Quick Answer
All three are starches; the difference is the raw material. Taiwanese “taibai fen” is usually potato or tapioca starch and makes clear, glossy sauces and tender marinated meat; sweet potato starch (often made with tapioca starch in stores) is best for frying and stays crisp longer; cornstarch is the usual choice for custard, pudding and Western bakes. For most sauces, cornstarch or tapioca starch can replace potato starch, though clarity and thickness after cooling will differ.
The three starches compared
| Name | Usual source | Texture | Common uses |
|---|---|---|---|
| Potato starch (taibai fen) | Potato or tapioca starch (check the label) | Clear, glossy, silky | Sauces, marinating meat, oyster omelette batter |
| Sweet potato starch | Sweet potato starch; many retail packs use tapioca starch | Crispy, coarse coating | Popcorn chicken, fried pork chops, fen guo jelly |
| Cornstarch | Corn starch | Thick and stable, slightly sweet | Custard, pudding, cookies, cakes |
| Cake flour (for reference) | Wheat | Contains gluten | Cakes and cookies; not a substitute for thickening |
The names are confusing because “taibai fen” is a common name. Taiwan’s Food and Drug Administration allows it, but the package must state whether the starch comes from potato or cassava. When sourcing, the ingredient list is more reliable than the product name.
Which one for thickening?
Potato starch gives a clear, smooth sauce for savory soups and rice toppings. Cornstarch holds its thickness better after cooling, so it suits custards and pie fillings. Sources disagree on which starch thins out less, so test with your own recipe.
Frying and baking
- Crispy frying: coarse sweet potato starch; let the coating rest and hydrate before frying.
- Soft cakes and cookies: replace a little cake flour with cornstarch to reduce gluten and get a finer crumb.
- Chewy desserts: tapioca starch is the base of boba, mochi and fen guo; see what tapioca starch is.
What can replace potato starch?
| Use | Substitute | Note |
|---|---|---|
| Thickening | Cornstarch, tapioca starch | Less glossy; adjust the amount |
| Marinating | Cornstarch | Slightly firmer; add a little water |
| Frying | Sweet potato starch | Coarser and browns more |
How Tang Sugar can help
Tang Sugar supplies potato starch, tapioca starch, sweet potato starch and rice flour, and can quote and ship bakery ingredients together with your bubble tea ingredients in one container. Request samples before a bulk order.
Products in this article
All 8 Tapioca Pearls →
FAQ
Is potato starch the same as cornstarch?
No. Taiwanese “taibai fen” is usually potato or tapioca starch, while cornstarch comes from corn. Both thicken, but clarity and thickness after cooling differ.
Is sweet potato starch made from sweet potatoes?
Traditionally yes, but many retail packs are made with tapioca starch. Check the ingredient list.
Can I swap potato starch and flour?
Not really. Flour contains gluten and makes sauces cloudy; starch has no gluten and cannot replace flour in cakes or bread.
Why add cornstarch to cake batter?
Cornstarch dilutes the gluten in flour, giving a softer, finer cake.
Related Reading
What Is Tapioca Starch? Cassava vs Tapioca, Other Starches, Uses and Origin
Cake Flour vs All-Purpose Flour vs Bread Flour: Protein Content, Uses and How to Store Flour
Tapioca Pearls vs Tangyuan vs Fen Guo vs Taro Balls: Ingredients, Texture and How to Use Them in Bubble TeaAlso see: Starch & rice flour (products)
