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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

Berezhinsky, L. I., G. I. Dovbeshko, M. P. Lisitsa та G. S. Litvinov. "Vibrational spectra of crystalline β-alanine". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 54, № 2 (лютий 1998): 349–58. http://dx.doi.org/10.1016/s1386-1425(97)00233-3.

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2

Liu, Jun, Feng-shan Zhou, Ran Guo, Ye Jiang, Xiaokun Fan, Anqi He, Yanjun Zhai, et al. "Analysis of an Alanine/Arginine Mixture by Using TLC/FTIR Technique." Journal of Spectroscopy 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/925705.

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Анотація:

We applied TLC/FTIR coupled with mapping technique to analyze an alanine/arginine mixture. Narrow band TLC plates prepared by using AgI as a stationary phase were used to separate alanine and arginine. The distribution of alanine and arginine spots was manifested by a 3D chromatogram. Alanine and arginine can be successfully separated by the narrow band TLC plate. In addition, the FTIR spectra of the separated alanine and arginine spots on the narrow band TLC plate are roughly the same as the corresponding reference IR spectra.

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3

Dagnelie, P. C., D. K. Menon, I. J. Cox, J. D. Bell, J. Sargentoni, G. A. Coutts, J. Urenjak, and R. A. Iles. "Effect of l-alanine infusion on 31P nuclear magnetic resonance spectra of normal human liver: towards biochemical pathology in vivo." Clinical Science 83, no. 2 (August 1, 1992): 183–90. http://dx.doi.org/10.1042/cs0830183.

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1. 31P n.m.r. spectroscopy in vivo was used to study the effect of l-alanine infusion on the concentrations of gluconeogenic intermediates in normal human liver. Studies were performed in six healthy male subjects (34–44 years, fasted overnight) using a chemical shift imaging pulse sequence on a whole-body n.m.r. system operating at 1.6T. Hepatic 31P n.m.r. spectra were obtained from 10 min before to 70 min after intravenous administration of 0.70 (n = 2), 1.40 (n = 3) or 2.80 (n = 5) nmol of l-alanine/kg body weight over 4.5 min. Concentrations of phosphomonoesters, Pi and phosphodiesters relative to ATP were calculated from peak areas in the n.m.r. spectra, using the β-ATP peak as a reference. 2. Dose-dependent spectral changes were observed for [phosphomonoesters]/[ATP] and [Pi]/[ATP]. At the highest dose given, maximal changes in [phosphomonoesters]/[ATP] (mean ± sem: 98 ± 12%, P<0.005) and [Pi]/[ATP] (−33 ± 3%, P<0.001) were observed approximately 45 min after the l-alanine infusion. [Phosphodiesters]/[ATP] showed a maximal increase of 24 ± 6% (P<0.05), which was independent of the l-alanine dose. Hepatic ATP levels and pH did not change. 3. To identify the metabolites responsible for the changes observed in vivo, male Wistar rats were infused with 11.2 mmol of l-alanine/kg body weight. After 15 min, livers were freeze-clamped and were extracted according to standard procedures. In vitro, 31P n.m.r. spectra obtained at 8.4 or 11.7 T revealed sharp increases in the concentrations of 3-phosphoglycerate and phosphoenolpyruvate after l-alanine infusion. No significant increases in other metabolites contributing to the phosphomonoester or phosphodiester resonances in vivo were observed, suggesting that the rise in [phosphomonoesters] observed in vivo was caused by increasing concentrations of 3-phosphoglycerate, and that phosphoenolpyruvate contributed to the rise in [phosphodiesters]. 5. These results show that l-alanine infusion leads to consistent changes in the 31P n.m.r. spectra of the human liver owing to increased concentrations of gluconeogenic intermediates. The ‘n.m.r.-alanine test’ may constitute a useful tool for studies of gluconeogenesis and hepatic biochemical pathology in vivo.

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4

Ermawati, Frida U. "SOPHE Computation on Alanine Single Crystal EPR Spectra." Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 1, no. 1 (June 14, 2011): 23. http://dx.doi.org/10.26740/jpfa.v1n1.p23-32.

