The focus of this paper is on the surface interaction between the biogenic amines and the anionic surfactant sodium dodecyl sulphate, SDS. Although this focus is rather specific, how the surface
interaction is affected by the structure and molecular weight,MW, of the polyamine has much broader biological and technological significance and implications. In this broader context the
poly(ethyleneimine), PEI, based polymers and the polyamines are important polyelectrolytes because of their widespread applica