The study, published in ACS Food Science & Technology, addresses a growing challenge in food innovation: how to add protein without compromising the taste, appearance or texture consumers expect. Protein enrichment has become common in cereals, snack bars, pasta and beverages, but condiments have received less attention. Ketchup, however, has several characteristics that make it a promising vehicle for functional ingredients. It is widely consumed, relatively shelf-stable and already contains strong flavors from tomatoes, vinegar, sugar, salt and spices that may help mask unfamiliar ingredient notes.

The researchers selected Chlorella vulgaris, a single-celled green microalga known for its high protein content and ability to grow rapidly. Unlike many conventional crops, microalgae can be cultivated throughout the year and may require comparatively less land and freshwater. These characteristics have made algae a subject of intense interest as a potential source of alternative protein. The nutritional promise is substantial, but algae-based foods can present sensory challenges, including grassy, marine or otherwise unusual flavors and green or brown color changes.

To create the enriched condiment, the team extracted proteins from C. vulgaris and blended them into ketchup recipes prepared with typical ingredients, including plum tomatoes, sugar, salt, vinegar, spices and citric acid. The formulations contained between 1% and 13% algal protein extract. After preparation, the samples were bottled and pasteurized, a heat-treatment step used to reduce microbial risks and improve product stability. A plain ketchup without added algae was also produced for comparison.

A sensory panel of 15 people then evaluated the samples. The results revealed a narrow but important range in which the nutritional benefits of the algae could be added without overwhelming the product’s identity. Ketchup containing 1% or 3% algal protein retained its familiar sweet, tangy and mildly spiced flavor, while the algal note remained subtle. The samples also maintained the reddish appearance associated with tomato ketchup, an important factor because color strongly influences expectations about flavor and freshness.

The picture changed at higher concentrations. At 5% and especially 13% algal protein, panelists detected a more pronounced algal taste, accompanied by a noticeable greenish shift in color. Although these formulations contained more protein, their acceptability declined. The findings illustrate a recurring problem in food science: increasing the concentration of a functional ingredient does not necessarily improve the product. Beyond a certain threshold, the ingredient’s own sensory characteristics can overpower the food it is intended to enhance.

Chemical and nutritional analyses showed that the 3% and 5% formulations contained approximately two to three times more protein than the plain ketchup. The enriched products also provided greater amounts of essential amino acids, the protein building blocks that the human body cannot produce in sufficient quantities on its own. The researchers reported increases in minerals, particularly sodium and iron, along with higher levels of antioxidant compounds. These results indicate that algal extracts can contribute more than protein alone, although the nutritional significance of each component would depend on serving size and the rest of a person’s diet.

The researchers’ approach is notable because it treats algae not simply as a replacement for animal or plant proteins, but as a concentrated functional ingredient that must be carefully balanced. Whey, soy and pea proteins are already used extensively in fortified foods, yet their production can involve agricultural land, water and energy demands. Microalgae may offer a more resource-efficient alternative in some production systems, but the environmental advantages will depend on cultivation methods, processing energy, water use and the scale of manufacturing. The study therefore points toward a promising ingredient rather than proving that every algae-based product is automatically sustainable.

The next steps will be essential before protein-enriched ketchup can move from the laboratory to supermarket shelves. Larger and more diverse consumer studies could determine whether the preferences observed among the 15 tasters hold across different age groups, cultures and dietary habits. Researchers also plan to investigate shelf life, stability during storage and the feasibility of commercial-scale production. For now, the results suggest that a modest amount of algal protein—particularly around 3%—may offer the best compromise: enough to raise nutritional value while keeping the taste, color and familiarity that make ketchup one of the world’s most recognizable condiments.

