Oxidation kinetics of 2-dimethylaminoethanethiol hydrochloride by ferricyanide ion in acid medium

Abstract

Clustering could affect both ion distribution and ion transport. Model calculations were recently carried out by Simons and Kedem8 for an array of rectangular pores in an ion-exchange medium, not assuming homogeneous ion distribution. From these calculations it appears that the distribution coefficient is quite sensitive to pore size, at given average charge density, but the relation between salt rejection and salt distribution is only slightly influenced. It is thus possible 3641 that in practice the correlation given in eq 6 is valid in systems for which not all the assumptions of the TMS model are justified. 961).

Immobilization of Enzymes through One-Pot Chemical Preoxidation and Electropolymerization of Dithiols in Enzyme-Containing Aqueous Suspensions To Develop Biosensors with Improved Performance

“…The BDT suspensions without an oxidant showed turbidity; however, those solely with an oxidant (K 3 Fe(CN) 6 or BQ, suspensions 4 and 7) gave some precipitates, owing to the generation of more poorly soluble BDTO from oxidation of SH in BDT and then S-S linking (with K 3 Fe(CN) 6 as an example; see below), as reported previously for chemical/electrochemical oxidation of dithiols/thiols. 27,[35][36][37] In contrast, the BDT suspensions in the presence of GOx and a later added oxidant (K 3 Fe(CN) 6 or BQ, suspensions 5 and 8) showed improved dispersibility, suggesting that the amphiphilic GOx acted here as a "surfactant" and effectively assisted the dispersion of the poorly soluble BDTO. 38 It is interesting that brown products were obtained in suspensions 7 and 8, which may be due to the Michael addition of the thiol-containing nucleophile (BDT) to R,β-unsaturated ketone (BQ).…”

“…As shown in Figure , 1.0 mg of BDT was ultrasonically dispersed in 1.0 mL of pH 7.0 PBS (suspension 1), the prepared suspension was further mixed with 1.0 mg of GOx (suspension 2), 10 mM K 4 Fe(CN) 6 (suspension 3), 10 mM quinol (suspension 6), 10 mM K 3 Fe(CN) 6 (suspension 4), 10 mM BQ (suspension 7), 1.0 mg of GOx + 10 mM K 3 Fe(CN) 6 (suspension 5), and 1.0 mg of GOx + 10 mM BQ (suspension 8), respectively. The BDT suspensions without an oxidant showed turbidity; however, those solely with an oxidant (K 3 Fe(CN) 6 or BQ, suspensions 4 and 7) gave some precipitates, owing to the generation of more poorly soluble BDTO from oxidation of SH in BDT and then S−S linking (with K 3 Fe(CN) 6 as an example; see below), as reported previously for chemical/electrochemical oxidation of dithiols/thiols. ,– …”