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Intercalation of lecithins for preparation of layered nanohybrid materials and adsorption of limonene
Abstract The intercalation of biosurfactants (lysolecithin and lecithin) in layered clay mineral supports was investigated to assess the suitability of the resulting nanohybrid materials as flavor and fragrance delivery system. The protonated biosurfactant molecules (pH=2.3) were intercalated into the Na-montmorillonite, whereas the deprotonated biosurfactants (pH~12) were intercalated into Mg–Al layered double hydroxides. The amount of lysolecithin and lecithin bound to the layered adsorbents was estimated by measuring adsorption isotherms. The basal spacing obtained from X-ray diffraction measurements suggested that the molecules are arranged in parallel with the layers of montmorillonite, whereas in the case of layered double hydroxides, the adsorbed molecules are in a vertical position between the layers. The interaction of layered adsorbents and biosurfactants was further evidenced by infrared spectroscopy. The intercalated montmorillonite and LDH particles were then probed for their ability to intercalate limonene molecules. Only the lysolecithins modified samples adsorbed limonene. The theoretical sizes of molecules and their possible arrangement between the layers were modeled by HyperChem 7.0 molecular calculations to correlate the ability to bind the lecithins in the confined space of the layered materials.
Highlights ► Lysolecithin and lecithin in layered silicate and LDH were intercalated. ► The protonation/deprotonation of the lecithin were controlled as function of the pH. ► The biosurfactant orientation in confined space was determined. ► Nanohybrid composites for flavor and fragrance delivery system were prepared.
Intercalation of lecithins for preparation of layered nanohybrid materials and adsorption of limonene
Abstract The intercalation of biosurfactants (lysolecithin and lecithin) in layered clay mineral supports was investigated to assess the suitability of the resulting nanohybrid materials as flavor and fragrance delivery system. The protonated biosurfactant molecules (pH=2.3) were intercalated into the Na-montmorillonite, whereas the deprotonated biosurfactants (pH~12) were intercalated into Mg–Al layered double hydroxides. The amount of lysolecithin and lecithin bound to the layered adsorbents was estimated by measuring adsorption isotherms. The basal spacing obtained from X-ray diffraction measurements suggested that the molecules are arranged in parallel with the layers of montmorillonite, whereas in the case of layered double hydroxides, the adsorbed molecules are in a vertical position between the layers. The interaction of layered adsorbents and biosurfactants was further evidenced by infrared spectroscopy. The intercalated montmorillonite and LDH particles were then probed for their ability to intercalate limonene molecules. Only the lysolecithins modified samples adsorbed limonene. The theoretical sizes of molecules and their possible arrangement between the layers were modeled by HyperChem 7.0 molecular calculations to correlate the ability to bind the lecithins in the confined space of the layered materials.
Highlights ► Lysolecithin and lecithin in layered silicate and LDH were intercalated. ► The protonation/deprotonation of the lecithin were controlled as function of the pH. ► The biosurfactant orientation in confined space was determined. ► Nanohybrid composites for flavor and fragrance delivery system were prepared.
Intercalation of lecithins for preparation of layered nanohybrid materials and adsorption of limonene
Nagy, Katalin (Autor:in) / Bíró, Gábor (Autor:in) / Berkesi, Ottó (Autor:in) / Benczédi, Dániel (Autor:in) / Ouali, Lahoussine (Autor:in) / Dékány, Imre (Autor:in)
Applied Clay Science ; 72 ; 155-162
21.11.2012
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Montmorillonite , LDH , Intercalation , Lecithin , Lysolecithin , Limonene
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