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1. A new method was used to diminish the autoxidation of GSH. 2. The oxidation of GSH by liver homogenates was studied with regard to concentration of homogenate, concentration of GSH, time, pH and anaerobiosis. 3. GSH was oxidized by recombinations of the supernatant with microsomes and with mitochondria. Each fraction alone caused little oxidation. 4. Proteins in the supernatant were required to obtain the effect, and low-molecular-weight compounds in the same fraction increased its effect. 5. GSH diminished the formation of malonaldehyde in homogenates. 6. GSH prevented a stimulating effect of the supernatant on the formation of malonaldehyde in microsomes and in mitochondria. 7. The malonaldehyde formation in microsomes together with the supernatant did not start until the concentration of endogenous low-molecular-weight thiols had decreased to a low level. 8. It is suggested that part of the oxidation of GSH in homogenates is coupled to a mechanism that counteracts the peroxidation of membrane lipids.

Oxidation of reduced glutathione by subcellular fractions of rat liver