Interaction of cationic vesicle with ribonucleotides (AMP, ADP, and ATP) and physicochemical characterization of DODAB/ribonucleotides complexes.
The interaction between ribonucleotides (AMP, ADP, and ATP) and cationic vesicles prepared from dioctadecyldimethylammonium bromide (DODAB) were investigated in detail. The physicochemical properties of ribonucleotides/cationic lipid complexes were present. Gel exclusion-UV spectroscopic results showed that all the charge ratios of DODAB/ribonucleotides (AMP, ADP, and ATP) are 2:1 when the maximal ribonucleotides were adsorbed onto DODAB, while the molar ratios were different, e.g., 2:1 for DODAB/AMP, 4:1 for DODAB/ADP and 6:1 for DODAB/ATP. These differences may be attributed to the different anion charges of AMP, ADP and ATP. The results demonstrated that ribonucleotides combined with DODAB vesicles with the electrostatic attraction in the complexation of DODAB and ribonucleotides. Transmission electron microscopic results revealed the different extents of aggregation of cationic vesicles in the complexation process of ribonucleotides with cationic lipid. The variation dependence of zeta-potentials or electrophoretic mobilities on vesicle size was also different. The zeta-potentials and electrophoretic mobilities of the DODAB vesicles (0.01 and 0.02 mM) gradually decreased when the ribonucleotide concentration increased. However, the mean diameters of the DODAB vesicles (0.1 and 0.5 mM) gradually increased when the ribonucleotide concentration increased.
Liu
Shuhua
S
State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R. China.
Lu
Gongxuan
G
D000244:Adenosine Diphosphate / Q000737:chemistry; D000249:Adenosine Monophosphate / Q000737:chemistry; D000255:Adenosine Triphosphate / Q000737:chemistry; D000327:Adsorption; D002412:Cations / Q000737:chemistry; D004337:Drug Carriers / Q000737:chemistry*; D004586:Electrophoresis; D005782:Gels / Q000737:chemistry; D008051:Lipid Bilayers / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012265:Ribonucleotides / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D053835:Unilamellar Liposomes / Q000737:chemistry*
D002412:Cations; D004337:Drug Carriers; D005782:Gels; D008051:Lipid Bilayers; D000644:Quaternary Ammonium Compounds; D012265:Ribonucleotides; D053835:Unilamellar Liposomes; C015831:dimethyldioctadecylammonium; D000249:Adenosine Monophosphate; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate