Hydrophilic acids, definition

Classification Hydrophilic colloid Definition Ammonium salt of alginic acid Empirical (C6H706NH4)n... 

Thus, for hydrophilic molecules, there is a clear correlation between the CSF/ serum ratio and the hydrodynamic radius of the molecule. This is applicable only in the presence of a steady-state equilibrium (i.e., when the serum concentration is stable and the exchange conditions at the blood-CSF barrier are undisturbed) (Tib). The ratio for water is by definition 1.0. The concentration of the smaller chloride ion is higher in CSF than in serum therefore, in barrier dysfunction, it decreases in comparison to larger molecules. For most amino acids, active... 

Lactic acid is an example. It is conveniently added to the polyol and upon reaction with the isocyanate, it is inserted into the backbone. Upon exposure to fluids in the body, the polymer is cut at the insertion site. The reduction in tensile properties is dramatic. Although the fragments are suspect, the result is by definition degradable. A number of researchers at W.R. Grace prepared biodegradable hydrophilic polyurethanes by a similar technique but the product was never available commercially. 

Protein chains generally contain hydrophobic, hydrophilic and/or charged amino acid residues, which can be regarded as amphiphilic copolymers in a broad definition. The coordinate and cooperative interactions, such as... 

Lipids are far more diverse chemically than other typical biomolecules such as amino acids, carbohydrates, and nucleotides. The definition of lipids includes simple fatty acids and their glycerol esters, sterols such as cholesterol, and phospholipids, sphingolipids, and cerebrosides. Lipids are generally defined by their common hydrophobic character, which makes them soluble in organic solvents such as chloroform. Virtually all lipids also have a hydrophilic group, which makes them surface active. 

Nonionic surfactants are amphiphilic compounds the lyophilic (in particular hydrophilic) part of which does not dissociate into ions and hence has no charge. However, there are nonionics, for example such as tertiary amine oxides, which are able to acquire a charge depending on the pH value. Even polyethers, such as polyethylene oxides, are protonated under acidic conditions and exist in cationic form. Long-chain carboxylic acids are nonionic under neutral and acidic conditions whereas they are anionics under basic conditions. So, the more accurate definition is as follows nonionics are surfactants that have no charge in the predominant working range of pH. The main part of nonionics can be classified into alcohols, polyethers, esters, or their combinations. 

At least two of the recognized mechanisms for the formation of electrical double layers (Hunter, elal. 1981 Russel etal., 1989) are relevant to LB film depositions (1) ionization of carboxylic acid group and amphoteric acid groups on solid surfaces, and (2) differences between the affinities of two phases for ions or ionizable species. The latter mechanism includes the uneven distribution of anions and cations between two immiscible phases, the differential adsorption of ions from an electrolyte solution to a solid surface, and the differential solution of one ion over the other from a crystal lattice. Since the solid-liquid and the film-liquid interfaces are flat, large surfaces and since both have a large, solid-like concentration, the analysis that follows applies to both interfaces. For an interface conformed by a thin film of an amphiphilic compound with the hydrophilic end of the molecule in contact with the water subphase, the equilibrium of charges is based on pH and subphase concentration. The effect of pH is highlighted by the definition of the of the carboxylic acid ... 

Definition Hydrophilic colloidal carbohydrate derived from brown seaweed, Phaeophyceae polysaccharide composed of p-d-mannuronic acid residues... 

Synonyms POE (6) sorbitan monolaurate Definition Ethoxylated sorbitan ester of lauric acid with avg. 6 moles EO Properties Nonionic Uses Emulsifier for cosmetic oils Features Hydrophilic... 

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