Food grade calcium hydroxide for corn nixtamalization is a purified, high-purity form of slaked lime (Ca(OH)₂) used to cook and steep maize kernels in an alkaline solution. This traditional process, called nixtamalization, softens the corn, removes the pericarp, and enhances flavor, aroma, and nutritional value.
Why is food grade calcium hydroxide essential for nixtamalization?
Only food grade calcium hydroxide is safe for human consumption, as it meets strict purity standards and limits heavy metals. It raises the pH of the cooking water, which breaks down hemicellulose and pectin in the corn cell walls. This makes the kernels easier to grind and improves the bioavailability of niacin and calcium in the final masa.
How does nixtamalization work chemically?
When corn is boiled in an alkaline calcium hydroxide solution, the hydroxide ions hydrolyze the corn's outer layers. This releases bound niacin and converts some starch into gelatinized form. After steeping overnight, the kernels are washed to remove excess lime, leaving nixtamal ready for grinding into dough.
What should you look for in a calcium hydroxide supplier?
Choose a reputable calcium manufacturer or calcium supplier who provides a certificate of analysis (COA) confirming food grade status. Many buyers source from China calcium salts producers, but verify that the product meets FCC or E526 standards. Consistent particle size and low magnesium content are also important for uniform nixtamalization.
Is food grade calcium hydroxide safe to use at home?
Yes, when used in the correct proportions—typically 1% to 2% of the corn's weight. Always wear gloves and avoid inhaling the powder, as it is caustic in concentrated form. After cooking and rinsing, the residual calcium hydroxide is minimal and safe for consumption.
常见问题
Can I use agricultural lime instead of food grade calcium hydroxide for nixtamalization?
No. Agricultural lime may contain heavy metals, arsenic, or other contaminants that are unsafe for human consumption. Always use food grade calcium hydroxide that meets FCC or E526 purity standards to ensure safety and consistent results.
How much calcium hydroxide should I add to corn for nixtamalization?
A common ratio is 1% to 2% of the corn's weight, dissolved in enough water to cover the kernels. For example, 1 kg of corn typically uses 10–20 g of food grade calcium hydroxide. Adjust slightly based on kernel hardness and desired flavor.
Does nixtamalization with calcium hydroxide add calcium to the corn?
Yes. The alkaline cooking process allows calcium ions to penetrate the kernels, increasing the calcium content of the final masa. This is one reason nixtamalized corn products can contribute meaningfully to dietary calcium intake.
