6 documents found, page 1 of 1
Effects of different solutes on the physical chemical properties of aqueous sol...
Silva, Nuno Miguel Sampaio Ribeiro Magalhães; Ferreira, Luisa A.; Belgovskiy, Alexander I.; Madeira, Pedro P.; Teixeira, J. A.; Mann, Elizabeth K.The Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) spectra of the OH-stretch band in aqueous solutions of inorganic salts and organic materials; Na2SO4, NaCl, NaClO4, NaSCN, trimethylamine N-oxide, urea, poly(ethylene glycol), polyvinylpyrrolidone, and copolymer of ethylene glycol and propylene glycol (Ucon) were studied at various concentrations. The decomposition of the band into four Gauss...
Hydrogen bond arrangement is shown to differ in coexisting phases of aqueous tw...
Madeira, Pedro P.; Titus, Amber R.; Ferreira, Luisa A.; Belgovskiy, Alexander I.; Mann, Elizabeth K.; Mann Jr., Jay Adin; Meyer, William V.Analysis by attenuated total reflection-Fourier transform infrared spectroscopy shows that each coexisting phase in aqueous two-phase systems has a different arrangement of hydrogen bonds. Specific arrangements vary for systems formed by different solutes. The hydrogen bond arrangement is shown to correlate with differences in hydrophobic and electrostatic properties of the different phases of five specific sys...
Linear relationships between partition coefficients of different organic compou...
Silva, Nuno R. da; Ferreira, Luisa A.; Madeira, Pedro P.; Teixeira, J. A.; Uversky, Vladimir N.; Zaslavsky, Boris Y.Analysis of the partition coefficients of small organic compounds and proteins in different aqueous two-phase systems under widely varied ionic compositions shows that logarithms of partition coefficients for any three compounds or proteins or two organic compounds and one protein are linearly interrelated, although for protein(s) there are ionic compositions when the linear fit does not hold. It is suggested t...
Effects of sodium chloride and sodium perchlorate on properties and partition b...
Silva, Nuno R. da; Ferreira, Luisa A.; Teixeira, J. A.; Uversky, Vladimir N.; Zaslavsky, Boris Y.Effects of two salt additives, NaCl and NaClO4, at the fixed concentrations of 0.215?M on the properties of aqueous two-phase systems (ATPSs) formed by dextran (Dex) and polyethylene glycol (PEG), and the effects of NaClO4 at the same concentration on the properties of ATPS formed by PEG and Na2SO4 were examined. The effects of these salt additives on partitioning of 12 small organic compounds and five proteins...
Interrelationship between partition behavior of organic compounds and proteins ...
Ferreira, Luisa A.; Silva, Nuno R.; Wlodarczyk, Samarina R.; Loureiro, Joana A.; Madeira, Pedro P.; Teixeira, J. A.; Uversky, Vladimir N.Partition behavior of adenosine and guanine mononucleotides was examined in aqueous dextran-polyethylene glycol (PEG) and PEG-sodium sulfate two-phase systems. The partition coefficients for each series of mononucleotides were analyzed as a functions of the number of phosphate groups and found to be dependent on the nature of nucleic base and on the type of \ATPS\ utilized. It was concluded that an average cont...
Interrelationship between partition behavior of organic compounds and proteins ...
Ferreira, Luisa A.; Silva, Nuno R. da; Wlodarczyk, Samarina R.; Loureiro, Joana A.; Madeira, Pedro P.; Teixeira, José A.; Uversky, Vladimir N.Partition behavior of adenosine and guanine mononucleotides was examined in aqueous dextran-polyethylene glycol (PEG) and PEG-sodium sulfate two-phase systems. The partition coefficients for each series of mononucleotides were analyzed as a functions of the number of phosphate groups and found to be dependent on the nature of nucleic base and on the type of ATPS utilized. It was concluded that an average contri...