amphoterism

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amphoterism

(ăm'fətĕr`ĭzm), in chemistry, the property of certain substances of acting either as acids or as bases depending on the reaction in which they are involved. Many hydroxide compounds are amphoteric. For example, aluminum hydroxide, Al(OH)3, reacts as a base with common acids to form salts, e.g., with sulfuric acid, H2SO4, to form aluminum sulfate, Al2(SO4)3. It reacts as an acid with strong bases to form aluminates, e.g., with sodium hydroxide, NaOH, to form sodium aluminate, Na[Al(OH)4(OH2)2]. Organic molecules that contain both acidic (e.g., carboxyl) and basic (e.g., amino) functional groupsfunctional group,
in organic chemistry, group of atoms within a molecule that is responsible for certain properties of the molecule and reactions in which it takes part. Organic compounds are frequently classified according to the functional group or groups they contain.
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 are usually amphoteric.

amphoterism

[am′fäd·ə‚riz·əm]
(chemistry)
The property of being able to react either as an acid or a base.
References in periodicals archive ?
106 PATENTS RELATING TO ANTIOXIDANTS 106 Sample of Patents Relating to Antioxidants 106 Ampholytic Copolymer Based on Quaternized Nitrogen-containing Monomers 106 Cosmetic Composition Comprising an Aqueous Extract of Chrysophyllum cainito 107 Pawpaw and Peach Derived Composition 108 Liquid Concentrate for Preserving Cosmetics 108 Cosmetic Use of an Active Agent Capable of Stimulating Tensin 1 Expression 109 7-hydroxy Chromones as Potent Antioxidants 109 PATENTS RELATING TO BOTANICALS 110 Sample of Patents Relating to Botanicals 110 Composition and Method of Preparing a Tomato-based Topical Formulation for Enhanced Healing of Burns, Ultraviolet and Radiation Erythema
When CS is mixed with ampholytic gelatin, when the pH of the medium above the isoelectric point of gelatin, which is a negative charge, the electrostatic interaction occurs between the ammonium ions of CS salts and carboxylic groups of gelatin [61].
BASF researchers have pronounced that they have created ampholytic terpolymers for 2-in-l shampoos that have a strong affinity for keratin substrates even in the presence of anionic surfactants, can provide conditioning on their own due to the presence of a hydrophobic monomer, form complexes with anionic, fatty amines and cationic surfactants for stimuli-responsive deposition for hair conditioning, and they form complex coacervates that can act as deposition aids for silicones beneficial agents.
The interactions of ampholytic terpolymers are studied at differing solution pH and ionic strength.