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crc press - E-Lib FK UWKS

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174 Cell-Penetrating Peptides: Processes and Applications<br />

FIGURE 8.4 Variations of the FTIR spectra in the amide I and II bands region of mixed<br />

lipid- 1 multilayers as a function of the peptide molar fractions. The lipids are DOPG (A) and<br />

DPPG (B). The band centered around 1740 cm –1 corresponds to the lipidic carbonyls. (Adapted<br />

from Vié, V. et al., Biophys. J., 78, 846, 2000. With permission.)<br />

q = 3, respectively. This is a good indication that a phase separation occurs for x p =<br />

0.08. This behavior, together with the fact that an excess of peptide or of lipid<br />

generates low surface <strong>press</strong>ures, suggests that lipid–lipid and peptide–peptide interactions<br />

are lower than lipid–peptide interactions.<br />

(a)<br />

(b)

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