New basic amino acid, named laminine after Laminaria, was discovered from aqueous extracts of Laminaria angustata and its oxalate, m.p. 122-124°, [α]D18+10.8° (H2O), C13H24O10N2⋅1/2H2O, was isolated as colorless needles. From the various findings, the chemical structure of laminine oxalate was regarded to be trimethyl-(5-amino-5-carboxypentyl)-ammonium dioxalate. Besides laminine, L-lysine, L-arginine, ethanolamine and choline isolated have been proved as basic components from L. angustata.
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Takemoto et al. (1964) studied this question.