Article Title: Protein-Enriched Ketchup Gets Its Boost from Algae Extracts

News Publication Date: 2 July 2026

Web References: https://doi.org/10.1021/acsfoodscitech.6c00450

References: ACS Food Science & Technology, DOI: 10.1021/acsfoodscitech.6c00450

Image Credits: Adapted from ACS Food Science & Technology 2026, DOI: 10.1021/acsfoodscitech.6c00450

Keywords

Algae, Chlorella vulgaris, algal protein, protein-enriched foods, ketchup, food science, sustainable protein, functional ingredients, nutrition, antioxidants

The study, published in Food Science and Biotechnology in late 2025, meticulously examined the insoluble dietary fiber fraction of burdock root, highlighting this often-overlooked component as a reservoir of potent bioactive compounds. Traditionally, dietary fibers have been recognized primarily for their roles in digestive health and gut microbiota modulation; however, this research pivots the spotlight toward the bound polyphenols tightly linked to these fibers, which might hold the key to enhanced anti-inflammatory effects.

Bound polyphenols differ significantly from their free counterparts in that they are covalently attached to cell wall components, making their release and subsequent bioavailability within the human digestive system less straightforward. The research team employed sophisticated extraction and enzymatic digestion techniques to simulate gastrointestinal conditions, thereby accurately assessing the bioaccessibility of these compounds. This approach is critical for translating the in vitro potential of plant polyphenols into tangible health benefits.

Analytical assays revealed a rich diversity of polyphenolic compounds embedded within the insoluble fiber matrix of the burdock root. These included various flavonoids, phenolic acids, and complex tannins, all known for their robust antioxidant properties. The identification and quantification of these molecules were achieved through advanced chromatographic and spectrometric methods, providing insights into the molecular profile that governs their biological functions.

One of the study’s most compelling revelations is the enhanced stability of bound polyphenols during simulated gastrointestinal digestion, as opposed to free polyphenols which typically degrade rapidly. This increased stability implies that bound polyphenols are more likely to reach the colon intact, where they can exert localized anti-inflammatory effects or be metabolized by gut microbiota into other bioactive metabolites, amplifying their health benefits.

Furthermore, the team conducted rigorous anti-inflammatory activity assays using cell culture models representative of human immune responses. Fascinatingly, the bound polyphenols demonstrated significant suppression of key pro-inflammatory cytokines and mediators, suggesting a robust capacity to modulate inflammatory pathways. This is a promising indication that incorporating burdock-derived bound polyphenols into dietary regimes could mitigate chronic inflammation-related disorders such as arthritis, cardiovascular diseases, and neurodegenerative conditions.

The implications of these findings extend beyond simple dietary supplementation. They advocate for the valorization of plant insoluble dietary fibers, often discarded during food processing, as functional ingredients with considerable therapeutic potential. This aligns with the current global movement toward sustainable food systems and the utilization of agro-industrial by-products in health-promoting applications.

Moreover, the synergistic interaction between bound polyphenols and the insoluble fiber matrix might facilitate a prebiotic effect, fostering a healthier gut microbiome composition. Since gut dysbiosis is increasingly associated with systemic inflammatory states, the introduction of burdock root fibers into the diet could serve dual roles—direct anti-inflammatory action and indirect modulation via microbiota.

However, the authors caution that while in vitro results are immensely encouraging, in vivo studies are imperative to confirm bioavailability, metabolism, and clinical efficacy in humans. The complexity of human digestion and interindividual variability might influence the absorption and systemic distribution of these compounds.

Additionally, the study calls for future exploration into optimizing extraction processes that preserve the natural bound state of polyphenols while enhancing their bioaccessibility. This could involve enzymatic treatments or fermentation techniques tailored to unlock these compounds from the fiber matrix without compromising their structural integrity.

From a technological perspective, the ability to harness bound polyphenols from burdock root insoluble dietary fiber presents exciting opportunities for the food industry. Functional foods, nutraceuticals, and dietary supplements enriched with these bioactives could cater to health-conscious consumers seeking natural anti-inflammatory solutions.

The data also encourage a reevaluation of traditional herbal uses of burdock root, used historically in East Asian and Western folk medicine, by providing a molecular basis for its health-promoting effects. This bridge between ancient knowledge and modern scientific validation fosters a deeper appreciation and potential standardization of herbal therapies.

