General Tips for Using Xanthan Gum and Guar Gum in Gluten-Free Cooking(from glutenfreecoooking.about.com)
Xantham gum is made by fermenting corn sugar with a microbial called "Xanthomonas campestris."
Both xantham gum and guar gum act as binders, emulsifiers, and thickeners in the absence of gluten. Without them, your baking may end up as a pile of crumbs. If, however, you use too much xantham gum, your baked goods may come out heavy, gummy, and even slimy.
So, say you are using a GF, AP flour blend that has no xantham gum in it. Therefore, when your gluten-free cookie recipe unhelpfully calls for a GF, AP flour blend containing xantham gum, you are at a loss. How much xantham gum should you use? Here are some helpful guidelines:
- Bread and pizza dough recipes: Add 1 teaspoon xanthan gum or guar gum per cup of gluten-free flour used in bread and pizza dough recipes
- Cake, muffin and quick bread recipes: Add 1/2 teaspoon xanthan gum or guar gum per one cup of gluten-free flour used
- Cookie and bar recipes: Add 1/2 teaspoon (or less) xanthan gum or guar gum per one cup gluten-free flour used