Infrared study of the effect of hydration on the amide I band and aggregation properties of helical peptides

Article Abstract:

A study is conducted to find how the degrees of hydration might affect the amide I' vibrational transitions of two alanine-based helical peptides and how it affects their aggregation behaviors. The results show that the dehydrated helical amide groups give rise to an amide I' band centered around approximately 1650 [cm.sup.-1], whereas hydration shifts this band toward lower frequencies.

Hydration (Chemistry)

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On the temperature dependence of amide I frequencies of peptides in solution

Article Abstract:

The temperature dependence of the amide I vibrational frequencies of peptides in solution are examined. The poor predictions of the model for the N-methyl acetamide (NMA) amide I band in [D.sub2]O is due to the unknown temperature dependence of the refractive index of [D.sub.2]O in the mid-IR range, which is approximated by the available values in the visible region.

Methyl groups, Methyl compounds

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Heterogeneous and anomalous diffusion inside lipid tubules

Article Abstract:

The studies of the diffusion rates of several molecules encapsulated in lipid tubules formed by 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine (D[C.sub.8.9]PC) is reported. The results indicate that the mobility of the molecules depends on their position in the (D[C.sub.8.9]PC) tubules and their concentrations.

Lipids, Optical properties, Bleaching, Diffusion, Diffusion (Physics), Structure

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