Food companies are rushing to find natural replacements for food colorings that are being phased out, a task that’s more challenging than it might seem. Researchers at the University of Missouri think a variety of purple corn could be a good substitute for some red dyes that are proving particularly tough to replace. They are also working on ways to adapt the variety to Midwest growing conditions in hopes of adding another potential revenue stream for farmers.
Adoption of natural food dyes is growing at an accelerated pace largely due to government interventions.Recently, the FDA banned the use of FD&C Red 3 dye in food starting from January 2027. In addition, the State of California has passed legislation prohibiting the use of FD&C Red 3 dye as a colorant in food products, as well as another law banning six of the nine FDA-approved synthetic food dyes from public school cafeterias. A number of other US states are working on similar laws.
The reasoning behind the new rules are mostly tied to possible adverse health impacts, although the science remains strongly debated. However, some of these dyes are derived directly from petroleum, and growing consumer awareness has driven the push to find replacements. Public concern has also increased around research linking some synthetic dyes with possible behavioral effects in susceptible children.
Natural colors have historically faced a major commercial weakness: instability. Many plant pigments lose intensity when exposed to heat, light, oxygen, shifting acidity or long storage periods. A colorant may look excellent in a lab sample yet fade in a bottled beverage, a shelf-stable snack, or a product that undergoes pasteurization.
University of Missouri researchers say “Maíz Morado”, a dark purple corn native to the South American Andes, may overcome part of that hurdle. In their testing, roughly 75% of the corn’s key color compounds remained intact after one hour of elevated heat exposure—conditions relevant to food manufacturing. When the pigments were encapsulated in protective food-grade materials, retention for some compounds rose to nearly 97%, allowing the team to create shelf-stable powders that could be easier to store, ship and formulate into products.
The vibrant dark purple hue of Maíz Morado comes from high concentrations of anthocyanins—the same natural antioxidant compounds that color blueberries, grapes, and red cabbage. Other corn varieties could also be candidates. Purple corn encompasses a broader group of pigmented varieties, and breeding programs have developed lines with differing anthocyanin profiles, yields and shades. Earlier research at the University of Illinois used the Apache Red strain to breed 20 purple-corn varieties, each with a distinct combination of anthocyanins.
That diversity matters commercially. Food manufacturers do not need one universal “purple” dye; they need dependable ingredients that achieve specific hues in specific products. A beverage maker might want a stable reddish-purple in an acidic drink, while a snack producer may prioritize heat tolerance and a powder format. Different colored-corn lines could eventually be bred and processed for these distinct applications.
A primary agricultural hurdle is that native South American purple corn strains do not adapt well to the Midwestern climate. To build a domestic supply chain, researchers are crossbreeding Maíz Morado with high-performing yellow corn varieties adapted to Missouri. The goal is to produce hybrid crops that deliver intense pigmentation alongside the yields and resilience required by American farmers, creating a high-value crop alternative.
A domestic colored-corn industry could also keep more value within rural supply chains. Farmers would grow the grain, while regional processors could separate the pigment-rich outer kernel layers, extract anthocyanins, stabilize the material and sell food-grade powders or liquid colorants to ingredient companies. That creates potential demand not only for acres, but also for cleaning, storage, processing, quality testing and transportation.
The business case remains dependent on contract pricing, processing capacity, seed availability and proof that food makers will pay a premium for corn-derived colors. Still, the removal of synthetic dyes creates a market opening at a moment when natural-color suppliers are under pressure to offer stable, scalable alternatives. Maíz Morado and other colored corns could give U.S. agriculture a timely chance to supply that demand with a crop farmers already know well. (Sources: University of Missouri, FSA USDA, NCAT, Phys.org)
