahame Mackenzie、Yves Queneau、John W. Goodby
DOI:10.1002/chem.200600368
日期:2007.2.12
We report on the self-organizing properties of sucrose esters that are di-(1',6', 1',6, and 6,6')-substituted with aliphatic chains of identical or different chain lengths and levels of saturation. For the materials possessing two saturated aliphatic chains, the compounds exhibited thermotropic lamellar smectic A phases. A remarkable new phase transition was observed for the di-octadecanoyl homologue
Self-Organizing Properties of Monosubstituted Sucrose Fatty Acid Esters: The Effects of Chain Length and Unsaturation
作者:Valérie Molinier、Paul J. J. Kouwer、Juliette Fitremann、Alain Bouchu、Grahame Mackenzie、Yves Queneau、John W. Goodby
DOI:10.1002/chem.200500773
日期:2006.4.24
Three families of mono-substituted sucrosefattyacidesters were prepared by enzymatic and classical synthetic procedures, and their self-assembly and self-organizational properties were investigated by thermal polarised light microscopy, differential scanning calorimetry and X-ray diffraction. The properties were evaluated as a function of the fattyacidchainlength. For the lower homologues of the
Sucrosefattyacidesters were synthesized by the transesterification of sucrose with aliphatic esters under ultrasound irradiation in good yield (73%). The optimum reaction conditions for the transesterification reaction include a molar ratio of sucrose to fattyacid ethyl ester of 2:1 and the use of a 13%mol anhydrous K(2)CO(3) catalyst. The optimum reaction temperature was set at 70 degrees C, the