Xanthan Gum

What it is

A microbial polysaccharide produced by bacterial fermentation (Xanthomonas campestris) of sugars. Fine cream-white powder. Vegan, gluten-free. A cornerstone of modern gluten-free baking.

How it's made

Xanthomonas bacteria ferment glucose/sucrose; the gum they secrete is recovered with alcohol, dried, and milled.

Flavor profile

Neutral; can taste slightly slimy if overdosed.

Culinary uses & behavior — In gluten-free baking, tiny amounts (often well under 1% of flour weight) mimic gluten's viscoelasticity — building dough cohesion, trapping leavening gas, and stopping crumbly collapse, so GF breads, doughs, and batters hold together. It's also a powerful, cold-soluble thickener and stabilizer that's strongly shear-thinning (thick at rest, flows when stirred/poured), prized for salad dressings, sauces, gluten-free and modernist cooking, and keeping suspensions stable. It can do gluten-like binding and stable thickening in minute doses; it cannot, by itself, give the open, bread-like structure of real gluten, and too much turns things gummy or slimy.

Regional variations

A globally standardized modern food ingredient rather than a regional one.

Cultural & historical context

Developed by the USDA in the 1960s, xanthan gum became foundational to the gluten-free and clean-label food era — arguably the single ingredient most responsible for making palatable commercial gluten-free bread possible.

Reference notes

Tags: `hydrocolloid`, `gum`, `fermentation-derived`, `vegan`, `gluten-free`, `gluten-replacer`, `stabilizer`. Related ingredients: [Guar Gum], [Psyllium Husk]. Related cuisines: gluten-free / modernist. Suggested links: → Gluten-free flour blends, → Guar Gum, → Hydrocolloids.