Kelp species, including the genus Laminaria, contain a variety of compounds relevant to the terms in your query, including a full profile of amino acids (with high levels of glycine), sulfated polysaccharides, and the ability to absorb nitrate from seawater.
Kelp and Laminaria Components
Amino Acids: Seaweed proteins are a source of all amino acids, including essential amino acids, which make up nearly half of the total amino acid content. Glycine, alanine, arginine, proline, glutamic, and aspartic acids are particularly abundant.
Nitrate: Algae absorb minerals and nitrogen compounds, including nitrate, from their environment. These elements are essential for protein synthesis.
Sulfate and Sulfated Polysaccharides: Kelp contains sulfated polysaccharides, such as laminarins and fucoidans.