Table 1.

Estimation of the number of backbone carbonyls involved in H-bond in antiparallel β-sheet conformation

Derivative	[Pep] w/w	Number of peaks	% Area at 1625 cm−1	% Area at 1685 cm−1	Total % area	Estimated number of carbonyls	r2
Cys-Ala	10%	5	73	14	87	7	0.998
Lan-β-M	10%	4	73	9	82	7	0.997

This estimation was done on the spectra recorded for the highest concentration of peptide to reduce the contribution of the unstructured spectra arising from nonassembled peptides. The decomposition was performed using simple Gaussian curves (see Fig. 2).