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A recent study published in ACS Food Science & Technology indicates that marigold flowers could serve as a viable new source of plant-based protein. Researchers found that proteins extracted from Calendula officinalis, commonly known as the pot marigold, possess functional properties—such as heat stability and emulsification—that may make them useful for modern food manufacturing, including baking and the production of dressings.
As global interest in sustainable, plant-derived nutrition intensifies, the search for alternatives to traditional crops like soy and pea has led scientists to examine unconventional sources. The research, conducted by teams from the University of Georgia (UGA) and the Indian Institute of Technology-Delhi, suggests that marigold petals contain protein levels comparable to quinoa, a well-known plant-based protein staple.
Functional Advantages of Marigold Protein
Beyond basic nutritional content, the study highlights specific technical characteristics of marigold protein that could benefit the food industry. According to Anand Mohan, an associate professor in UGA’s College of Agricultural and Environmental Sciences, the protein extracts demonstrate high thermal stability. This trait allows the ingredient to maintain its structure at temperatures where other common plant proteins, such as those derived from chickpeas or peas, might degrade. Such stability makes marigold protein a potential candidate for high-heat food processing applications, including commercial baking.
The research also identified other functional benefits:
- Emulsification: Certain proteins within the flower help bind ingredients together, a property essential for products like salad dressings and sauces.
- Flavor Profile: The amino acid composition of the flower’s proteins may contribute an umami flavor, potentially enhancing the taste of savory plant-based food formulations.
- Nutritional Density: The flowers are noted for containing minerals such as calcium, potassium, and iron, alongside fiber and antioxidant compounds.
Challenging Perceptions of Ornamental Plants
For many, marigolds are primarily recognized as ornamental flowers used in landscaping or cultural celebrations, such as the Mexican holiday Día de los Muertos or various wedding traditions in India. Fidele Benimana, a doctoral student in UGA’s department of food science and technology and the study’s lead author, emphasizes that this research aims to shift the perspective on how such flowers are utilized.
“Most people see marigolds as ornamental plants, but they also contain proteins with unique functional properties that could be useful in food formulation,” Benimana stated. By repurposing flowers that are often discarded in large quantities, researchers hope to create a more efficient food supply chain. Mohan noted that while the concept is promising, transitioning from laboratory analysis to large-scale food production remains a significant hurdle. “Billions of dollars of flowers are thrown away each year,” Mohan said. “Can you imagine if we were able to take those flowers and use them for food instead?”
Safety and Consumption Guidelines
While the study highlights the potential of Calendula officinalis, researchers caution that not all marigolds are suitable for human consumption. The study focuses specifically on the common marigold, which is distinct from other species.
When used in culinary settings, the petals are typically the only part consumed, as the stems and leaves are known for their bitter taste. The flowers, which can be eaten raw, cooked, or dried for use in teas and soups, are described as having a tangy, citrus-like flavor profile often compared to tarragon. As researchers continue to uncover the chemical properties of common backyard flowers, the study serves as an initial step in evaluating how these blossoms might eventually contribute to the broader market for plant-based ingredients.
The findings are currently documented in the peer-reviewed journal ACS Food Science & Technology.
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