The Stability Constants and Thermodynamic Parameters of Borate - Carbohydrate Complexes by pH Measurements

Abstract

The complexation of borate with carbohydrates was studied potentiometrically at temperatures 298.15-328.15K in aqueous medium at constant ionic strength, I = 0.1M KCl. The stability constants (β) and thermodynamic parameters of borate-carbohydrate complexes were determined using the technique proposed by Verchere and Hlaibi.

Borate–fructose complex: A novel mediator for laccase and its new function for fructose determination

“…Here, the optimal pH shifted from 5.0 to 7.5 in the presence of borate and fructose. This was caused by several factors including aforementioned factors and alkali-favored borate and fructose condensation [1]. At higher pH, borate prefers to be condensed as a borate-fructose complex, which could be a substrate for laccase.…”

Diffusion Interactions of Some Biologically Important Transition Metal Complexes on Micellar Properties of Sodium Dodecyl Sulphate

“…[Cr(acac) 2 3 complexes were prepared by the same method as reported in the literature [9][10]. SDS from Merk (Germany) was used after purification by recrystallization using absolute ethanol.…”

“…These have applications in many areas, including chemistry (chemical kinetics or equilibria), biology (as membrane mimetics) and are used to promote the dissociation of proteins from nucleic acids on extraction from biological material and in pharmacy to design drug action mechanism [1]. Model composed of amphiphilic materials and aggregated colloids provide a useful way for better understanding in many invaluable areas, such as, biochemistry, medicine, and pharmaceuticals as well as in catalysis [2,3]. Several research groups [4,5] have studied the kinetics of organic reactions in the presence of surfactant micelles as these can influence the rate of the chemical reactions incorporating the reactant molecules in micellar pseudophase.…”

“…In the present work, our aim was to study the interaction of [Cr(acac) 2 2 ] complexes with anionic surfactant SDS and to reveal the effect of these complexes on the micellar properties of SDS which was investigated based on specific conductance measurement, the widely used method to locate the CMC's of ionic surfactants.…”

“…[Cr(acac) 2 3 complex is a versatile compound to illustrate the principle of chemical equilibria [9]. Citric acid represents a class of carboxylic acids present in biological fluids and playing key roles in biochemical processes in bacteria and humans.…”