Seaweed as a sustainable source of vegan protein isolates and hydrolysates in the development of functional cookies
This study demonstrates that brown seaweed (*Sargassum tenerrimum*), particularly when processed into protein isolates and bromelain-derived hydrolysates, serves as a sustainable, nutritionally enriched, and sensorially acceptable ingredient for developing functional vegan cookies with enhanced antioxidant properties.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
For decades, the search for sustainable food has focused heavily on what grows on land, yet the ocean offers a vast, largely untapped reservoir of nutrition. Seaweed, often dismissed as mere beach debris or a niche ingredient in Asian cuisine, is increasingly recognized by scientists as a powerful source of protein that requires no fresh water, no arable land, and no fertilizer to cultivate. Unlike traditional crops that compete with human food supplies for soil, seaweed thrives in the sea, absorbing carbon and growing rapidly. As the global population rises and the demand for plant-based proteins intensifies, researchers are turning their attention to these marine plants not just as a novelty, but as a practical solution for feeding the world. The challenge, however, lies in transforming these slippery, fibrous algae into familiar, palatable foods that people actually want to eat every day.
In a recent study, a team of researchers from India set out to bridge this gap by turning a specific type of brown seaweed, known as Sargassum tenerrimum, into a functional ingredient for everyday snacks. The scientists focused on two methods of processing the seaweed to make it more useful for baking. First, they created protein isolates, which are essentially the pure protein extracted from the seaweed, stripping away the other components. Second, they produced protein hydrolysates by treating these isolates with an enzyme called bromelain. This enzymatic process breaks the long protein chains into smaller, more digestible pieces, a technique often used to unlock hidden nutritional benefits in food. The researchers then took these two forms of processed seaweed, along with the raw seaweed powder itself, and mixed them into cookie dough at a level of five percent by weight. They baked batches of cookies, comparing them against a standard control batch made without any seaweed, to see how the marine addition changed the final product.
The results showed that adding seaweed did more than just alter the flavor; it fundamentally upgraded the nutritional profile of the snack. The cookies fortified with seaweed protein isolates and hydrolysates contained significantly more protein than the standard version, reaching levels between 14.85 percent and 15.44 percent, compared to just over 10 percent in the control cookies. This increase was not merely a matter of quantity; the seaweed-enriched cookies also retained higher levels of minerals, contributing to a richer ash content, which is a measure of the mineral residue left after burning. Perhaps most notably, the cookies made with the enzymatically treated seaweed hydrolysates displayed a marked boost in their ability to fight oxidative stress. When tested, these cookies showed stronger antioxidant activity, meaning they were better at neutralizing harmful free radicals in the body, and they contained higher levels of total phenolic compounds, which are natural chemicals known for their health-protecting properties.
Beyond the chemistry, the physical and sensory qualities of the cookies held up well. The addition of the seaweed ingredients did make the cookies slightly harder and darker in color, shifting them from a pale golden hue to a deep, rich brown. However, this change in appearance was not a drawback; in fact, the darker color reminded the tasters of chocolate or cocoa-based treats, which are popular and widely accepted. When a panel of untrained tasters sampled the cookies, they rated the seaweed versions very highly, with scores ranging from "liked moderately" to "liked very much." The texture and taste were deemed acceptable, proving that the seaweed protein did not overpower the familiar flavor of a cookie. The study concluded that incorporating five percent of this brown seaweed, particularly in its processed hydrolysate form, is a viable strategy for creating a snack that is not only delicious but also nutritionally superior, offering a sustainable path to enriching everyday foods with marine-derived protein.
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