2012
DOI: 10.1021/bm3005929
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Investigations of the Supramolecular Structure of Individual Diphenylalanine Nano- and Microtubes by Polarized Raman Microspectroscopy

Abstract: Polarized Raman microspectroscopy and atomic force microscopy were used to obtain quantitative information regarding the molecular structure of individual diphenylalanine (FF) nano- and microtubes. The frequencies of the Raman spectral bands corresponding to the amide I (1690 cm(-1)) and amide III (1249 cm(-1)) indicated that the FF-molecules interact by hydrogen bonding at the N-H and not at the C═O sites. The calculated mean orientation angles of the principal axes of the Raman tensors (PARTs) obtained from … Show more

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Cited by 41 publications
(79 citation statements)
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“…The first one includes a few peaks, which do not change substantially during the observed phase transition. In agreement with other published works, [44][45][46] this group contains the major aromatic ring peak (1000 cm À1 ), the phenyl group bands (1030 cm À1 , 1188 cm ) and the 1249 cm À1 peak, which is attributed to the amide III vibrations. These spectral lines remain at approximately the same frequency position and preserve their intensity during the entire temperature-induced cyclization process, ending by the formation of the nanofiber structure.…”
Section: Csupporting
confidence: 92%
See 1 more Smart Citation
“…The first one includes a few peaks, which do not change substantially during the observed phase transition. In agreement with other published works, [44][45][46] this group contains the major aromatic ring peak (1000 cm À1 ), the phenyl group bands (1030 cm À1 , 1188 cm ) and the 1249 cm À1 peak, which is attributed to the amide III vibrations. These spectral lines remain at approximately the same frequency position and preserve their intensity during the entire temperature-induced cyclization process, ending by the formation of the nanofiber structure.…”
Section: Csupporting
confidence: 92%
“…[42] Hexagonal-shaped FF-based PNT are composed of hollow tubular nanochannels (formed by six stacked FF molecules), with water molecules filling the inside of the channels. [43,44] Each linear FF (H 2 N-Phe-Phe-COOH) molecule has two hydrophobic aromatic rings in the side chains between the amino and the carboxylic ends. [43] We expect to identify, with Raman spectroscopy, the aromatic ring bond and the amide bonds C=O, CÀN, OÀH, NÀH, and CÀH (depending on the frequency region).…”
Section: Cmentioning
confidence: 99%
“…Using data analysis techniques that will be discussed in Section 5, Raman spectroscopy has been used to classify bacteria [14,15], nano-bio-materials [138][139][140], cells [141,142], and animal and human tissues [143,144]. Because Raman spectroscopy is non-labeling and non-destructive, repeated measurements can be made of the same sample.…”
Section: Applicationsmentioning
confidence: 99%
“…Lekprasert et al used polarized Raman spectroscopy in combination with atomic force microscopy to study diphenylalanine nano-and micro-tube [138]. The authors were able to determine the orientation of molecules within the structure [139] and show that the structure remained constant when force was applied using an atomic force microscope [140].…”
Section: Polarized Raman Spectroscopymentioning
confidence: 99%
“…14,16,17 The polarization dependence of the amide III band is noticeable in Fig. 3 as the intensity in the XX configuration is higher than in the ZZ configuration, indicating that the principal axis of the Raman tensor of the amide III vibration is oriented perpendicular to the axis of the nanotubes (the first index denotes the laser polarization and the second index represents the direction of the analyzer, while the excitation laser and the Raman back-scattered radiation propagated in the Y direction).…”
mentioning
confidence: 99%