Abstract:

The nutritional compositions of 3 new varieties of Saccharina japonica, “Haitian No. 1”, “Haitian No. 2”, and
“Haitian No. 3”, as well as Kjellmaniella crassifolia were analyzed. The results indicated that the contents of proximate
composition except for ash, such as crude protein, alginate and mannitol, were higher in Saccharina japonica. The contents
of crude protein in both “Haitian No. 1” and “Haitian No. 2” were the highest (10.7%). The content of crude fat (0.3%)
in “Haitian No. 3” was the lowest, and the content of mannitol (15.1%) in “Haitian No. 3” was the highest. The contents
of iodine (0.47%) and alginate (28.2%) in “Haitian No. 1” were the highest among 4 algae. The amino acid composition
showed that the contents of total amino acids in all the 4 algae were 5%–7%, and the contents of essential amino acids
accounted for 30%–40% of the total amino acids (EAA/TAA ratio). Calcium, magnesium and iron were more abundant than
other tested mineral elements.

Key words: Saccharina japonica, nutritional composition, amino acid, nutritional assessment