Calcium sulfate dihydrate (CaSO4 2H2O), commonly known as gypsum, is a naturally occurring mineral that has been used in food production for centuries. The Chinese have relied on it as a tofu coagulant for generations, and today it appears in everything from bread and beer to canned vegetables and frozen desserts.
Recognized as GRAS by the FDA under 21 CFR 184.1230 and designated as E516 in the EU, food-grade calcium sulfate is valued for its neutral taste, white odorless appearance, and versatility across multiple food categories. With a calcium content of 16% to 20%, it also serves as an effective fortification ingredient.
Tofu Production and Soy Coagulation
Calcium sulfate dihydrate acts as a coagulant in tofu manufacturing, reacting with hot soy milk to form curds. The resulting tofu has a slightly firm yet tender and somewhat brittle texture that consumers prefer in many traditional preparations. Compared to magnesium chloride or glucono delta-lactone, calcium sulfate produces a tofu with a milder, more neutral flavor.
Because it coagulates more slowly than some alternatives, calcium sulfate gives manufacturers better control over the final texture. This gradual reaction allows for a more uniform curd structure and consistent product quality across production batches.
Bread Baking and Dough Conditioning
In commercial baking, calcium sulfate dihydrate serves as a dough conditioner that strengthens gluten structure and reduces stickiness during manufacturing. It also functions as yeast food, providing calcium that supports yeast growth and improves leavening. Bread made with calcium sulfate typically has better volume and longer shelf life.
For flour fortification, calcium sulfate is a primary source of supplemental calcium. Its high calcium content and low cost make it a practical choice for enriched bread programs. It also acts as a pH buffer, helping maintain optimal acidity levels throughout the dough fermentation process.
Brewing and Beverage Applications
Brewers have used calcium sulfate dihydrate for hundreds of years to adjust water chemistry. It adds permanent hardness to brewing water and reduces pH, which is especially useful when working with reverse osmosis or soft water sources. Pale ales and India pale ales in particular benefit from the mineral profile that calcium sulfate provides.
The addition of calcium sulfate in brewing improves product stability, creates a smoother taste, and extends shelf life. It can also enhance hop bitterness perception, which is why it is sometimes called “brewing gypsum” in the craft beer community.
Canned, Frozen, and Dairy Applications
Calcium sulfate dihydrate is commonly found in canned vegetables, where it serves as a firming agent that prevents tissue breakdown during heat processing. In frozen foods, it improves shelf life and can help reduce sodium levels. Jarred jellies and jams also use it as a stabilizer to maintain consistent gel structure.
In dairy products such as blue cheese, condensed milk, and milk powder, calcium sulfate contributes to texture and stability. It also appears in ice cream formulations where it acts as a processing aid and calcium source.
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