Xanthan gum, a high-molecular-weight extracellular polysaccharide widely used as a thickener, emulsifier and stabilizer in food with the European food additive number E415. It is different from other polysaccharide gums (same with gellan gum) as made from bacterial fermentation while others are extracted from or parts of a plant.
http://www.chinafooding.com/Xanthan_Gum
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