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Simulation of X-band first-derivative continuous-wave electron paramagnetic resonance (CW-EPR) experimental spectra of g-irradiated ℓ-α-alanine single crystal has been carried out. The aim was to confirm the existence of radical induced by irradiation in the system. A SOPHE computer simulation software suite (v. 1.1.3) was utilized for that purpose. Six different X-band spectra measured from a number of defined crystal orientations to the external magnetic field B were recorded and simulated. The “axial” spectra (refer to the simulated spectra when the external B field was parallel to the crystal axes and that was measured at room temperature) confirm the simultaneous presence of the SAR, R2 and R3 radicals with the appropriate proportions. The “planar” spectra (refer to the simulated spectra when the B field was on the crystal planes), however, do not exactly fit to the experimental spectra. Together with the simulation outcomes, the problems that appear during the work, as well as the solutions proposed to overcome those problems are discussed.

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5

Brym, Szczepan. "Comparison IR spectra of alanine CH3CH(NH2)COOH and alanine CD3CH(NH2)COOH." Journal of Physics: Conference Series 810 (February 2017): 012026. http://dx.doi.org/10.1088/1742-6596/810/1/012026.

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6

Bell, Jimmy D., Judith C. C. Brown, Peter J. Sadler, Andrew F. MacLeod, Peter H. Sönksen, Robin D. Hughes, and Roger Williams. "High resolution proton nuclear magnetic resonance studies of human cerebrospinal fluid." Clinical Science 72, no. 5 (May 1, 1987): 563–70. http://dx.doi.org/10.1042/cs0720563.

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Анотація:

1. One- and two-dimensional (correlated shift spectroscopy) high resolution proton n.m.r. spectra of human cerebrospinal fluid (CSF) are reported. The merits of water suppression by freeze drying or irradiation, and spectral simplification by spin-echo methods, are discussed. 2. Well-resolved resonances for a range of low molecular weight metabolites such as lactate, 3-d-hydroxybutyrate, alanine, acetate, citrate, glucose, valine and formate were observed. Resonances for glutamine were observed only from freeze dried samples. Concentrations determined by n.m.r. were in reasonable agreement with those from conventional methods. 3. The n.m.r. spectra of CSF were related to the clinical conditions of the subjects. No resonances for citrate were present in spectra of CSF from subjects (three infants) with bacterial meningitis; high lactate and lowered glucose levels were observed. Strong resonances for glucose and glycine were observed for mildly diabetic subjects. Both the aromatic and the aliphatic regions of the CSF spectra from subjects suffering from liver failure contained distinctive features characteristic for hepatic coma: intense resonances for lactate, alanine, valine, methionine, tyrosine, phenylalanine and histidine. In some cases guanine was also present, which does not appear to have been reported previously. The two-dimensional spectrum suggested the presence of abnormally high levels of a number of endogenous metabolites. Such assignments were not possible using one-dimensional spectra alone because of signal overlap.

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7

Gou, Gao Zhang, Bo Zhou, Ling Shi, Xian Lan Chen, Na Wu та Wei Liu. "Synthesis, Spectroscopic Properties of Bis-Boc-L-Alanine Modiﬁed 1,8-Naphthyridine Ligand Induced by Hg²⁺". Advanced Materials Research 1089 (січень 2015): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.1089.121.

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One Bis-Boc-L-alanine-1,8-naphthyridine ligand containing amino acid by amido bond named 2,7-Bis-Boc-L-alanine-1,8-naphthyridine (L1) was synthesized and characterized. And there absorption and fluorescence spectra in methanol is presented. It exhibits electronic absorption spectra with λmax at about 340 nm, which can be tentatively assigned to π→π* transition. The emission spectra of L1 in CH3OH shows a mirror symmetry peak with λmax at about 375 nm. Then, the comprehensive study of spectroscopic properties upon titration of L1 with heavy metal ions as ion source in CH3OH was investigated.

