Extended Frequency Range Depolarized Light Scattering Study of N-Acetyl-leucine-methylamide Water Solutions
Articolo
Data di Pubblicazione:
2011
Abstract:
We have studied the influence of the amphiphilic model
peptide N-acetyl-leucine-methylamide (NALMA) on the dynamics of
water using extended frequency range depolarized light scattering
(EDLS), between 0.3 GHz and 36 THz. This technique allowed us
to separate solute from solvent dynamics and bulk from hydration
water, providing both characteristic times and relative fractions. In the
temperature range 5-65 °C, a retardation factor from 9 to 7 is found for
water hydrating NALMA. Moreover, in the same range, a hydration
number from 62 to 50 is observed, corresponding to more than two
hydration layers. This strong perturbation suggests the existence of a collective effect of amphiphilic molecules on surrounding water
molecules.
peptide N-acetyl-leucine-methylamide (NALMA) on the dynamics of
water using extended frequency range depolarized light scattering
(EDLS), between 0.3 GHz and 36 THz. This technique allowed us
to separate solute from solvent dynamics and bulk from hydration
water, providing both characteristic times and relative fractions. In the
temperature range 5-65 °C, a retardation factor from 9 to 7 is found for
water hydrating NALMA. Moreover, in the same range, a hydration
number from 62 to 50 is observed, corresponding to more than two
hydration layers. This strong perturbation suggests the existence of a collective effect of amphiphilic molecules on surrounding water
molecules.
Tipologia CRIS:
01.01 Articolo in rivista
Elenco autori:
Comez, Lucia
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