Composition of some brown algae as influenced by seasonal variation

An investigation of the effect of seasonal variation on the composition of three brown algae showed that Cystoseira was richer in its mannitol content (10·7%) than Sargassum (6·7%). In all three species, laminarin ranged from 2·24% to 4·42% during most months but was absent in June. Alginic acid content (30–32%) was at its maximum in August for the two Cystoseira species but was high both in April and August in S. linifolium. The uronic acid composition of alginic acid as well as the fucose and galactose contents of the algal species showed definite seasonal variation.