In an era where chronic inflammation is recognized as a common denominator in numerous non-communicable diseases, identifying natural compounds with anti-inflammatory properties is of paramount importance. This research elevates burdock root bound polyphenols as promising candidates in the arena of preventive nutrition.

Lastly, the study underscores the need for interdisciplinary collaboration, integrating food science, biochemistry, pharmacology, and clinical research, to unlock the full potential of plant-based dietary fibers as sources of medically relevant phytochemicals.

As researchers continue to unravel the complexities of plant polyphenol chemistry and their interactions with human biology, findings such as these place burdock root insoluble dietary fiber at the forefront of nutrition science, promising a future where diet-based interventions could significantly curb inflammation and improve public health globally.

Subject of Research: Bound polyphenols from burdock (Arctium lappa L.) root insoluble dietary fiber and their bioaccessibility and anti-inflammatory activity.

Article Title: Bioaccessibility, composition, and anti-inflammatory activity of bound polyphenols from burdock (Arctium lappa L.) root insoluble dietary fiber.

Article References:
Cui, J., He, Y., Zhao, N. et al. Bioaccessibility, composition, and anti-inflammatory activity of bound polyphenols from burdock (Arctium lappa L.) root insoluble dietary fiber. Food Sci Biotechnol (2025). https://doi.org/10.1007/s10068-025-02065-w

Image Credits: AI Generated

DOI: 10.1007/s10068-025-02065-w

Spirulina, a cyanobacterium often mischaracterized as algae, boasts an extraordinary nutrient profile that has fascinated scientists and health advocates alike. Rich in proteins, vitamins, minerals, and antioxidants, spirulina stands out for its dense nutritional content relative to its biomass. The review meticulously catalogs the intricate composition of spirulina, emphasizing its significance as a complete protein source, containing all essential amino acids. This attribute alone positions spirulina as a formidable candidate for addressing protein deficiencies in various populations worldwide, especially in regions grappling with food insecurity.

Beyond mere nutritional content, spirulina harbors a suite of bioactive compounds exerting diverse physiological effects. Phycocyanin, a unique pigment-protein complex responsible for spirulina’s characteristic blue-green hue, exhibits potent antioxidant and anti-inflammatory properties. Yaishana and colleagues highlight recent advances in isolating and quantifying these compounds, indicating their potential to be harnessed not only for direct consumption but also as natural food colorants and nutraceutical ingredients. This dual functionality amplifies spirulina’s appeal within the food industry, marrying health benefits with aesthetic enhancements in product formulation.

However, tapping into spirulina’s full potential requires innovative extraction techniques. Traditional methods often face limitations — prolonged processing times, protein denaturation, and inefficiencies in yield restrict scalability and commercial viability. The review’s focus on ultrasonication-based protein extraction addresses these challenges head-on. Ultrasonication utilizes high-frequency sound waves to induce cavitation, disrupting cell walls and facilitating the release of intracellular proteins without compromising their structural integrity. This technique represents a significant leap in processing technology, offering enhanced extraction efficiency, reduced energy consumption, and improved preservation of protein functionality.

Intriguingly, the review presents comparative analyses demonstrating that ultrasonication surpasses conventional mechanical and chemical extraction methods in both yield and protein quality. The authors reference experimental data illustrating optimal sonication parameters tailored to spirulina biomass, fine-tuning process variables such as frequency, power, and duration to maximize output. The capacity to selectively extract proteins without generating harmful byproducts or extensive denaturation positions ultrasonication as a revolutionary technique for sustainable protein recovery.

From a food application standpoint, the implications of efficient spirulina protein extraction are profound. The extracted proteins exhibit excellent solubility, emulsifying capacity, and gelation behavior — properties crucial for their integration into diverse food matrices. Whether incorporated into plant-based meat alternatives, functional beverages, or fortified snacks, spirulina proteins promise to enhance nutritional profiles while contributing to desirable sensory attributes. This aligns with burgeoning consumer demand for clean-label, plant-derived ingredients that simultaneously promote health and satisfy gastronomic expectations.

