The evidence for the amphoteric nature of proteins is less direct, since such definite compounds have not been isolated; it is based on the application of physico-chemical methods. The method of electrical conductivity was applied to the study of proteins in acid or alkaline solutions by Sj枚...
The results showed that both proteins could be effectively adsorbed on the membrane, but the adsorption capacities were influenced by the pH, the initial protein concentration and the CMCS content in the membrane. Because of the amphoteric nature of the protein and the CS/CMCS membrane, the pH ...
In line with this view is the fact that the activity of the cationic formulations did not depend on either the nature of the anionic or the cationic lipid.In further experiments, the guanido lipid PONA was combined with CHEMS, DMGS or DOGS. Again, a systematic variation of the ratios of...
The principle of IEF is based on the fact that certain biological materials (such as proteins, peptides, nucleic acids, and viruses) and even some living cells are amphoteric in nature--i.e., they are positively charged in an acidic media and negatively charged in a basic media. At a pa...
Process for treating aqueous streams containing biosolids comprising contacting the aqueous flows with a First Organic cationic Polymer and an Anionic inorganic Colloid (1) and (2)) an amphoteric cationic Organic Polymer, and mixtures of the same Molecular Weight greater than 1000000 (Divisional Sun....
Loeb (``Proteins and the Theory of Colloidal Behavior'', New York, 1922) have shown that the iso-electric point of amphoteric substances is readily determined by staining them with basic or acidic ions or dyes at known hydrogen-ion concentrations. The method has since been applied for the ...
The electrostatic interactions between amphoteric polymethyl methacrylate latex particles and proteins with different pI values were investigated. These latex particles possess a net positive charge at low pH, but they become negatively charged at high pH. The nature and degree of interactions between ...
In line with this view is the fact that the activity of the cationic formulations did not depend on either the nature of the anionic or the cationic lipid.In further experiments, the guanido lipid PONA was combined with CHEMS, DMGS or DOGS. Again, a systematic variation of the ratios of...
THE amphoteric ionic behaviour, one of the characteristics of proteins, has been considered to be due to the presence of the amino- and the carboxyl-groups in the side-chains of the polypeptide chain. Since the natural proteins consist of various amino-acids and their structures are very ...
The amphoteric fatliquor of N-amidel- polyethylene polyamine -β-aminopropionic acid types has been synthesized by nature oil and fat reaction with polyethylene polyamine and acrylic acid . 用天然油脂、多乙烯多胺和丙烯酸合成制得N -酰胺基多乙烯多胺 - β -氨基丙酸型两性加脂剂 ,最佳合成条件分...