Thermotropic phase behaviour of long-chain alkylmaltosides

Summary, in English

The thermotropic phase behaviour and phase structure of crystalline and non-crystalline n-tetradecyl-beta-D-maltoside (C(14)G(2)) and n-hexadecyl-beta-D-maltoside (C(16)G(2)) have been investigated by means of differential scanning calorimetry and X-ray techniques. Upon lyophilisation, both compounds form a solid, lamellar phase comprising disordered head groups and hexagonally packed alkyl chains that are suggested to be tilted and interdigitated. This ordered lamellar phase melts into a metastable lamellar liquid crystal, which re-crystallises to a high-temperature crystalline polymorph comprising interdigitated, non-tilted alkyl chains. Remarkably, the high-temperature polymorph of C(14)G(2) has the same melting point as that of C(16)G(2), namely 105 degrees C for both surfactants. A low-temperature polymorph of anhydrous C(14)G(2) crystallises from water at room temperature, whereas the hemihydrate of C(14)G(2) crystallises at 6 degrees C from water, or from chloroform containing trace water. X-ray data suggest both these crystalline modifications to comprise interdigitated and tilted alkyl chains.

• Author: Caroline Ericsson; Louise C Ericsson; Vitaly Kocherbitov; Olle Söderman; Stefan Ulvenlund
• Department/s: Physical Chemistry
• Publishing year: 2005
• Language: English
• Pages: 2970-2977
• Publication/Series: Physical Chemistry Chemical Physics
• Volume: 7
• Issue: 15
• Links: http://dx.doi.org/10.1039/b502922h
• Document type: Journal article
• Publisher: Royal Society of Chemistry
• Topic: Physical Chemistry
• Status: Published
• ISBN/ISSN/Other: ISSN: 1463-9084