Alginate-based Water-soluble Adhesives: Effect of Incorporated Phenolic Hydroxy Groups on Adhesiveness

Abstract Alginic acid (Alg) was modified with tyramine (TA), homoveratrylamine (HVTA) and 2-phenylethylamine (PA) to obtain Alg-based adhesives, AlgTA, AlgHVTA and AlgPA. The adhesiveness of the modified Algs were evaluated and compared with previously reported catechol-modified alginate, AlgDA. AlgTA showed adhesion tendency differently from AlgDA, depending on the incorporation ratios of TA. AlgHVTA with protected phenolic hydroxy groups showed lower adhesiveness than AlgDA for mica surface, but higher for polymethyl methacrylate surface. AlgPA without phenolic hydroxy group also exhibited moderate adhesiveness for mica.