Preparation of the Color Films with Fixed Cholesteric Liquid Crystals

Kosho, Hiroshi; Ise, Hiroshi; Tanaka, Yasuyuki; Kawauchi, Susumu; Watanabe, Junji

doi:10.4011/shikizai1937.72.604

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The technique operates by the differential absorption of the left-and right-handed components of circularly polarized light by chiral molecules in solution. 1 In addition to the chirality of a monomolecule in solution, the chirality of a macromolecule, such as liquid crystals, [2][3][4] and homoassociates of porphyrin 5 were also detected by CD spectra.…”

Section: Introductionmentioning

confidence: 99%

Novel Observation of a Circular Dichroism Band Originating from Amyloid Fibril

Abe

Nakanishi

2003

ANAL. SCI.

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IntroductionCircular dichroism (CD) is one of the most useful physical techniques for determining the structures and monitoring structural changes of peptides, proteins, nucleic acids, and so on. The technique operates by the differential absorption of the left-and right-handed components of circularly polarized light by chiral molecules in solution. 1 In addition to the chirality of a monomolecule in solution, the chirality of a macromolecule, such as liquid crystals, 2-4 and homoassociates of porphyrin 5 were also detected by CD spectra.The far-ultraviolet (far-UV) CD spectra (below 250 nm) of peptides and proteins are extremely sensitive to the secondary structure, and the near-UV spectra reflect the contributions of aromatic side chains, disulfide bonds, and induced CD bands of prosthetic groups.In recent years, several kinds of peptides and proteins, which polymerize and form amyloid fibrils, have been focused on due to their neurotoxicity. 6 A non-amyloid β-component (NAC) is one of the amyloidogenic peptides which have been identified as the second major constituent in the plaques of a brain with Alzheimer's disease. 7 The amyloid formation by peptides and proteins was mainly detected by the far-UV CD spectrum, especially near 218 nm, which indicates the existence of a β-conformation. Until now, near-UV CD studies of amyloid-forming peptides have been confined to the analysis of aromatic residues. 8,9 It has recently been demonstrated that a peptide fragment of NAC (NAC(1-13); EQVTNVGGAVVTG) forms amyloid fibrils. 10With an extension of far-UV CD measurements of NAC(1-13), we studied in detail the near-UV CD spectra and found a novel band. In this paper, the results of CD analyses of NAC(1-13) in the far-UV and near-UV regions are presented and discussed concerning the formation of amyloid fibrils. ExperimentalPeptide synthesis NAC(1-13) was synthesized by the Fmoc strategy using a simultaneous multiple-peptide synthesizer, Model PSSM-8 (Shimadzu Corp., Kyoto, Japan). Each residue was coupled for 30 min with PyBOP/HOBt (Watanabe Chemical Industries, Hiroshima, Japan). The peptide was cleavaged from the Alkoresin (Watanabe Chemical Industries, Hiroshima, Japan) using 5% anisole and 1% 1,2-ethanedithiol in trifluoroacetic acid for 1.5 h at room temperature. The cleaved peptide was washed with diethyl ether and solubilized with 25% acetonitrile in 0.01 N HCl.Crude NAC(1-13) was purified by reverse-phase HPLC using an ODS column (20 mm × 150 mm) heated at 40˚C with a linear gradient of 20 to 25% acetonitrile in an aqueous solution of 0.01N HCl over 10 min at a flow rate of 9.9 ml/min. The molecular weight of the peptide was determined by matrixassisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The (M+H) + value of NAC(1-13) was calculated to be 1231.4 and was found to be 1231.7 experimentally. The peptide purity was found to be greater than 95% by analytical HPLC. Purified peptides were lyophilized and stored at -20˚C until used. Preparation of peptide samplesA sample soluti...

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Section: Introductionmentioning

confidence: 99%

Novel Observation of a Circular Dichroism Band Originating from Amyloid Fibril

Abe

Nakanishi

2003

ANAL. SCI.

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“…By controlling this pitch, various colors can be expressed. 2 As shown in Figure 1, our Ch-LC films show the remarkable property of patterning colors by changing the helical pitch in the plane direction. 3,4 Ch-LCs also have the characteristics that they reflect circularly polarized light of the same sense as the helix of the Ch-LCs and transmit circularly polarized light of the opposite sense.…”

Section: Introductionmentioning

confidence: 82%

“…Cholesteric liquid crystals (Ch‐LCs) exhibit structural colors and have selective reflection characteristics at specific wavelengths corresponding to the helical pitch. By controlling this pitch, various colors can be expressed 2 . As shown in Figure 1, our Ch‐LC films show the remarkable property of patterning colors by changing the helical pitch in the plane direction 3,4 …”

Section: Introductionmentioning

confidence: 93%

Novel cholesteric liquid crystal films creating angle insensitive reflective colors

et al. 2023

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Syntheses and Properties of Cellulosic Derivatives for Reflection Color Films

Fukawa

Kawaguchi

Hayata

et al. 2019

J. Photopol. Sci. Technol.

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This report describes the syntheses and properties of cellulosic derivatives for reflection color films. As hydroxypropyl cellulose (HPC) was reacted with acryloyl chloride, we prepared a series of HPC derivatives tethering acryloyl side chains (HPC-Ac) at their different esterification degrees. When the cell of HPC-Ac was heated in a stepwise manner, we observed thermotropic cholesteric liquid crystal (CLC) feature with Bragg reflection in the full-visible wavelength range. Such temperature dependence of Bragg reflection could be controlled by tuning esterification degree of acryloyl side chains of HPC-Ac. We succeeded in the permanent preservation of periodic helical CLC structure by thermo-or photo-induced crosslinking reaction between the acryloyl side chains of HPC-Ac, resulting in fabrication of reflection color films with thermal stability up to 180 C. This report provides promising clues to fabricate the robust multi-colored films, derived from biomass of cellulose, for novel photonic devices.

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Preparation of the Color Films with Fixed Cholesteric Liquid Crystals

Cited by 4 publications

References 3 publications

Novel Observation of a Circular Dichroism Band Originating from Amyloid Fibril

Novel Observation of a Circular Dichroism Band Originating from Amyloid Fibril

Novel cholesteric liquid crystal films creating angle insensitive reflective colors

Syntheses and Properties of Cellulosic Derivatives for Reflection Color Films

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