Aqueous Phase Behavior of a 1-O-Phytanyl-β-d-xyloside/Water System. Glycolipid-Based Bicontinuous Cubic Phases of Crystallographic Space Groups Pn3m and Ia3d

Temperature- and concentration-dependent aqueous phase diagram of a novel alkylglycoside, 1-O-phytanyl-β-d-xyloside (β-Xyl(Phyt)), was studied using small-angle X-ray scattering, polarizing optical microscopy, and differential scanning calorimetry. The phases found in this system include an Lc phase...

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Published inLangmuir Vol. 20; no. 26; pp. 11366 - 11373
Main Authors Hato, Masakatsu, Yamashita, Itaru, Kato, Tadashi, Abe, Yutaka
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 21.12.2004
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Summary:Temperature- and concentration-dependent aqueous phase diagram of a novel alkylglycoside, 1-O-phytanyl-β-d-xyloside (β-Xyl(Phyt)), was studied using small-angle X-ray scattering, polarizing optical microscopy, and differential scanning calorimetry. The phases found in this system include an Lc phase, an Lα phase, an HII phase, two inverted cubic phases of crystallographic space groups Pn3m and Ia3d, and a fluid isotropic phase, FI. The phase diagram of the β-Xyl(Phyt)/water system is similar to that for the 1-monooleylglycerol (MO)/water system, suggesting that the phase behavior is largely determined by the overall molecular shape rather than the details of surfactant molecular structure. Moreover, the structural parameters of the β-Xyl(Phyt) liquid crystals are also similar to those of the MO/water, due primarily to the similar molecular dimensions of two molecules. As compared to the MO/water system, however, the β-Xyl(Phyt)/water system displays a lower value of T K (∼8.5 °C) and a wider temperature window for the mesophases (8.5−120 °C). Moreover, β-Xyl(Phyt) is chemically more robust than MO, as the ether linkage is more stable against hydrolysis than the ester linkage and the phytanyl chain is fully saturated.
Bibliography:ark:/67375/TPS-4PGJXDPR-8
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ISSN:0743-7463
1520-5827
DOI:10.1021/la030410b