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CHP: cumene hydroperoxide. Significantly different (P < 0.05) from * = control, a = C[Cl.sub.4], b = SGs, and c = SGs + C[Cl.sub.4].
GPx was measured by NADPH oxidation, using a coupled reaction system consisting of GSH, GR, and cumene hydroperoxide (Tappel 1978).
The reference MVPs formulation uses cumene hydroperoxide as free radical initiator, in combination with a metal redox activator (aqueous solution of ferrous sulphate and diethylenetriamine), to promote cross-linking between polyester and styrene at relatively low temperatures [3], This cure initiator system is added to the aqueous phase at the beginning of the curing step.
In contrast, GST2 was not shown to be catalytically active towards hydrogen peroxide and cumene hydroperoxides. The conjugation of both isoforms with a lipid peroxidation product such as trans,trans-hepta 2.4- dienal also suggested that both the isoforms may play a role in combating oxidative stress due to lipid peroxidation.
Machado, "Effect of oxidative stress, produced by cumene hydroperoxide, on the various steps of protein synthesis.
Diethylenetriamine (DETA, 98% purity), cumene hydroperoxide (CHP, technical grade 80%) were provided by Sigma--Aldrich.
TMB reacts with cumene hydroperoxide by the peroxidase action of hemoglobin to produce a blue color (3).
Reticulation of UP with styrene was then initiated adding 0.12 g of cumene hydroperoxide and 0.01 g of ferrous sulphate.
The redox initiator system consisted of cumene hydroperoxide (CHP), sodium pyrophosphate (SPP), dextrose (DX), and iron (II) sulfate (FeSO4).
(a) Chemical name Abridged name Formula [M.sub.w] (kg/mol) dicumyl peroxide DCP [??] 270 di-4-tert-butylcyclohexyl peroxide BCHPC [??] 398 di-tert-butyl peroxide DTBP [??] 146 cumene hydroperoxide CHP [??] 152 dibenzoyl peroxide BPO [??] 242 Chemical name [MATHEMATICAL [E.sub.A] EXPRESSION NOT ([kJ/mol]) REPRODUCIBLE IN ASCII] ([degrees]C) dicumyl peroxide 132 129.3 di-4-tert-butylcyclohexyl peroxide 64 128.1 di-tert-butyl peroxide 141 130.7 cumene hydroperoxide 166 132.5 dibenzoyl peroxide 91 122.3 (a) [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] ([degrees]C) represents the temperature at which the half-life time of peroxide is hour.
For low temperature methods, commonly used initiators include diacylperoxides, peresters, diaryl and dialkyl per oxides, ketone peroxides (i.e., methyl ethyl ketone peroxide), and hydroperoxides (i.e., cumene hydroperoxide).
For curing of vinyl ester resins, the commonly used initiators are organic peroxides and hydroperoxides, including methyl ethyl ketone peroxide, benzoyl peroxide and cumene hydroperoxide, etc.