Adsorption of Sodium Cholate on Cationic Dextran Gels: Comparison of Isotherm Binding Models

Cationic dextran hydrogels having pendent 51-59 mol% N-alkyl-N,N-dimethylammonium chloride groups were synthesized and tested as adsorbents for sodium cholate. The bile acid salt sorption by these gels was evaluated by equilibrium analysis in water and 10 mM NaCl solution. The best adsorption results were obtained with amphiphilic dextran-based gels having two types of pendant ammonium chloride groups with different polarities. Experimental adsorption data for all polymers fitted good with Langmuir, Dubinin-Raduskevich and Temkin models over the entire range of ligand concentrations. The maximum experimental adsorption capacity of dextran sorbents for sodium cholate was in the range 850-1075 mg/g.

Synergetic Effects of DMA Cation Doping and Cl Anion Additive Induced Re-growth and Passivation of MA1-xDMAxPbI3 Perovskite

The simultaneous improvement of photovoltaic performance and stability is crucial for further commercial development of MAPbI3 perovskites. Here we report a dual-ion exchange and alloying method using DMACl (dimethylammonium chloride)...

Synthesis of TFA-protected α-Amino Acid Chloride via a Vilsmeier Reagent for Friedel–Crafts Acylation

α-Amino acid chlorides are reactive coupling agents in amide (peptide) formation. The Vilsmeier reagent ((chloromethylene)dimethylammonium chloride) offers a convenient way to prepare α-amino acid chlorides for peptide synthesis. Its use with N-trifluoracetyl (TFA)-protected isoleucine and allo-isoleucine is described. The 1H-NMR of the α-proton signal offers a convenient way to monitor the chirality retention in the acid chloride forming reaction and subsequent Friedel-Crafts acylation of arenes which result in α-amino acid aryl-ketone with no loss of chirality.

Structure-tunable supraparticle assemblies of hollow cupric oxide sheathed with nanographenes

Self-assembled supraparticles (SPs), a secondary structure of clustered nanoparticles of hollow Cu2O SPs, were prepared using a cationic polyelectrolyte poly(diallyl dimethylammonium chloride) during the formation of Cu2O nanoparticles.