Study summary · research use only
Stability of glutathione added as a supplement to parenteral nutrition
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This in vitro stability study (species not specified) incubated oxidized glutathione (GSSG) for 24 h in combination with components of parenteral nutrition (PN)—dextrose, multivitamins, Primene, and Travasol—and with cysteine, cystine, and peroxides, measuring total glutathione in the solutions over 0-24 h. The abstract reports the combination of cysteine and multivitamins caused the greatest loss of glutathione, multivitamins alone did not affect GSSG stability, cysteine alone accounted for about 20% of GSSG loss, and cysteine plus multivitamins raised the loss to over 70%; removing cysteine prevented the degradation. The authors state GSSG reacts with cysteine to form a cysteine-glutathione mixed disulfide, a potential glutathione precursor substrate.
Abstract
Most very premature newborns (<32 weeks of gestation) receive parenteral nutrition (PN) that is inherently contaminated with peroxides. Oxidative stress induced by PN is associated with bronchopulmonary dysplasia, a main pathological complication in these infants who have weak antioxidant capacity to detoxify peroxides because of their glutathione deficiency. In animals, glutathione supplementation of PN prevented oxidative stress and alveolar loss (the main characteristic of bronchopulmonary dysplasia). Of its two forms-oxidized glutathione (GSSG) and reduced glutathione (GSH)-GSSG was used because of its better stability. However, a 30% loss of GSSG in PN is observed. The potentially high therapeutic benefits of GSSG supplementation on the health of very premature infants make the study of its stability highly important. GSSG was incubated in combination with the following components of PN: dextrose, multivitamins, Primene, and Travasol, and with cysteine, cystine, and peroxides, for 24 h. Total glutathione in these solutions was measured 0-24 h after the addition of GSSG. The combination of cysteine and multivitamins caused the maximum loss of glutathione. The stability of GSSG was not affected by multivitamins. The cysteine was responsible for ∼20% of the loss of GSSG; in the presence of multivitamins, the loss reached >70%. Removing the cysteine prevented the degradation of glutathione. GSSG reacts with cysteine to form cysteine-glutathione mixed disulfide, another suitable glutathione substrate for preterm neonates. The study confirms that GSSG added to PN can potentially provide a precursor to de novo synthesis of glutathione in vivo.
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