Abstract
Having a diverse gut microbiota has been correlated with the short- and long-term success of allogeneic stem cell transplantation. Intestinal bacteria metabolize the amino acid tryptophan to indole. Indole is further oxidized and sulfonated in the liver to 3-indoxyl sulfate (3-IS), which is then excreted in urine. Urinary 3-IS is a potential biomarker for intestinal health and an early predictor of successful stem cell transplantation. We describe a rapid method for quantifying tryptophan, indole, and 3-indoxyl sulfate in urine specimens, in which urine samples are diluted with a formic acid solution and deuterated internal standards, and then injected on LC-MS/MS for analysis.
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Baird, S., Clinton Frazee, C., Garg, U. (2022). Quantification of Tryptophan, Indole, and Indoxyl Sulfate in Urine Using Liquid Chromatography-Tandem Mass Spectrometry. In: Garg, U. (eds) Clinical Applications of Mass Spectrometry in Biomolecular Analysis. Methods in Molecular Biology, vol 2546. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2565-1_44
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DOI: https://doi.org/10.1007/978-1-0716-2565-1_44
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