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8

Belo, E. A., J. A. Lima, P. T. C. Freire, F. E. A. Melo, J. Mendes Filho, H. N. Bordallo, and A. Polian. "High-pressure Raman spectra of racemate dl-alanine crystals." Vibrational Spectroscopy 54, no. 2 (November 2010): 107–11. http://dx.doi.org/10.1016/j.vibspec.2010.03.016.

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9

Gonçalves, R. O., P. T. C. Freire, H. N. Bordallo, J. A. Lima, F. E. A. Melo, J. Mendes Filho, D. N. Argyriou, and R. J. C. Lima. "High-pressure Raman spectra of deuterated L-alanine crystal." Journal of Raman Spectroscopy 40, no. 8 (August 2009): 958–63. http://dx.doi.org/10.1002/jrs.2209.

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10

Lima, J. A., P. T. C. Freire, F. E. A. Melo, J. Mendes Filho, G. P. De Sousa, R. J. C. Lima, P. F. Façanha Filho, and H. N. Bordallo. "Low-temperature Raman spectra of racemate DL -Alanine crystals." Journal of Raman Spectroscopy 41, no. 7 (October 12, 2009): 808–13. http://dx.doi.org/10.1002/jrs.2507.

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11

Sobolevsky, Tim G., Alexander I. Revelsky, Igor A. Revelsky, Barbara Miller, and Vincent Oriedo. "Electron Ionization Mass Spectra of N(O,S)-Isobutoxycarbonyl Isobutyl Esters of Amino Acids." European Journal of Mass Spectrometry 8, no. 6 (December 2002): 447–49. http://dx.doi.org/10.1255/ejms.522.

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Анотація:

Mass spectra of N(O,S)-isobutoxycarbonyl isobutyl esters of 17 amino acids (L-alanine, glycine, L-valine, L-norvaline, L-leucine, L-isoleucine, L-norleucine, L-proline, L-asparagine, L-methionine, L-threonine, L-serine, L-phenylalanine, L-lysine, L-tryptophan, L-tyrosine and L-cystine) were obtained in the electron ionization mode. These derivatives were found suitable for the analysis of amino acids in aqueous media allowing proper identification and quantitation from the mass spectral characteristics.

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12

Furuta, Masakazu, Tomotsumi Fujisawa, Hiroyasu Urago, Takahiro Eguchi, Takahito Shingae, Satoshi Takahashi, Ewan W. Blanch, and Masashi Unno. "Raman optical activity of tetra-alanine in the poly(l-proline) II type peptide conformation." Physical Chemistry Chemical Physics 19, no. 3 (2017): 2078–86. http://dx.doi.org/10.1039/c6cp07828a.

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13

Chatterjee, Amarnath, Ashutosh Kumar, and Ramakrishna V. Hosur. "Alanine check points in HNN and HN(C)N spectra." Journal of Magnetic Resonance 181, no. 1 (July 2006): 21–28. http://dx.doi.org/10.1016/j.jmr.2006.03.009.

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14

Joe, I. Hubert, Daizy Philip, G. Aruldhas та I. L. Botto. "Raman and IR spectra of β-alanine and sarcosine monophosphates". Journal of Raman Spectroscopy 22, № 7 (липень 1991): 423–25. http://dx.doi.org/10.1002/jrs.1250220712.

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15

Ivanov, A. A., E. V. Korolik, N. I. Insarova, R. G. Zhbankov, and V. P. Golubovich. "Low-temperature vibrational spectra and molecular structure of L-alanine." Journal of Applied Spectroscopy 53, no. 2 (August 1990): 856–60. http://dx.doi.org/10.1007/bf00659399.

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16

MITRA, ALOK K., IOSIF OSTASHEVSKY, and CURTIS F. BREWER. "Synthesis and 19F spectra of tetra-L-alanine analogs containing selectively incorporated 3-fluoro-l-alanine residues." International Journal of Peptide and Protein Research 22, no. 4 (January 12, 2009): 495–501. http://dx.doi.org/10.1111/j.1399-3011.1983.tb02120.x.

