in aqueous and alcoholic media ( ph 6-7 ) the largest shift of the absorption maximum in the presence of non-esterified cholesterol was observed in the compounds containing guanidinio groups ( guanidine , metformine , arginine , polyarginine ) and , in a lesser degree , the compounds containing epsilon-amino groups ( lysine , polylysine ) .
C0024337
lysine
C0032518
polylysine