Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 8
Articles | Volume 23, issue 8
https://doi.org/10.5194/bg-23-2747-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-2747-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 8
Technical note
 | 
21 Apr 2026
Technical note |  | 21 Apr 2026

Technical note: Development of an extraction protocol and colorimetric analysis for alginate in marine sediment

Sota Nakazato, Takashi Kawahara, Reiji Ichii, Shingo Akita, Akira Inoue, Masaki Fujita, Hideyuki Kurihara, Mitsuhiro Nakaya, and Atsushi Ooki

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Short summary
Seaweeds can store carbon in the ocean, but traditional methods in food chemistry fail to measure alginate—a major organic component derived from brown algae—in seafloor mud. We developed a novel extraction method for alginate in marine sediments. This allows for high recovery rates, and we successfully used this method to quantify alginate in marine sediments from northern Japan. Our work establishes a reliable method to track alginate on the ocean floor.
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