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WOLFRAM|DEMONSTRATIONS PROJECT

Simulating a Minimal ORAC Kinetic System

​
rate constants
k
a
,
-1
h
0.008
k
p
,
-1
M
-1
h
36
k
x
,
-1
M
-1
h
1800
reactant concentrations
[RNNR], μM
80
[PH], μM
0.04
[XH], μM
1
[​
ROO
​]​, μM
0
This Demonstration shows a representative example of the concentration profiles of the probe over time in an oxygen radical absorbance capacity (ORAC) assay. The induction time and decay regions depend on the initial concentrations of the peroxyl radical initiator
RNNR
, probe
PH
and antioxidant
XH
, and the apparent first- and second-order rate constants
k
a
,
k
p
and
k
x
.
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