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Extraction of proteins from two marine macroalgae, Ulva sp. and Gracilaria sp., for food application, and evaluating digestibility, amino acid composition and antioxidant properties of the protein concentrates
Abstract
With rising global population and decreasing available land and fresh water resources, the oceans provide an attractive domain for sourcing nutrients. The marine macroalgae Ulva sp. and Gracilaria sp. are candidate raw biomass. Ulva sp. has high growth rate and Gracilaria sp. has high protein content and their seasonal growth is complementary, allowing almost year-round high yield protein production. In this study, we aimed at developing an effective process, to yield a high macroalgae protein content concentrate suitable for food application, and studying the digestibility, amino acid composition and antioxidant properties of the obtained algal protein concentrates (APCs). We developed a new protein extraction protocol, and compared it to several published protocols. The developed protocol is food-grade, and yielded APC from Ulva and form Gracilaria, containing 70 and 86% protein respectively. The amino acid compositions of the APCs suggest their possible use as sources of essential amino acids. Simulated gastro-intestinal digestion showed that APCs proteolysis of at least 89% can be reached. We found that the APCs exhibit antioxidant activity, which is similar to that of known protein isolates in the hydrogen atom transfer mechanism, but 10 to 20 times higher in the single electron transfer mechanism. These results suggest that polyphenolic compounds might be still present in the APCs and contribute to their antioxidant activity. Our results suggest that the protein concentrates extracted from Ulva sp. and Gracilaria sp. seem to be promising sustainable sources for human nutrition thanks to their essential amino acids content, digestibility and antioxidant properties.
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“Cyanobacteria such as Arthrospira also have a high digestibility rate of approximately 86% [57,58].”
From Challenges in Functional Food Products with the Incorporation of Some Microalgae (2024) · cites this paper as [57]
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Metadata
- Authors
- Kazir, M., Abuhassira, Y., Robin, A., Nahor, O., Luo, J., Israel, A., Golberg, A., & Livney, Y. D.
- Affiliations
- Technion – Israel Institute of Technology (IL)
- Tel Aviv University (IL)
- Israel Oceanographic and Limnological Research (IL)
- Corresponding author
- Livney, Yoav D.
- Venue
- Food Hydrocolloids
- Publisher
- Elsevier BV
- Published
- 2019-02
- Volume
- 87
- Pages
- 194-203
- ISSN
- 0268-005X (ISSN-L)
- OpenAlex
- W2885868919
- Cited by
- 269
- References
- 90
- Citations by year
- 2026: 22 · 2025: 35 · 2024: 51 · 2023: 29 · 2022: 51 · 2021: 39 · 2020: 24 · 2019: 16
- FWCI
- 20.29
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Food Hydrocolloids (publishedVersion)
- Funders
- Israel Ministry of Health (#3-00000-12788)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Seaweed-derived Bioactive Compounds
- Life Sciences › Agricultural and Biological Sciences › Food Science › Food Nutrient Composition and Product Development
- Life Sciences › Agricultural and Biological Sciences › Food Science › Proteins in Food Systems
- Keywords
- seaweed, Ulva, Gracilaria, protein extraction, protein digestibility, amino acid composition, antioxidant activity, in vitro digestion, polyphenols, essential amino acids, sustainable nutrition
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