Nondestructive Raman and atomic force microscopy measurement of molecular structure for individual diphenylalanine nanotubes

Lekprasert, Banyat; Sedman, Victoria L.; Roberts, Clive J.; Tedler, Saul J. B.; Notingher, Ioan

doi:10.1364/ol.35.004193

Cited by 16 publications

(21 citation statements)

References 19 publications

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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%

Symmetry of Bioinspired Short Peptide Nanostructures and Their Basic Physical Properties

Handelman

Shalev

Rosenman

2015

Israel Journal of Chemistry

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A novel technique was developed for preparing encoded multicolour microparticles based on the self‐assembly of bacteria and conjugated polymer nanoparticles (CPNs) by a very simple and time‐saving manner. These bacteria–CPNs microparticles show multicolor emissions by tuning FRET efficiencies among CPNs under single excitation wavelength and can be successfully applied for cell imaging and optical barcoding.

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Section: Csupporting

confidence: 92%

Symmetry of Bioinspired Short Peptide Nanostructures and Their Basic Physical Properties

Handelman

Shalev

Rosenman

2015

Israel Journal of Chemistry

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“…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%

Raman spectroscopy: techniques and applications in the life sciences

Shipp¹,

Sinjab²,

Notingher³

2017

Adv. Opt. Photon.

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254

189

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Raman spectroscopy is an increasingly popular technique in many areas including biology and medicine.It is based on Raman scattering, a phenomenon in which incident photons lose or gain energy via interactions with vibrating molecules in a sample. These energy shifts can be used to obtain information regarding molecular composition of the sample with very high accuracy. Applications of Raman spectroscopy in the life sciences have included quantification of biomolecules, hyperspectral molecular imaging of cells and tissue, medical diagnosis, and others. This review briefly presents the physical origin of Raman scattering explaining the key classical and quantum mechanical concepts. Variations of the Raman effect will also be considered, including resonance, coherent, and enhanced Raman scattering. We discuss the molecular origins of prominent bands often found in the Raman spectra of biological samples. Finally, we examine several variations of Raman spectroscopy techniques in practice, looking at their applications, strengths, and challenges. This review is intended to be a starting resource for scientists new to Raman spectroscopy, providing theoretical background and practical examples as the foundation for further study and exploration.

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“…Up to now, the phase transitions in FF nanotubes were investigated by scanning and transmission electron microscopy, atomic force microscopy, differential scanning calorimetry, thermogravimetry, mass spectroscopy etc. However, the details of these transformations at the microscopic level can be revealed by the Raman spectroscopy, which is a powerful supplementary tool for indirect studying the structure and the conformation of molecular species, and which was implemented before at room temperature only . Recently, different behavior of several Raman lines at elevated temperatures was demonstrated, but the details of the phase transformations were not discussed.…”

Section: Introductionmentioning

confidence: 99%

Raman study of structural transformations in self‐assembled diphenylalanine nanotubes at elevated temperatures

Zelenovskiy

Davydov

Крылов

et al. 2017

J Raman Spectroscopy

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Self‐assembled peptide diphenylalanine (NH2‐Phe‐Phe‐COOH, FF) is one of the most important emergent functional materials, demonstrating wide range of fascinating physical and chemical properties including biocompatibility, chemical variability, exceptional rigidity, outstanding piezoelectric, pyroelectric and ferroelectric responses. Up to now, the phase transitions in FF nanotubes were investigated by scanning and transmission electron microscopy, atomic force microscopy, differential scanning calorimetry, thermogravimetry and mass spectroscopy. The Raman spectroscopy was implemented at room temperature only, and the microscopic details of these transitions remained unknown. In this work, the structural transformations in FF nanotubes at elevated temperatures (up to tubes destruction at 160 °C) were studied by Raman spectroscopy. Two structural transformations were observed in this region: hexagonal to orthorhombic transition at about 100 °C and the cyclization of FF molecules at about 150 °C. For the first time, these transformations were considered in the context of reconstruction of the water subsystem in the nanotubes, thus demonstrating the strong relation between the peptide tube and the state of the water inside. Using an effective frequency of nanotubes' lattice vibrations, we found that many effects observed earlier by other methods are induced by the variation of the water subsystem. The analysis of certain lines in the middle part of the Raman spectrum allowed us to describe the microscopic details of FF molecule cyclization. These results improve the understanding of the role of water in the origin of outstanding properties of FF nanotubes and thus promote developing new functional devices on their basis. Copyright © 2017 John Wiley & Sons, Ltd.

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Nondestructive Raman and atomic force microscopy measurement of molecular structure for individual diphenylalanine nanotubes

Cited by 16 publications

References 19 publications

Symmetry of Bioinspired Short Peptide Nanostructures and Their Basic Physical Properties

Symmetry of Bioinspired Short Peptide Nanostructures and Their Basic Physical Properties

Raman spectroscopy: techniques and applications in the life sciences

Raman study of structural transformations in self‐assembled diphenylalanine nanotubes at elevated temperatures

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