compounds, has only been used for the analysis of purified compounds. Schroeder's approach allows NMR to identify compounds without isolating them, for example in a complex mixture such as partially fractionated urine. The technique revealed three completely new compounds, each of which was subsequently synthesized and injected into rats. The rats' urine was then monitored.
Two of the identified compounds, both derivatives of a common metabolite xanthurenic-acid, raised sodium levels in the rat's urine but kept potassium levels constant. Schroeder said that while aldosterone (which does the opposite) is a steroid hormone, this newly discovered molecule is structurally more similar to such amino acid-derived neurotransmitters as dopamine and serotonin and, therefore, may also play other roles in the body.
"Now, we want to know what other functions these compounds have and whether they directly influence blood pressure," said Schroeder.
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