Xantham gum cannot be used as a substitute for gum Arabic. But
gum arabic can be used as a substitute for xanthan gum. Xanthan gum
may cause allergic reactions, especially those who have corn
allergy in some people. For the case, you can substitute for
xanthan gum (see the related link) in a specific amount. Gum arabic
is one of the alternatives. It a natural food stabilizer, which is
derived from the sap of various species of acacia tree. The low
viscosity, high emulsification and adhesion properties make gum
arabic an excellent ingredient in foods.