List of all the samples prepared for this study and their molecular composition.

The anionic lipid matrix was formed by a mixture of saturated DMPC and charged DMPS lipid molecules. The full length amyloid- peptide and the amyloid- segment were added at a concentration of 3 mol%. 30 mol% cholesterol and melatonin were added (separately) to study the interactions of these molecules with A peptides. denotes the position of the acyl chain correlation peak. is the corresponding hydrocarbon tail spacing. refers to the lamellar spacing, i.e., the distance between two neighboring membranes in the membrane stacks. The area per lipid for the gel state samples was determined from . Lipid areas in the fluid state can not be determined using this technique; therefore, we used a lipid area of 60.6 Å, as reported by Kučerka et al.[79] for fluid DMPC membranes.