On the Kinetics of Polymer Degradation in Solution. 5. Pulse Radiolysis of PMMA Using the Light Scattering Detection Method

1977 ◽  
Vol 10 (1) ◽  
pp. 135-138 ◽  
Author(s):  
G. Beck ◽  
D. Lindenau ◽  
W. Schnabel
Keyword(s):  
Light Scattering ◽  
Pulse Radiolysis ◽  
Detection Method ◽  
Polymer Degradation ◽  
Light Scattering Detection ◽  
Kinetics Of ◽  
Kinetics Of Polymer Degradation

On the Free Radical-Induced Aggregation of Ribonuclease — A Pulse Radiolysis Study Using the Light Scattering Detection Method

1982 ◽  
Vol 37 (1-2) ◽  
pp. 63-69 ◽  
Author(s):  
H. Seki ◽  
W. Schnabel
Keyword(s):  
Light Scattering ◽  
Pulse Radiolysis ◽  
Detection Method ◽  
Ribonuclease A ◽  
Enzyme Molecule ◽  
Light Scattering Detection ◽  
Light Scattering Intensity ◽  
The Difference ◽  
Induced Aggregation ◽  
Absorption Measurements

The aggregation of bovine ribonuclease (RNase) induced by either ·OH or Br•̅2 radicals has been studied. These radicals, which were generated by pulse radiolysis of aqueous solutions with 16 MeV electrons, readily attack the enzyme thus producing RNase-radicals which subsequently combine. At initial radical concentrations low enough (≤ 0.1 radical per enzyme molecule) to prevent multimerizations other than dimerization, rate constants for the latter process were determined from the increase of the light scattering intensity after the pulse: 2 k2 = (2.2 ± 0.3) 106 l/mol s (Br•̅2 initiated dimerization) and (5.4 ± 0.4) 106 l/mol s (·OH initiated dimerization). The G-values for dimerization are: 1.3 (Br•̅2)and 0.85 (·OH). Transient optical absorption measurements revealed the existence of phenoxyl radicals of tyrosine (TyrO·) that decayed with a rate constant of 2 k2 (total) = (5.5 ± 0.7) 106 l/mol s (Br•̅2 )-case). The difference between k2 and k2 (total) presumably indicates the occurrence of disproportionation.

Novel system for pulse radiolysis with multi-angle light scattering detection (PR-MALLS) – concept, construction and first tests

2018 ◽  
Vol 142 ◽  
pp. 9-13
Author(s):  
S. Kadlubowski ◽  
P. Sawicki ◽  
S. Sowinski ◽  
B. Rokita ◽  
K.D. Bures ◽  
...  
Keyword(s):  
Light Scattering ◽  
Pulse Radiolysis ◽  
Light Scattering Detection
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