Reading up on microbial cellulose it seems like an excellent standard for scientific study. Free of lignin and lignin degradation products as well as many of the hemicellulose contaminants that might be found at low levels. It also has applications as a wound dressing or for artificial tissues and organs. The problem is, I don't see anyone selling it. None of the major suppliers like Sigma or Fisher carry it, as far as I can tell. Does anyone know a source?