Moreover, spirulina’s adaptability and environmental credentials magnify its relevance in the context of planetary health. Unlike conventional protein sources that often require intensive land and water resources, spirulina cultivation can occur in controlled aquatic systems with minimal ecological footprint. The review underscores the scalability of closed-system spirulina farms, capable of producing large biomass quantities under optimized growth conditions. This intersection of nutritional excellence and sustainable production technology embodies a paradigm shift towards resilient food systems capable of addressing the twin crises of malnutrition and environmental degradation.

The authors do not overlook the challenges that must be surmounted to facilitate spirulina’s widespread adoption. Issues related to taste, textural acceptance, and regulatory approval are discussed candidly. Spirulina’s characteristic flavor, sometimes described as earthy or seaweed-like, can pose sensory hurdles in certain applications. However, advances in refining extraction methods, including ultrasonication, hold promise in mitigating unwelcome organoleptic traits. Additionally, regulatory frameworks are gradually evolving to accommodate the unique status of spirulina-derived ingredients, paving the way for novel product developments within established safety standards.

It’s also noteworthy that the review addresses the synergy of spirulina proteins with other bioactive components inherent in the biomass. The presence of polyphenols, vitamins, and essential fatty acids augments the functional properties of spirulina-based products. These compounds act in concert to exert antioxidant, immunomodulatory, and metabolic benefits, enriching the consumer experience beyond basic nutrition. The holistic approach adopted by Yaishana et al. highlights spirulina’s potential as a multi-dimensional food ingredient delivering health-promoting attributes through integrated bioactivity.

Technological innovations extending beyond ultrasonication are briefly touched upon, indicating a dynamic research landscape exploring enzymatic hydrolysis, pulsed electric fields, and supercritical fluid extraction. These complementary or alternative methodologies are poised to further refine the extraction and functionalization of spirulina proteins and phytochemicals. The review situates ultrasonication within this evolving toolkit, emphasizing its current prominence and practical advantages while acknowledging ongoing advancements that may shape future applications.

As the world faces unprecedented challenges related to nutrition security, chronic disease prevalence, and environmental sustainability, spirulina emerges as a beacon of hope. The comprehensive examination presented in this review consolidates current knowledge and charts a roadmap for leveraging spirulina’s multifaceted capabilities in food science and biotechnology. By integrating advanced extraction technologies with a deep understanding of spirulina’s compositional nuances, researchers and industry stakeholders are well-positioned to unlock new horizons in functional food development.

In conclusion, the extensive review by Yaishana and colleagues offers a compelling narrative that transcends disciplinary boundaries, linking microbiology, biochemistry, process engineering, and nutrition science. Spirulina’s ascendancy from traditional health food to mainstream functional ingredient is propelled by scientific rigor and technological innovation, with ultrasonication-based protein extraction exemplifying this trend. As spirulina-infused products gain traction in global markets, this research provides a foundational framework supporting sustainable expansion and consumer acceptance.

Given these insights, the broader implications extend into policy-making and education, where awareness of spirulina’s benefits and processing capabilities can stimulate investment, regulatory clarity, and consumer enthusiasm. The review ultimately crystallizes a vision where spirulina contributes meaningfully to resilient food systems, equitable nutrition, and environmental stewardship in the decades ahead.

Subject of Research: Spirulina composition, biochemical properties, protein extraction via ultrasonication, and food industry applications.

Article Title: A comprehensive review on spirulina composition, properties, extraction of protein using ultrasonication and its food application.

Article References:

Yaishana, T., Bora, S., Afzia, N. et al. A comprehensive review on spirulina composition, properties, extraction of protein using ultrasonication and its food application.
Food Sci Biotechnol (2025). https://doi.org/10.1007/s10068-025-01957-1

Image Credits: AI Generated

DOI: https://doi.org/10.1007/s10068-025-01957-1