Skip to main content
. Author manuscript; available in PMC: 2013 Aug 7.
Published in final edited form as: J Phys Chem B. 2012 May 1;116(18):5329–5341. doi: 10.1021/jp210954v

Figure 1.

Figure 1

Cysteamine (CyaSH) and cystamine (CyaSSCya). Pulse radiolysis of Ar-saturated solutions of 1 mM CyaSSCya (2HCl), 10 mM H2SO4, and 2 M t-BuOH. Panel A: Absorption spectra at 1.2 µs (squares), 3 µs (triangles) and 8.5 µs (circles) after pulse. Dose: approximately 150 Gy. Panel B: Absorption-vs-time profiles at 280 nm (open squares) and 330 nm (gray circles). Dose: approximately 150 Gy. Panel C: Kinetic traces used to determine rate constants. Circles: experimental conditions as for panels A and B, except that data were acquired with a low dose of 31 Gy; at λ = 285 nm a fit gives kobs = 2.5 × 105 s−1. Open squares: 0.64 mM CyaSH, 0.9 M NaN3, N2O-saturated, dose = 15 Gy; at λ = 420 nm the fit gives kobs = 1 × 105 s−1. Panel D: Pulse radiolysis of N2O-saturated aqueous solution, pH ca. 3.5 (adjusted with HCl), containing 1 mM CyaSSCya (2×HCl) and 1 M t-BuOH. Dose: ca. 140 Gy.