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17

Cao, Xiaolin, and Gad Fischer. "Infrared spectra of monomeric l-alanine and l-alanine-N-d3 zwitterions isolated in a KBr matrix." Chemical Physics 255, no. 2-3 (May 2000): 195–204. http://dx.doi.org/10.1016/s0301-0104(00)00082-3.

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18

Tumanov, N. A., E. V. Boldyreva, B. A. Kolesov, A. V. Kurnosov, and R. Quesada Cabrera. "Pressure-induced phase transitions in L-alanine, revisited." Acta Crystallographica Section B Structural Science 66, no. 4 (July 12, 2010): 458–71. http://dx.doi.org/10.1107/s010876811001983x.

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The effect of pressure on L-alanine has been studied by X-ray powder diffraction (up to 12.3 GPa), single-crystal X-ray diffraction, Raman spectroscopy and optical microscopy (up to ∼ 6 GPa). No structural phase transitions have been observed. At ∼ 2 GPa the cell parameters a and b become accidentally equal to each other, but without a change in space-group symmetry. Neither of two transitions reported by others (to a tetragonal phase at ∼ 2 GPa and to a monoclinic phase at ∼ 9 GPa) was observed. The changes in cell parameters were continuous up to the highest measured pressures and the cells remained orthorhombic. Some important changes in the intermolecular interactions occur, which also manifest themselves in the Raman spectra. Two new orthorhombic phases could be crystallized from a MeOH/EtOH/H2O pressure-transmitting mixture in the pressure range 0.8–4.7 GPa, but only if the sample was kept at these pressures for at least 1–2 d. The new phases converted back to L-alanine on decompression. Judging from the Raman spectra and cell parameters, the new phases are most probably not L-alanine but its solvates.

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19

McKnight, Tracy R., Hikari A. I. Yoshihara, Lungile J. Sitole, Jeffery N. Martin, Francois Steffens, and Debra Meyer. "A combined chemometric and quantitative NMR analysis of HIV/AIDS serum discloses metabolic alterations associated with disease status." Mol. BioSyst. 10, no. 11 (2014): 2889–97. http://dx.doi.org/10.1039/c4mb00347k.

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20

Ghazaryan, V. V., M. Fleck, and A. M. Petrosyan. "Structure and vibrational spectra of l-alanine l-alaninium picrate monohydrate." Journal of Molecular Structure 1015 (May 2012): 51–55. http://dx.doi.org/10.1016/j.molstruc.2012.02.007.

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21

Dobrowolski, Jan Cz, Joanna E. Rode та Joanna Sadlej. "Ab initio simulations of the NMR spectra of β-alanine conformers". Computational and Theoretical Chemistry 964, № 1-3 (березень 2011): 148–54. http://dx.doi.org/10.1016/j.comptc.2010.12.013.

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22

Corbeil, Marie-Claude, and Andr� L. Beauchamp. "Crystal structure and vibrational spectra of the methylmercury complex withl-alanine." Journal of Crystallographic and Spectroscopic Research 19, no. 1 (February 1989): 123–34. http://dx.doi.org/10.1007/bf01160849.

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23

Qingde, Su, Yang Yuetao, Mao Qinglu, and Zhao Guiwen. "Photoacoustic Spectra of Complexes of Neodymium(III) with Glyceine and Alanine." Spectroscopy Letters 29, no. 4 (June 1996): 539–48. http://dx.doi.org/10.1080/00387019608007050.

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24

Kumar, R., A. K. Sharma, S. D. S. Chauhan, D. Kulshreshtha, R. Gupta, P. K. S. Chauhan, and O. P. Singh. "Ab initio study of vibrational spectra of alanine in gas phase." Material Science Research India 6, no. 2 (December 25, 2012): 551–58. http://dx.doi.org/10.13005/msri/060237.

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25

Qingde, Su, Yang Yuetao, and Zhao Guiwen. "Photoacoustic Spectra of Complexes of Erbium (III) with Glycine and Alanine." Crystal Research and Technology 31, no. 4 (1996): 475–80. http://dx.doi.org/10.1002/crat.2170310411.

