Chelating agents complexation

Charles s and Gay-Lussac s law Relation stating that at constant P and n, the volume of a gas is directly proportional to its absolute temperature, 106-107, 111 Chelating agent Complexing ligand that forms more than one bond with a central metal atom the complex formed is called a chelate, 411-412 natural, 424-425 synthetic, 424-425 Chemical equation Expression that describes the nature and relative amounts of reactants and products in a reaction, 60-61. See also Equation, net ionic. 

Figure 12-7. Proposed sites of inhibition (0) of the respiratory chain by specific drugs, chemicals, and antibiotics. The sites that appear to support phosphorylation are indicated. BAL, dimercaprol. TTFA, an Fe-chelating agent. Complex I, NADHiubiquinone oxidoreductase complex II, succinate ubiquinone oxidoreductase complex III, ubiquinohferricytochrome c oxidoreductase complex IV, ferrocytochrome ctoxygen oxidoreductase. Other abbreviations as in Figure 12-4.

Phenolic acids and flavonoids can also act as chelating agents, complexing transition metals that are responsible of the initiation of peroxidative processes (Fenton and Haber-Weiss reactions). This property is much stronger in phenolics having a catechol, pyrogallol, or 3-hydroxy-4-carbonyl group [130]. 

Chelating agents complex-forming agents having the ability to solubilize heavy metals. 

Metal—/ vivo site + Chelating agent -+ Metal—Chelating agent complex... 

Chelating agents Complex formation with metals... 

M (at in vivo binding site) + chelating Agent in vivo binding site + M-chelating agent complex... 

Metal — in vivo site + chelating agent -I- metal-chelating agent complex... 

Track-etched polycarbonate filters and hydrophilic cellulose membrane filters (both 0.2 micron pore diameter, Whatman Filter Co.) were used to recover supernatant solutions. Total chelating agent and metal ion-chelating agent complex concentrations were determined using a Quanta 4000E capillary electrophoresis instrument (Waters Corp.) and bare fused-silica capillaries (75 microns wide, 60 cm long. Polymicro Technol.). The capillary electrolyte consisted of 25 mM phosphate buffer (pH 7.0) and 0.5 mM tetradecyl trimethylammonium bromide (TTAB) electroosmotic flow modifier (see (29)). 

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