Table 2. Secondary structure content of aS dimers fibrils as determined by FTIR spectroscopy reported in Fig. 6 and in Fig. S5.

Wavenumber a (cm−1)	Structural Assignment	aS % b	NN % b	CC % b	NC % b	DC % b
1560–1568	Glu (COO−)	23	33	48	3	8
1580–1586	Asp (COO−)	5	-	-	3	4
1612–1619	Aggregated β-sheet	31	18	13	32	46
1634–1636	β-sheet	18	-	18	-	-
1640–1650	Random	-	33	11	38	16
1656–1668	Turns	19	15	9	22	24
1680–1689	Anti-parallel aggregated β-sheet	4	1	1	2	2

^aPeak position of the amide I band components, as deduced by the second derivative spectra.

^bPercentage area of the amide I band components, as obtained by integrating the area under each deconvoluted band. The areas corresponding to side chain contributions located at 1700–1710 cm⁻¹ have not been considered.