𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Direct rate constant measurement of radical disulphide anion formation for cysteine and cysteamine in aqueous solution

✍ Scribed by Stephen P. Mezyk

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
338 KB
Volume
235
Category
Article
ISSN
0009-2614

No coin nor oath required. For personal study only.

✦ Synopsis

The techniques of pulse radiolysis, laser photolysis and absorption spectroscopy have been used to directly determine rate constants for radical disulphide anion formation for cysteine and cysteamine in aqueous solution. The measured values for cysteine, over the pH range 7-12, allowed calculation of individual rate constants for the constituent reactions RS "+ RSH RSSR-'+ H ÷ and RS'+ RS-~ RSSR-' as (3.39 + 0.31) x 108 and (1.21 ___ 0.04) X 109 dm 3 mo1-1 s -t, respectively. Analogous values for cysteamine were also determined by this technique as (3.06 + 0.16) x 10 s and (3.65 + 0.07) x 109 dm 3 mol -1 s-l.

📜 SIMILAR VOLUMES

Self- and cross-termination rate constan
Self- and cross-termination rate constants for the isopropylol radical and its anion in aqueous solution
✍ Lung-Min Wu; H. Fischer 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 218 KB 👁 1 views

## Abstract Rate constants for the self‐ and cross‐termination of the isopropylol radical [(CH~3~)~2~ĊOH] and its anion [(CH~3~)~2~ĊO^−^] in aqueous solution are determined by kinetic electron spin resonance. Whereas the self‐termination of the neutral radical occurs close to the diffusion‐controll

Rate constants for the bimolecular self-
Rate constants for the bimolecular self-reactions of ethyl, isopropyl, and tert-butyl radicals in solution. A direct comparison
✍ D. Griller; K. U. Ingold 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 188 KB 👁 1 views

## Abstract A competitive method involving the direct measurement of radical concentrations by EPR spectroscopy has been used to show that in solution at 25°C the rate constants for the bimolecular self‐reactions of ethyl, isopropyl, __tert__‐butyl, cyclopentyl, and trichloromethyl are all approxim