of corn or peas

Starch is a polysaccharide carbohydrate derived from the endosperm of seeds, particularly corn and peas, serving as the primary energy storage compound in plants. When extracted from these legumes and grains, starch appears as a fine, white, odorless powder with a smooth texture. Corn starch (maize starch) and pea starch each contain glucose polymers arranged in amylose and amylopectin chains, though in varying proportions. Corn starch is the more widely used commercial variety, extracted through wet milling processes that separate the starch from the corn kernel's protein, fiber, and oil components. Pea starch, derived from field peas, has gained prominence in plant-based and specialty applications due to its functional properties and allergen profile.

Both starches exhibit distinct gelatinization temperatures and thickening powers, with corn starch gelatinizing at 62–72°C and pea starch at 60–70°C. Corn starch produces a glossy, translucent gel, while pea starch yields a more opaque, stable thickener with superior freeze-thaw properties, making it valuable in processed foods and vegan formulations.

Corn and pea starches function primarily as thickening agents in sauces, gravies, custards, and soups, where they are typically slurried with cold liquid before incorporation into hot mixtures to prevent lumpiness. In Asian cuisines, corn starch serves as a coating for stir-fried proteins and vegetables, creating a silky texture and light gloss. Pea starch has emerged as a plant-based thickener and binder in vegan cooking, gluten-free baking, and industrial food production, offering superior binding without the gelling properties of corn starch. Both starches are used in baking to reduce gluten development and create tender crumbs, though in modest quantities to prevent gumminess. Pea starch is increasingly employed as a clean-label alternative in processed foods, while corn starch remains essential in Chinese cooking, confectionery, and as a dusting agent for baked goods and pasta.