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26

NYEO, SU-LONG, and I.-CHING YANG. "CODON DISTRIBUTIONS IN DNA SEQUENCE OF ESCHERICHIA COLI." Journal of Biological Systems 10, no. 01 (March 2002): 47–60. http://dx.doi.org/10.1142/s0218339002000299.

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The distributions of codons in the DNA sequence of Escherichia coli K-12 are studied by using several statistical methods of analysis. Codons corresponding to the amino acids leucine, alanine and isoleucine are considered. The pair distributions of the codons as a function of the pair separation are evaluated and are seen to decay exponentially. The exponential decay constants have a linear relation with the numbers of the codons, indicating that the codons are randomly distributed in the sequence. The pair correlation and power spectral methods also show similar statistical behavior of codons in the sequence, with the exception that there appear very small peaks about the frequency f=0.286 in the power spectra of the amino acids leucine, alanine and isoleucine. Such a frequency reflects a periodicity of about 3.5 amino acids and a general helical structure of the proteins of the bacterium.

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27

Gou, Gao Zhang, Bo Zhou, Ling Shi, Na Wu, Xian Lan Chen, and Wei Liu. "Synthesis, Spectroscopic Properties of Bis-Boc-L-alanine Modified 1,8-Naphthyridine Ligand Induced by Cr³⁺." Applied Mechanics and Materials 716-717 (December 2014): 163–66. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.163.

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One Bis-Boc-L-alanine-1,8-naphthyridine ligand containing amino acid by amido bond named 2,7-Bis-Boc-L-alanine-1,8-naphthyridine (L1) was synthesized and characterized. And there absorption and fluorescence spectra in methanol is presented. Then, the comprehensive study of spectroscopic properties upon titration of L1 with heavy metal ions as ion source in CH3OH was investigated. It shows compound L1 can use as a fluorescent probe for heavy metal ions like Cr3+.

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28

Lyczko, Krzysztof, Joanna E. Rode, and Jan Cz Dobrowolski. "Chiral Lanthanide Complexes with l- and d-Alanine: An X-ray and Vibrational Circular Dichroism Study." Molecules 25, no. 12 (June 12, 2020): 2729. http://dx.doi.org/10.3390/molecules25122729.

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A whole series of [Ln(H2O)4(Ala)2]26+ dimeric cationic lanthanide complexes with both l- and d-alanine enantiomers was synthesized. The single-crystal X-ray diffraction at 100 and 292 K shows the formation of two types of dimers (I and II) in crystals. Between the dimer centers, the alanine molecules behave as bridging (μ2-O,O’-) and chelating bridging (μ2-O,O,O’-) ligands. The first type of bridge is present in dimers I, while both bridge forms can be observed in dimers II. The IR and vibrational circular dichroism (VCD) spectra of all l- and d-alanine complexes were registered in the 1750–1250 cm−1 range as KBr pellets. Despite all the studied complexes are exhibiting similar crystal structures, the spectra reveal correlations or trends with the Ln–O1 distances which exemplify the lanthanide contraction effect in the IR spectra. This is especially true for the positions and intensities of some IR bands. Unexpectedly, the ν(C=O) VCD bands are quite intense and their composed shapes reveal the inequivalence of the C=O vibrators in the unit cell which vary with the lanthanide. Unlike in the IR spectra, the ν(C=O) VCD band positions are only weakly correlated with the change of Ln and the VCD intensities at most show some trends. Nevertheless, this is the first observation of the lanthanide contraction effect in the VCD spectra. Generally, for the heavier lanthanides (Ln: Dy–Lu), the VCD band maxima are very close to each other and the mirror reflection of the band of two enantiomers is usually better than that of the lighter Lns. DFT calculations show that the higher the multiplicity the higher the stability of the system. Actually, the molecular geometry in crystals (at 100 K) is well predicted based on the highest-spin structures. Also, the simulated IR and VCD spectra strongly depend on the Ln electron configuration but the best overall agreement was reached for the Lu complex, which is the only system with a fully filled f-shell.

