Scientists are now focusing on agricultural by-products to meet the global demand for sustainable nutrition. An innovative study is characterized by American Chemical Society publications Research shows that pot marigold (Calendula officinalis) can serve as a stable and heat-stable protein source. Although people typically grow these plants for decorative and medicinal uses, researchers found that marigold petals contain a protein isolate that is more heat-stable than traditional sources such as peas and chickpeas. This finding is remarkable for the food industry, as approximately 40% of marigold biomass is currently discarded as agricultural by-products. By utilizing this floral residual biomass, the industry has the opportunity to develop powerful plant-based emulsions and high-protein additives while supporting a circular bioeconomy and reducing environmental impact.
Marigold now called ‘the protein source of the future’
Central to this discovery lies the structural elasticity of marigold proteins. Research shared by the American Chemical Society (ACS) shows that calendula proteins can withstand higher temperatures before denaturing than many commercial plant proteins. This property means that the protein retains its functional integrity when exposed to high temperatures during processes such as pasteurization or baking. Therefore, it is ideal for manufacturing plant-based products that require a longer shelf life.
The secret behind marigold glutamate
Research shows that marigold protein isolate has excellent emulsifying properties. These proteins are rich in essential amino acids and flavor precursors, such as glutamic acid and aspartic acid, which are responsible for the “umami” taste, as noted in research published in the ACS publication. Due to this unique chemical composition, these proteins enhance nutrients and naturally enhance the flavor of salty foods.
Why ‘upcycled’ marigold protein is the future of food
In addition, the Food and Agriculture Organization of the United Nations (FAO) emphasizes the importance of “value addition,” which includes converting waste into valuable resources to ensure future food supplies. Marigold, already grown around the world for its essential oil, offers another opportunity: using the petals left over after oil extraction to produce protein, creating a supplementary revenue stream for producers while also reducing the carbon emissions associated with plant-based protein production.
Why calendula is more stable than soy and whey
Research shows that marigold protein produces more stable oil-in-water emulsions compared to soy and whey proteins. The USDA emphasizes the importance of finding alternative proteins that do not compete with staple food crops such as soybeans. This is critical to maintaining biodiversity and ensuring food supply chains remain resilient to climate-related crop failures.
