Wheat Starch: What It Is, Uses, Gluten and Cornstarch Compared

By Black Wheat Team | Last updated: November 2026

Wheat starch is the fine, white carbohydrate powder left after the protein (gluten), bran and germ are washed out of wheat flour. It’s almost pure starch, so it thickens sauces, gives dim sum wrappers their see-through look and softens some baked goods. In the US you’ll usually find it at Asian grocery stores, sometimes labeled “wheat starch” or “tang flour.” It comes from wheat but holds only traces of gluten, which makes the gluten question tricky. For a refresher on how the grain itself is built, see our whole wheat flour guide.

What is wheat starch made of?

It’s made of starch granules from the wheat endosperm, the soft inner part of the kernel. Those granules contain two molecules: amylose, roughly a quarter, and amylopectin, the rest. The commercial powder is about 99% carbohydrate with only small traces of protein, fat and minerals left behind.

A wheat kernel has three parts. The bran is the outer skin, the germ is the small embryo, and the endosperm is the big starchy center that feeds the young plant. The starch comes entirely from the endosperm.

Under a microscope, it looks unusual. It has two kinds of granules: large, flat, lens-shaped A-granules and tiny round B-granules. Corn and potato starches don’t have this two-size pattern. It’s one reason this starch behaves a little differently in the kitchen.

How is wheat starch made?

It’s made by mixing wheat flour with water into a dough or batter, then washing it. The gluten proteins stick together into a stretchy mass, while the starch granules wash out into the water. The starch is then separated, refined, dried and milled into a fine white powder.

Factories use large wet-milling systems with centrifuges and screens. The two main products are starch and vital wheat gluten, which is sold separately for bread baking and seitan.

You can see the same process in your own kitchen in about 20 minutes. Mix 250 g (about 2 cups) of all-purpose flour with 150 ml water into a firm dough and rest it for 30 minutes. Knead it under a bowl of cool water. The water turns milky. That’s starch. Keep changing the water until it runs almost clear, and you’ll be left holding a rubbery ball of gluten.

Let the milky water stand for a few hours and the starch settles to the bottom. Pour off the water, spread the wet starch thin and dry it fully before storing. It’s a fun experiment, but homemade starch is not gluten-free and shouldn’t be used for anyone with celiac disease.

Curious what the washed-out gluten actually is? Our wheat protein guide explains gliadins, glutenins and how much protein different flours contain.

Is wheat starch gluten-free?

Ordinary wheat starch is not gluten-free, because some gluten protein always remains after washing. In the US, a food labeled gluten-free may contain it only if the finished food has less than 20 parts per million of gluten. People with celiac disease should check labels carefully and ask their doctor or dietitian.

This is where things get confusing. According to the FDA’s gluten-free labeling rule, this starch is treated as an ingredient that has been processed to remove gluten. It can be used in gluten-free foods if the final product tests under 20 ppm. International Codex standards and European rules use the same 20 ppm limit, and specially processed “gluten-free wheat starch” is common in European gluten-free breads.

Some celiac experts and advocacy groups are more cautious. Testing studies have found that leftover gluten can vary widely from batch to batch. Some advise people with celiac disease to avoid it altogether, or to eat it only in products clearly labeled gluten-free.

Starch sold in Asian grocery stores for dumplings is usually not tested or labeled gluten-free, so treat it as a wheat product. Because wheat is a major allergen, US labels must still declare wheat. If you have celiac disease, a wheat allergy or gluten sensitivity, please consult your doctor or a registered dietitian before using it. Our guide is black wheat gluten-free? explains how gluten works in wheat.

How does wheat starch compare with cornstarch and wheat flour?

Wheat starch and cornstarch are both nearly pure starch, but the wheat version thickens slightly less and sets into a softer, more opaque gel. Wheat flour contains protein and some fiber as well as starch, so it thickens less strongly and adds flavor. Cornstarch is naturally gluten-free; ordinary wheat starch is not.

In practice, you can usually swap the two starches one-for-one in sauces, adding a little extra if the sauce looks thin. Swapping flour for either starch is different. You’ll need about twice as much flour to get the same thickness.

What is wheat starch used for in cooking?

It’s best known for translucent dim sum wrappers such as har gow and crystal dumplings. It’s also used to thicken sauces and soups, to soften cakes and cookies, in some gluten-free breads in Europe, and in food manufacturing for glazes, fillings and coatings.

Dim sum is where it shines. Mixed with boiling water and a little tapioca starch, it forms a smooth, pliable dough that steams into thin, glossy, almost see-through wrappers. Regular flour can’t do this, because its gluten makes the dough stretchy and opaque.