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29

Ignatius, I. Cicili, S. Dheivamalar, K. Kirubavathi, and K. Selvaraju. "Experimental and DFT computational studies of L-alanine cadmium chloride crystals." International Journal of Computational Materials Science and Engineering 05, no. 01 (March 2016): 1630001. http://dx.doi.org/10.1142/s2047684116300015.

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In this work, we report the combined experimental and theoretical study on molecular structure and vibrational spectra of nonlinear optical crystal L-alanine cadmium chloride (LACC). The single X-ray diffraction studies have revealed that the compound crystallizes in monoclinic system C2 space group with cell parameters [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. FTIR and Raman spectra of the nonlinear optical materials LACC have been recorded and analyzed. The optimized geometric bond length and bond angles are obtained with the help of density functional theory (DFT) (B3LYP) calculation. The optimized geometric bond lengths and bond angles obtained by using DFT show good agreement with the experimental data. Using the natural bond orbital analysis the electronic effect and hydrogen bonding were confirmed. The HOMO–LUMO energy gap and the first order hyperpolarizability were calculated and it supports the nonlinear optical activity of LACC crystal.

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30

Corbeil, Marie-Claude, André L. Beauchamp, Serge Alex, and Rodrigue Savoie. "Interaction of the methylmercury cation with glycine and alanine: a vibrational and X-ray diffraction study." Canadian Journal of Chemistry 64, no. 9 (September 1, 1986): 1876–84. http://dx.doi.org/10.1139/v86-309.

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The complexes (CH3Hg)Gly, (CH3Hg)(L-Ala), and (CH3Hg)(DL-Ala) were prepared by reacting CH3HgOH with glycine (HGly) and alanine (HAla). Crystals of (CH3Hg)(DL-Ala) are monoclinic, space group P21/c, a = 9.460(2), b = 8.794(2), c = 8.723(2) Å, β = 97.49(2)°, Z = 4. The structure was refined on 935 MoKα reflections to R = 0.042. The complex results from displacement of an alanine NH3+ proton by the CH3Hg+ ion, which is linearly bonded to the —NH2 group. An intramolecular Hg … O contact of 2.63 Å is also formed with a carboxylate oxygen. The Raman and infrared spectra of solid (CH3Hg)Gly and (CH3Hg)(L-Ala) are compared with those of the ligands. Raman spectra of aqueous solutions at different pH indicate that the NH2-bonded structure is retained in solution, although no complexation via the carboxylate occurs.

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31

McClenaghan, Neville H., Siobhan M. Scullion, Brian Mion, Chandralal Hewage, J. Paul G. Malthouse, Peter R. Flatt, Philip Newsholme та Lorraine Brennan. "Prolonged L-alanine exposure induces changes in metabolism, Ca2+ handling and desensitization of insulin secretion in clonal pancreatic β-cells". Clinical Science 116, № 4 (15 січня 2009): 341–51. http://dx.doi.org/10.1042/cs20080138.

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Acute insulin-releasing actions of amino acids have been studied in detail, but comparatively little is known about the β-cell effects of long-term exposure to amino acids. The present study examined the effects of prolonged exposure of β-cells to the metabolizable amino acid L-alanine. Basal insulin release or cellular insulin content were not significantly altered by alanine culture, but acute alanine-induced insulin secretion was suppressed by 74% (P<0.001). Acute stimulation of insulin secretion with glucose, KCl or KIC (2-oxoisocaproic acid) following alanine culture was not affected. Acute alanine exposure evoked strong cellular depolarization after control culture, whereas AUC (area under the curve) analysis revealed significant (P<0.01) suppression of this action after culture with alanine. Compared with control cells, prior exposure to alanine also markedly decreased (P<0.01) the acute elevation of [Ca2+]i (intracellular [Ca2+]) induced by acute alanine exposure. These diminished stimulatory responses were partially restored after 18 h of culture in the absence of alanine, indicating reversible amino-acid-induced desensitization. 13C NMR spectra revealed that alanine culture increased glutamate labelling at position C4 (by 60%; P<0.01), as a result of an increase in the singlet peak, indicating increased flux through pyruvate dehydrogenase. Consistent with this, protein expression of the pyruvate dehydrogenase kinases PDK2 and PDK4 was significantly reduced. This was accompanied by a decrease in cellular ATP (P<0.05), consistent with diminished insulin-releasing actions of this amino acid. Collectively, these results illustrate the phenomenon of β-cell desensitization by amino acids, indicating that prolonged exposure to alanine can induce reversible alterations to metabolic flux, Ca2+ handling and insulin secretion.

