Marigolds Emerge as High-Protein Food Source
Researchers at the University of Georgia have identified marigold flowers as a potential high-protein, functional food ingredient, according to a study published in ACS Food Science & Technology. The findings suggest that proteins extracted from the common marigold (Calendula officinalis) offer heat stability, emulsifying properties, and an amino acid profile comparable to traditional plant-based proteins like quinoa.
Competitive Profiles in Commercial Production
The study, led by corresponding author Anand Mohan, an associate professor in the University of Georgia’s College of Agricultural and Environmental Sciences, indicates that marigold petals contain protein levels competitive with established plant-based sources. Beyond basic protein content, the researchers highlighted several functional attributes that could make the flowers useful in commercial food production:
- Thermal Stability: Marigold protein extracts remain stable at higher temperatures than those derived from chickpeas or peas, potentially making them effective for baked goods.
- Emulsification: Certain proteins within the flower assist in binding ingredients, which could improve the texture and consistency of products like salad dressings.
- Flavor Profile: The amino acid composition may contribute an umami flavor to food formulations.
- Micronutrient Density: The petals also provide fiber, calcium, potassium, iron, and antioxidant compounds.
Turning Floral Waste Into Food Assets
The research team emphasizes that the project aims to address both food sustainability and waste reduction. “Billions of dollars of flowers are thrown away each year,” Mohan noted. “Can you imagine if we were able to take those flowers and use them for food instead?”
Fidele Benimana, the study’s first author and a doctoral student in the University of Georgia’s department of food science and technology, stated that the findings challenge the conventional view of marigolds as strictly ornamental, suggesting they hold untapped potential as functional ingredients.
Species Safety and Culinary Heritage
The study focused specifically on Calendula officinalis, the common marigold. The researchers warned that not all flowers classified as marigolds are suitable for consumption. Edible varieties are generally limited to the Calendula species and specific members of the Tagetes genus.
In many cultures, marigolds are already recognized for their culinary and traditional uses. In India, they are frequently used in celebrations, while in Mexico, they are central to the observance of Día de los Muertos. When prepared for food, the bitter stems and leaves are typically discarded in favor of the petals, which can be eaten raw, cooked, or dried for use in teas and soups. According to the research team, the petals provide a citrusy, tangy flavor profile similar to tarragon.
Collaborative Path to Market
While the study offers a new perspective on the culinary utility of marigolds, the authors caution that agricultural and processing challenges remain before these proteins can be integrated into the mainstream market. The research was conducted by a team from the University of Georgia in collaboration with the Indian Institute of Technology-Delhi.