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[Abstract] The human body is colonized by vast communities of microbes, collectively known as microbiota, or microbiome. Although microbes colonize every surface of our bodies that is exposed to the external environment, the biggest collection of microbes colonizing humans and other mammals can be found in the gastrointestinal tract. Given the fact that the human gut is colonized by several hundred microbial species, our group hypothesized that the chemical diversity of this environment should be significant, and that many of the molecules present in that environment would have important signaling roles. Therefore, we devised a protocol to extract these molecules from human feces and test their signaling properties. Potentially bioactive extracts can be tested through addition to culture medium and analyses of bacterial growth and gene expression, among other properties. The protocol described herein provides an easy and rapid method for the extraction and testing of metabolites from fecal samples using Salmonella enterica as a model organism. This protocol can also be adapted to the extraction of small molecules from other matrices, such as cultured mammalian cells, tissues, body fluids, and axenic microbial cultures, and the resulting extracts can be tested against various microbial species.

Extraction of Small Molecules from Fecal Samples and Testing of Their Activity on Microbial Physiology