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32

Peimel-Stuglik, Zofia, Stanisław Kowalak та Aldona Jankowska. "EPR spectra of γ-irradiated dl-α-alanine supported on molecular sieves". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 69, № 5 (травень 2008): 1395–404. http://dx.doi.org/10.1016/j.saa.2007.09.042.

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33

Berezhinsky, L. I., G. I. Dovbeshko, M. P. Lisitza, and G. S. Litvinov. "Vibration spectra of crystalline β-alanine in near and far infrared range." Biopolymers and Cell 7, no. 6 (November 20, 1991): 57–64. http://dx.doi.org/10.7124/bc.0002ff.

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34

Musa, Shuaibu, S. O. Idris, and A. D. Onu. "Synthesis, characterization, x-ray diffraction studies and biological activities of iron(III) and cobalt(II) complexes with alanine." International Journal of Advanced Chemistry 6, no. 2 (July 23, 2018): 132. http://dx.doi.org/10.14419/ijac.v6i2.13107.

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Анотація:

The resulted complexes produced between Fe (III) and Co (II) with biological molecules like amino acids play an important role in human life. They can be used as bioactive compounds as well as in industries. Fe (III) and Co (II) complexes are synthesized with Alanine amino acid. The complexes were characterized by X-ray diffraction, magnetic suscetivility, elemental analysis (AAS), molar conductance, melting point, infrared and uv-visible spectrophotometry analyses. The elemental analyses were used to determine the chelation ratio, 1:3(metal: ligands) for iron (III) Alanine and 1:2 ratio for cobalt (II) Alanine. The molar conductivity of the complexes show that the complexes are not electrolytic in nature. The x-ray data suggest monoclinic crystal system for all the complexes with the exception of Co-alanine, which is hexagonal. The magnetic susceptivility and electronic spectra suggest the complexes are high spin with octahedral geometry.The complexes show enhance activity in comparable to the amino acid.

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35

Wang, Yan, Da Ting Tian, and Yi Xin Yang. "Synthesis, Characterization, Room Temperature Fluorescence and Phosphorescence Properties of Complex Gd(C₅H₈NO₃)₂(C₃H₅N₂)₂Cl₃•3H₂O." Advanced Materials Research 399-401 (November 2011): 987–91. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.987.

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One solid coordination compound of Gadolinium chloride with N-acetyl-DL-alanine (C5H9NO3, Ac-Ala) and imidazole(C3H4N2,Im) has been prepared in absolute alcohol. The general formula Gd(C5H8NO3)2(C3H5N2)2Cl3•3H2O of these compounds was identified using the methods such as chemical and elemental analysis, FTIR spectra and UV spectra. The process of thermal decomposition was studied by TG-DTG. Room temperature fluorescence and phosphorescence measurement showed that the compound has good fluorescence and phosphorescence properties.

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36

Singh, Amit T., Mahendra M. Khandepekar, M. M. Khandpekar, and S. G. Gaurkhede. "Enhanced Luminescence of L-Alanine Capped LaF₃:Ce Nanoparticles Useful in Biological Labeling." Journal of Nano Research 32 (May 2015): 81–92. http://dx.doi.org/10.4028/www.scientific.net/jnanor.32.81.

