Amphoteric polymer

In the separation of membrane proteins, detergent must be incorporated in the eluent because membrane proteins are not soluble in common buffer 

Peak Chain length of component (base-pairs) 

3 Other polymers [15]. There are not many amphoteric polymers other than proteins and nucleic acids, and only a few results of high-performance aqueous SEC separations have been reported. One example is the separation 

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Harding, I. H., and T. W. Healy (1985), "Electrical Double Layer Properties of Amphoteric Polymer Latex Colloids", J. Coll. Interf. Sd. 107, 382-397. 

While DADMAC is primarily employed in homo- and copolymerization as a monomer to produce cationic or amphoteric polymers or gels, it is also a source for the synthesis of sulfobetains or sulfobetains with additional anionic groups by sulfocyclization, sulfocyclosulfonation, or sulfocyclosulfination [36]. Figure 3 summarizes these reactions. 

Both PS Y-6272 and PS YB-4163 show similar, non-Newtonian viscosity behavior, can be cast into flexible films, and stabilize oil-water emulsions.317 Attempts to N-deacetylate PS Y-6272 and PS YB-4163 with aqueous alkali to produce an amphoteric polymer failed, owing to gross decomposition of the products.318... 

The polymerized ionic liquid (IL) shows great promise for diverse applications. Some polymerization methods have already been oriented toward specific applications. Polymerized ILs are useful in polar environments or where there are ion species for transport in the matrix. Amphoteric polymers that contain no carrier ions are being considered for several porposes in polymer electrolytes. Zwitterionic liquids (ZBLs) were introduced in Chapter 20 as ILs in which component ions cannot move with the potential gradient. ZILs can provide ion conductive paths upon addition of salt to the matrix. It is therefore possible to realize selective ion transport in an IL matrix. If the resulting matrix can form solid film over a wide temperature range, many useful ionic devices can be realized. This chapter focuses on the preparation and characteristics of amphoteric IL polymers. 

The synthcsi.s of amphoteric chelating polymers (see Scheme 4) is of interest since a metal complexation reaction by chelating group.s involves release of an equivalent amount of protons. Amphoteric polymers of type 12A act as buffers, and thus assist in the complexation reaction. One route to 12A starts from chloromethylpolystyrene (2A, XE-305 type) via partial amination (the diethylamino group could be further quaternized by inter-... 

U.S. 6506372 (2003) Dubief et al. (L Oreal) Amphoteric polymer with at least one monomeric unit from (meth)acrylate or (meth)acrylamide having at least one fatty chain (C8-C30) Improved disentanglement and softness... 

O and N carboxy methyl CS Reductive alkylation Direct alkylation Formation of an amphoteric polymer which extends the range of pH, enhancing CS solubility in different solvents Modified drug delivery pH responsive drug delivery DNA delivery Targeted drug delivery Permeation enhancer Cosmetics... 

In hydrogenation of various substrates, the activities of rhodium complexes 58-60 with ligands were different. The complex 58 was most active its activity was comparable to the activity of the Wilkinson complex and exceeded the activity of catalysts based on functionalized polystyrenes, polyethylenes, and amphoteric polymers [175]. 

Furusawa and Anzai investigated the heterocoagulation of a highly monodisperse amphoteric polymer latex (particle diameter 250 nm, lEP ca. pH 6.8 in 5.0 mM KCl background electrolyte, positively charged at low pH) onto various silica spheres (diameters 240, 460, 960, and 1590nm lEP ca. pH 3.0) dispersed in pure water or upon addition of various hydroxypropyl celluloses (HPCs) [17, 18]. Stable dispersions for both individual particles under the condition that they had opposite... 

Amphoteric polysaccharides are challenging to formulate they can be soluble when cationic or anionic, but insoluble in their zwitterionic form. These polyglycans can also have complex chemistries in the presence of salts and surfactants. Salts can modify the pH at which amphoteric polymers become zwitterionic. Surfactant behavior is more complex. When the amphoteric polymer is cationic, it is incompatible with anionic surfactants... 

Of the other types, amphoteric, structured and natural flocculants are perhaps the most important. In the former, the polymer molecules contain both cationic and anionic charge sites and/or functional groups. Although amphoteric polymers need to be manufactured under very carefully controlled conditions and little seems to be known about their modus operandi, there are claims for the improved flocculation of materials such... 

Tamagawa H, Taya M (2000) A theoretical prediction of the ions distribution in an amphoteric polymer gel. Mater Sci Eng A 285(l-2) 314-325 Tanaka T, Fillmore DJ (1979) Kinetics of swelling of gels. J Chem Phys 70(3) 1214-1218 Tanaka T, Nishio I, Sun S-T, Ueno-Nishio S (1982) Collapse of gels in an electric field. Science 218 467 69... 

Gaillard, N. and C. Favero (2010). High molecular weight associative amphoteric polymers and uses thereof, Google Patents. 

The amphoteric polymers are highly soluble in water. They impart significantly higher viscosities in aqueous salt solutions than in deionized water. The commercial utility of these polymers is largely unexplored. They may find thickening applications in brine viscosification and superabsorbancy [2]. 

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