title: Thermodynamics and biological properties of the aqueous solutions of new glucocationic surfactants.
abstract: Thermodynamic properties of aqueous solutions of newly synthesized compounds, namely, N-[2-(beta-D-glucopyranosyl)ethyl]-N,N-dimethyl-N-alkylammonium bromides with hydrophobic tails of 12 (C12DGCB) and 16 (C16DGCB) carbon atoms, determined as a function of concentration by means of direct methods, are reported here. Dilution enthalpies, densities, and sound velocities were measured at 298 K, allowing for the determination of apparent and partial molar enthalpies, volumes, and compressibilities. Changes in thermodynamic quantities upon micellization were derived using a pseudophase-transition approach. From a comparison with the corresponding acetylated compounds N-[2-(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyl)ethyl]-N,N-dimethyl-N-dodecylammonium bromide (C12AGCB) and N-[2-(2,3,4,6-tetra-O-acetyl-beta-D-glucopyanosyl)ethyl]-N,N-dimethyl-N-hexadecylammonium bromide (C16AGCB), the role played in the micellization process by the acetylated glycosyl moiety was inferred: it enhances the hydrophobic character of the molecule and lowers the change in enthalpy of micelle formation by about 1.5 kJ mol(-1). By comparing the volume of C12DGCB with those of DEDAB and DTAB, the volumes taken up by the (beta- d-glucopyranosyl)ethyl and beta- d-glucopyranosyl groups were found to be 133 and 99 cm3 mol(-1), respectively. Regarding the interaction with DPPC membranes, it seems that the sugar moiety of the hexadecyl deacetylated compound gives rise to hydrogen bonds with the oxygen atoms of the lipid phosphates, shifting the phase transition of DPPC from a bilayer gel to a bilayer liquid crystal to lower temperatures. C16AGCB induces significantly greater changes than C16DGCB in the structure of liposomes, suggesting the formation of domains. The interaction is strongly enhanced by the presence of water. Neither compound interacts strongly with DNA or compacts it, as shown by EMSA assays and AFM images. Only C16AGCB is able to deliver little DNA inside cells when coformulated with DOPE, as shown by the transient transfection assay. This might be related to the ability of C16AGCB to form surfactant-rich domains in the lipid structure.
authors.affiliation: Dipartimento di Scienze Farmacologiche, Biologiche e Chimiche Applicate, Università di Parma, Viale G.P. Usberti, 27/A-43100 Parma, Italy. emilia.fisicaro@unipr.it
authors.forename: Emilia
authors.initials: E
authors.lastname: Fisicaro
authors.forename: Carlotta
authors.initials: C
authors.lastname: Compari
authors.forename: Mariano
authors.initials: M
authors.lastname: Biemmi
authors.forename: Elenia
authors.initials: E
authors.lastname: Duce
authors.forename: Monica
authors.initials: M
authors.lastname: Peroni
authors.forename: Gaetano
authors.initials: G
authors.lastname: Donofrio
authors.forename: Francesco
authors.initials: F
authors.lastname: Sansone
authors.forename: Bozenna
authors.initials: B
authors.lastname: Rózycka-Roszak
authors.forename: Hanna
authors.initials: H
authors.lastname: Pruchnik
authors.forename: Nadia
authors.initials: N
authors.lastname: Barbero
authors.forename: Guido
authors.initials: G
authors.lastname: Viscardi
authors.forename: Pierluigi
authors.initials: P
authors.lastname: Quagliotto
mesh_terms: D002152:Calorimetry, Differential Scanning; D002412:Cations / Q000737:chemistry; D045744:Cell Line, Tumor; D005947:Glucose / Q000737:chemistry*; D006801:Humans; D018625:Microscopy, Atomic Force; D008958:Models, Molecular; D008968:Molecular Conformation; D012996:Solutions; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D019076:Transgenes
chemical_list: D002412:Cations; D012996:Solutions; D013501:Surface-Active Agents; D005947:Glucose