Several carbohydrates of low molecular weight were isolated from the fronds of
Serraticardia maxima, a calcareous red alga, using mainly carbon-Celite column and cellulose column chromatography. They were crystallized and identified by various physical and chemical methods as floridoside, α, α-trehalose, and laminitol; their contents being 0.9%, 0.4% and 0.1% on a dry weight basis, respectively. Furthermore, maltose,
isofloridoside, mannitol and other several unknown substances were detected by paper chromatography in the ethanolic extracts from this alga. On the contrary, sugars such as glucose, fructose and sucrose, which are widely distributed in green algae as well as in higher plants, could not be found.
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