Scientists have developed the first fluorescent nanosensor capable of detecting indole-3-propionic acid (IPA) - a metabolite produced by gut bacteria breaking down dietary tryptophan. Scientists have developed the first fluorescent nanosensor capable of detecting indole-3-propionic acid (IPA) - a metabolite produced by gut bacteria breaking down dietary tryptophan. (Nanowerk News) Researchers from the National Institute of Educati... [7795 chars]