Notizen: Marginalin, a Substance from the Pygidial Glands of Dytiscus Marginalis (Coleoptera): Molecular Associations with Polyamines in vitro

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Abstract
Marginalin, a product previously isolated from the pygidial glands of the water-beetle Dytiscus marginalis (Coleoptera), strongly reacts in vitro to form complexes with polyamines of biological interest. With spermin and spermidin, this interaction is specific giving 1:1 complexes which were isolated and studied (physico-chemical data). The results so far observed are discussed in relationship with the known biological properties of spermin and spermidin and the significance of marginalin in the defensive secretion of the beetle.