Thermotropic phase behaviour of long-chain alkylmaltosides

Caroline Ericsson, Louise C Ericsson, Vitaly Kocherbitov, Olle Söderman, Stefan Ulvenlund

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)2970-2977
JournalPhysical Chemistry Chemical Physics
Volume7
Issue number15
DOIs
Publication statusPublished - 2005

Subject classification (UKÄ)

  • Physical Chemistry

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