Figure 3.

Cell wall structure and chemical compositions of Chlorella vulgaris. C. vulgaris cell wall has a unilamellar structure, consisting of an inner layer with an electron-dense outer wall and a low-density layer, and an outer layer with hairlike fibers. The cell wall of C. vulgaris is mainly composed of cellulose, hemicellulose, monosaccharides, lipid, protein, and glycosyl. As a glucosamine-type species, glucosamine is the main constituent of the cell wall of C. vulgaris, and proteins constitute about 20% of the cell wall.