A construct of the structure F—S1-S2 where: F—S1 is an aminoalkylglycoside where F is α-D-galactopyranosyl-(1→4)-β-D-galactopyranosyl-(1→4)-β-D-glucopyranoside and S1 is 2-aminoethyl, 3-aminopropyl, 4-aminobutyl or 5-aminopentyl; S2 is —CO(CH2)2CO—, —CO(CH2)3CO—, —CO(CH2)4CO— or —CO(CH2)5CO—; and L is phosphatidylethanolamine.