4-Ethylphenylsulfate is a uremic toxin which belongs to the class of compounds known as phenylsulfates. 4-Ethylphenylsulfate is synthesized in the intestine from tyrosine or phenylalanine. Tyrosine is consumed through foods such as cheese, soy products, chicken, turkey, fish, peanuts, almonds, avocados, bananas, milk, yogurt, cottage cheese, lima beans, pumpkin seeds, and sesame seeds while phenylalanine is consumed through foods such as milk, eggs, cheese, nuts, soybeans, chicken, beef, pork, beans and fish. They are taken up by gut micorbes in the Intestine, most commonly Clostridioides bacteria. In the bacteria Tyrosine is matabolized into 4-Hydroxyphenylpyruvic acid , which is dehydroxylated into p-Hydroxyphenylacetic acid. p-Hydroxyphenylacetic acid metabolized into Desaminotyrosine or 4-hydroxypropionic acid. This is metabolized into 3-ethylphenol which is transported back into the intestine. The same metabolism occurs to phenylalanine except the 4-hydroxy group is not present. This is metabolized into phenylpyruvic acid Phenylacetic acid which is then metabolized into 3-(3-Hydroxyphenyl)propanoic acid. This is also metabolized into 4-Ethylphenol which is also transported back into the intestine. In the intestine, the 4-Ethylphenol produced from both tyrosine and phenylalanine is metabolized via a sulfotransferase into the uremic toxin 4-Ethylphenylsulfate. 4-ethylphenol sulfate is a uremic toxin which has been found to be correlated with autistic symptoms in rats. It has also been found to be related to cardiovascular mortality and to cause cell apoptosis.

Metabolsim and Physiological Effects of 4-Ethylphenylsulfate References