Bakers sometimes swap a small part of the flour in a cake for a pure starch to lower the protein and get a softer, more tender crumb. A common home trick is to replace about 2 tablespoons per cup of flour.

Does black wheat starch differ from regular wheat starch?

No. Black wheat’s purple pigments, called anthocyanins, sit in the bran and outer layers of the grain, not in the endosperm where starch is stored. So starch isolated from black wheat is white and behaves like normal wheat starch. The difference only shows in whole black wheat flour, which keeps the bran.

This surprises a lot of people. Black wheat looks dark because of pigments in the seed coat and the aleurone layer just under it. The starchy endosperm inside is pale, just like in ordinary wheat. Separate the starch and you get the same white powder.

That also means the plant compounds that make black wheat interesting stay with the bran. If you want them, use whole black wheat flour, not starch made from it. Research on these anthocyanins is still mostly lab and animal work, so treat black wheat as a tasty whole grain rather than a health fix. Learn more in what is black wheat and black wheat vs regular wheat.

A practical tip if you try the home dough-washing method with black wheat flour: the first rinse water may look grey or purple from tiny bran specks. Let it settle, pour off the water and rinse the starch once or twice more. What’s left at the bottom will be white.

The parts of the kernel that wheat starch leaves behind are where most of the fiber and vitamins sit. Our wheat germ vs wheat bran guide explains what each one offers.

Is wheat starch healthy?

It’s a refined carbohydrate. It provides energy, roughly 350 calories per 100 grams, but almost no protein, fiber, vitamins or minerals. It’s fine in small amounts as a thickener or in dumplings, but doesn’t offer the benefits of whole grain wheat flour.

Because it’s nearly pure starch, it’s digested fairly quickly. A spoonful in a sauce for four people won’t make much difference, but dishes made mainly from starch can raise blood sugar more than whole grain foods.

You can compare starches and flours on USDA FoodData Central. If you’re managing diabetes, weight or blood pressure, are pregnant, or are cooking for young children, please consult your doctor or a registered dietitian.

Where to buy wheat starch and how to store it

In the US, it’s sold mainly in Asian grocery stores and online, often in 1-pound bags labeled wheat starch or non-glutinous flour. Expect roughly $2–$6 per pound, though prices vary by store and city. Store it airtight in a cool, dry cupboard, where it keeps for a year or more.

Don’t confuse it with “wheat gluten” or “vital wheat gluten,” which is the opposite product, almost pure protein. Also check that you’re not buying glutinous rice flour, which is a different ingredient entirely.

Unlike whole wheat flour, the starch has no germ oils, so it doesn’t go rancid. Just keep it away from moisture and strong smells. For whole grain flours, which spoil faster, see how to store black wheat flour.

Frequently Asked Questions

Is wheat starch the same as wheat flour?

No. Wheat flour contains starch plus protein, and whole wheat flour also keeps the bran and germ. Wheat starch is only the starch, with almost all the protein washed out.

Can people with celiac disease eat wheat starch?

Only specially processed wheat starch in foods labeled gluten-free, with less than 20 ppm gluten, meets US rules, and some experts still advise caution. Please consult your doctor or a registered dietitian before including it.

Can I use cornstarch instead of wheat starch?

For sauces, yes, usually one-for-one. For dim sum wrappers, cornstarch gives a different, less pliable dough, so wheat starch works better.

Why is wheat starch used for dumpling wrappers?

Without much gluten, wheat starch dough doesn’t stretch or spring back. Mixed with boiling water, it gelatinizes into a smooth dough that steams thin, glossy and translucent.

Is black wheat starch purple?

No. Black wheat’s purple pigments are in the bran and outer layers, while starch comes from the pale endosperm. Isolated black wheat starch is white.

Does wheat starch go bad?

It lasts a long time if kept dry and airtight, often a year or more. Throw it out if it clumps from moisture, smells musty or shows any sign of insects.

Final Thoughts

Wheat starch is simple: the starchy part of the grain, with the gluten washed away. It’s ideal for translucent dumplings and smooth sauces, but it isn’t automatically gluten-free and it isn’t a whole grain. If you’re after the nutrition and colour of black wheat, stick with whole flour. Our black wheat flour roti recipe is a good place to start.

Have a question about wheat starch or black wheat? Get in touch with us.

This article is for general information only and is not medical or nutritional advice. Wheat starch and black wheat contain gluten unless specially processed and labeled gluten-free.