Appl Environ Microbiol. 2004 Feb;70(2):1088-1096 Celiac.com 02/26/2004 - Please note that the sourdough bread used in this study is not your garden-variety sourdough bread, and as far as I know it is not commercially available. Even though this study had very promising results, it was conducted on a relatively small number of people, and larger studies need to be carried out before reaching any conclusions about the long-term safety of celiacs consuming this type of sourdough bread. -Scott Adams
Researchers in Europe conducted a novel study which utilized a highly specialized sourdough lactobacilli containing peptidases that have the ability to hydrolyze Pro-rich peptides, including the 33-mer peptide, which is the main culprit in the immune response associated with celiac disease...

Celiac.com 12/03/2008 - Xanthan Gum is a polysaccharide used as a binder in many gluten-free products.  In the production of xanthan gum, sucrose or glucose is fermented by a bacterium, Xanthomonas campestris.   After a four-day fermentation period, the polysaccharide is precipitated from a corn-based growth medium with isopropyl alcohol, dried, and ground into a fine powder.  When added to a liquid medium, a slippery, sticky gum is formed, and this substance works well in holding baked goods together, or keeping separate liquid ingredients in suspension in salad dressings and sauces.
While the above description doesn't make it sound very appetizing, what's the problem with xanthan?  Some people develop an allergy to xanthan, with gastrointestinal symptoms such as bloating, gas, and ...