Present status of vacuum ultraviolet natural circular dichroism measurement system using polarizing undulator at TERAS BL5 beamline

Tanaka, Masahito; Yagi-Watanabe, Kazutoshi; Kaneko, Fusae; Nakagawa, Kazumichi

doi:10.1016/j.elspec.2010.04.001

Cited by 4 publications

(8 citation statements)

References 25 publications

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“…The obtained absorption spectra of the aliphatic amino acids films are shown in Figure . The absorption spectra of Ala, Val, and Leu have already been presented in our previous reports. , Inagaki has also reported the absorption spectra of the aliphatic amino acids films without the absorption coefficients, that is, only given in units of OD, and our results are the good agreement in his results in shape.…”

Section: Resultssupporting

confidence: 85%

“…Figure shows the CD spectra of the aliphatic amino acids films in the VUV region. The CD spectra of Ala, Val, and Leu have also already been reported in our previous work, , and that of Abu has been recently reported by Meierhenrich et al There are clear difference, as well as similarities, among the CD spectra of the aliphatic amino acids. The obtained CD intensities are summarized in Table .…”

Section: Resultssupporting

confidence: 84%

“…In the CD spectrum of Ala in the EUV region, a strong negative CD peak f was found at 10.2 eV. 35,36 As shown in Figure 3, our preliminary theoretical CD calculation roughly predicted the experimental results. The calculated CD spectra were blue-shifted by 0.6-0.7 eV to adjust the clear positive CD peaks with respect to the experimental CD peaks b.…”

Section: Resultssupporting

confidence: 69%

“…Abu exhibits negative CD peaks ( f ) at 9.5 eV, and the other amino acids also show negative CD bands at around 9−10 eV. In the CD spectrum of Ala in the EUV region, a strong negative CD peak f was found at 10.2 eV. , …”

Section: Resultsmentioning

confidence: 99%

“…In addition, amino acids are key molecules in studying the origin of biomolecular homochirality, as well as being the building blocks of proteins. As a result, a large number of experimental and theoretical studies of the optical properties of amino acids in solution and in the solid state have been reported. ,,– ,– Recently, we have developed a system for CD measurements in the VUV, and even the extreme ultraviolet (EUV) regions, using the polarizing undulator at the beamline BL5 at TERAS, Japan as a polarized light source. – This CD system has also been successfully used to measure the CD spectra of some amino acids films in the VUV region , and to observe CD spectra in the EUV region up to 30 eV for the first time. , …”

Section: Introductionmentioning

confidence: 99%

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Chiroptical Study of α-Aliphatic Amino Acid Films in the Vacuum Ultraviolet Region

et al. 2010

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A series of natural circular dichroism (CD) and absorption spectra for films of α-aliphatic amino acids--such as alanine, aminobutyric acid, norvaline, norleucine, valine, leucine, and isoleucine--in the vacuum ultraviolet (VUV) region were observed with the absolute values of optical constants at the undulator-based CD beamline TERAS BL5. Preliminary predictions of some CD spectra were also performed, based on quantum-chemical calculations using the crystal structure. Although the absorption spectra show similar features to each other, significant differences between the CD spectra were found, especially in the 7-8 eV region. The CD spectra of aliphatic amino acids with branched alkyl groups in the side-chain--such as valine, leucine, and isoleucine--exhibit strong negative CD peaks in this energy region. In contrast, the corresponding CD peaks were weak or absent in the spectra of amino acids with straight alkyl groups. Our simple calculation, and the absorption spectra of alkanes, suggest that this difference partly originates from the contribution of the alkyl group. Clear discrepancies between the CD spectra of these amino acids in solutions and those in the solid state were also observed; this is probably caused by the different molecular structures in each state. Our results clearly indicated that CD spectra in the VUV region were very sensitive to the conformations of chiral molecules.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chiroptical Study of α-Aliphatic Amino Acid Films in the Vacuum Ultraviolet Region

et al. 2010

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Enantiomeric Excesses of Aminonitrile Precursors Determine the Homochirality of Amino Acids

Kitazawa

Sato

Watanabe

et al. 2023

J. Phys. Chem. Lett.

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High enantiomeric excesses (ee's) of L-amino acids, including nonproteinogenic amino acid isovaline (Iva), were discovered in the Murchison meteorite, but the detailed molecular mechanism responsible for the observed ee of amino acids remains elusive and inconsistent, because Iva has an inverted circular dichroism (CD) spectrum with respect to α-H amino acids, e.g., alanine. To address this issue, we resort to accurate ab initio calculations for amino acids and their precursors in the Strecker synthesis. We evaluated their photolysis-induced ee in the range 5−11 eV including the Lyman alpha emission line (Lyα), the typical intensive 10.2 eV radiation ascribed to the early phase of galactic evolution. We show that only the aminonitrile precursors are characterized by positive ee in the Lyα region, explaining why right-handed circularly polarized Lyα (R-CP-Lyα) induces homologous L-amino acids. This study shows that the homochirality of amino acids is produced at the aminonitrile precursors stage.

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Characteristic oxygen K-edge circular dichroism spectra of amino acid films by improved measurement technique

Izumi

Tanabe

Imazu

et al. 2013

The Journal of Chemical Physics

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Circular dichroism (CD) spectroscopy in the soft x-ray energy region is a new tool to study the local structure of chiral materials. In this paper, we introduce a method to measure high-quality CD spectra in the oxygen K-edge energy region. Characteristic CD spectra of thin films of the amino acids L-tyrosine and L-aspartic acid are reported and compared with those of films of L-alanine and L-serine. The signals from the oxygen 1s → π∗ transitions of COO-, which is a common moiety in these amino acids, reflect the local geometry of each amino acid.

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Present status of vacuum ultraviolet natural circular dichroism measurement system using polarizing undulator at TERAS BL5 beamline

Cited by 4 publications

References 25 publications

Chiroptical Study of α-Aliphatic Amino Acid Films in the Vacuum Ultraviolet Region

Chiroptical Study of α-Aliphatic Amino Acid Films in the Vacuum Ultraviolet Region

Enantiomeric Excesses of Aminonitrile Precursors Determine the Homochirality of Amino Acids

Characteristic oxygen K-edge circular dichroism spectra of amino acid films by improved measurement technique

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