1:1, 2:1, and Apparent association constants for a series of electron donor–acceptor complexes involving 1,3,5-trinitrobenzene and tetrafluoro-p-benzoquinone (fluoranil)

1975 ◽  
pp. 1256-1259 ◽  
Author(s):  
Alan A. S. Bright ◽  
John A. Chudek ◽  
Roy Foster
Keyword(s):  
Electron Donor ◽  
Association Constants ◽  
Donor Acceptor ◽  
Apparent Association Constants ◽  
Apparent Association

scholarly journals Association of neutral red with micelles and its effect on the pKa

1993 ◽  
Vol 71 (11) ◽  
pp. 1785-1791 ◽  
Author(s):  
Robin K. Dutta ◽  
Subray N. Bhat
Keyword(s):  
Equilibrium Constants ◽  
Sodium Dodecyl ◽  
Surfactant Solution ◽  
Neutral Red ◽  
Association Constants ◽  
Alkyltrimethylammonium Bromides ◽  
Surfactant Solutions ◽  
Constant Ph ◽  
Apparent Association Constants ◽  
Apparent Association

The interactions of neutral red with cationic surfactants, viz., N-hexadecylpyridinium chloride and alkyltrimethylammonium bromides; a nonionic surfactant, viz., Triton X100; and an anionic surfactant, viz., sodium dodecyl sulfate, were investigated spectroscopically. The equilibrium constants for the association of the indicator with the micelles were determined from the apparent association constants at constant pH at 298 K. The effects of the indicator-micelle association on the apparent pKa of the indicator in aqueous surfactant solutions are discussed. It was shown that the apparent pKa of the indicator in cationic surfactant solution can be predicted from knowledge of the indicator-micelle association constant.

Cadmium transport in blood serum

2010 ◽  
Vol 26 (4) ◽  
pp. 195-201 ◽  
Author(s):  
Amir Shokooh Saljooghi ◽  
SJ Fatemi
Keyword(s):  
Human Serum ◽  
Association Constants ◽  
Appreciable Amount ◽  
Binding Assays ◽  
Molar Ratios ◽  
Cadmium Transport ◽  
Decreasing Ph ◽  
Ethanesulfonic Acid ◽  
Apparent Association Constants ◽  
Apparent Association

The binding of Cd2+ to human serum transferrin in 0.1 M N-(2-hydroxyethyl) piperazine-N ′-2-ethanesulfonic acid and 5 mM sodium bicarbonate at pH 7.4 has been studied by difference ultraviolet spectrophotometry. The apparent association constants were found to be 2.61 × 105 M —1 and 8.51 × 104M— 1, respectively. These association constants are pH-dependent, reducing with both increasing and decreasing pH. The apparent pKa values were found to be 4.93 and 5.42. Competitive assays of binding of Cd2+ to transferrin in the presence of citrate and human serum albumin at molar ratios corresponding to those found in normal plasma showed that a considerable amount of Cd2+ was not bound to transferrin. The competitive binding assays indicate that ∼50% of Cd2+ is bound to transferrin, ∼37% to albumin and reminder to citrate. These results therefore suggest that, although transferrin at pH 7.4 is the major Cd 2+-binding component of plasma, an appreciable amount of Cd2+ may be bound to albumin.

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