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Hexahedral nanocrystals of L-Alanine [CH3CH(NH2)COOH] doped LaF3:Ce (ALFC) of assorted sizes have been synthesized in deionized water using water soluble chlorides of lanthanides with subsequent microwave irradiation to reduce agglomeration. The average particle sizes obtained by XRD, SEM, and TEM have been 22nm, 37nm and 23nm respectively. The surface modification by functional groups of L-Alanine is observed in the FTIR and FT-RAMAN spectra and their decomposition is studied in TGA/DTA spectrum .The electron-phonon interaction of A1gphonon mode and fundamental Egphonon mode have been observed in far infra-red region by FT-RAMAN spectra. The UV-Vis spectrum shows multiple absorption edges corresponding to energies at E1= 5.11eV, E2= 4.47eV, and E3=5.781eV which indicates the quantum dot nature of the nanocrystals and its application in optoelectronic devices. ALFC nanocrystals showed green color emission peak centered at 554 nm with their potential application in bio imaging and bio tagging.Keywords: nanostructures, fluorides, Transmission electron microscopy, Raman spectroscopy, Thermogravimetric analysis (TGA).

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37

Rousu, Juho, Ari Rantanen, Raimo A. Ketola, and Juha T. Kokkonen. "Isotopomer distribution computation from tandem mass spectrometric data with overlapping fragment spectra." Spectroscopy 19, no. 1 (2005): 53–67. http://dx.doi.org/10.1155/2005/575686.

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We present a method for determination of the isotopomer distributions of metabolites from the data generated by a tandem mass spectrometer. The method is an improvement over existing method as it is able to deal with overlapping fragments in the spectra. Our experiments indicate that the new method surpasses its predecessors in separating isotopomers from each other. When using the daughter ion scanning (collision induced dissociation) mode, the method was shown to be able to constrain the isotopomer distribution of different amino acids better than two existing methods. In particular, the isotopomer distributions of three amino acids, glycine, alanine and serine, can be fully uncovered with the method. However, due to the imperfect fragmentation of molecules in the tandem mass spectrometer, isotopomer distributions of larger amino acids still cannot be fully uncovered. In tests with isotope-labelled alanine, most accurate results were obtained using multiple reaction monitoring and 15 eV collision energy. The meausured isotopomer frequecies were in the range 99?106% of the theoretical value and the deviation between repetitions was in the range 1?10%.

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38

Fleck, M., and A. M. Petrosyan. "Comments on papers reporting IR-spectra and other data of alleged L-alanine alaninium nitrate and L-alanine sodium nitrate crystals." Crystal Research and Technology 44, no. 7 (July 2009): 769–72. http://dx.doi.org/10.1002/crat.200900150.

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39

CHOI, Hoon, Byungil LEE, Inbok SUNG, and Youngki LIM. "EPR Spectra of Alanine Pellets and Lithium Formate Powder in Nuclear Power Plants." Progress in Nuclear Science and Technology 1 (February 25, 2011): 150–53. http://dx.doi.org/10.15669/pnst.1.150.

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40

Kaneko, Fusae, Kazutoshi Yagi-Watanabe, Masahito Tanaka, and Kazumichi Nakagawa. "Natural Circular Dichroism Spectra of Alanine and Valine Films in Vacuum Ultraviolet Region." Journal of the Physical Society of Japan 78, no. 1 (January 15, 2009): 013001. http://dx.doi.org/10.1143/jpsj.78.013001.

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41

Rozenberg, M., G. Shoham, I. Reva, and R. Fausto. "Low-temperature Fourier transform infrared spectra and hydrogen bonding in polycrystalline l-alanine." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 59, no. 14 (December 2003): 3253–66. http://dx.doi.org/10.1016/s1386-1425(03)00159-8.

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42

Migliori, A., P. M. Maxton, A. M. Clogston, E. Zirngiebl, and M. Lowe. "Anomalous temperature dependence in the Raman spectra ofl-alanine: Evidence for dynamic localization." Physical Review B 38, no. 18 (December 15, 1988): 13464–67. http://dx.doi.org/10.1103/physrevb.38.13464.

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43

Stepanian, Stepan G., Alexander Yu Ivanov та Ludwik Adamowicz. "FTIR spectra and conformational structure of deutero-β-alanine isolated in argon matrices". Journal of Molecular Spectroscopy 320 (лютий 2016): 13–24. http://dx.doi.org/10.1016/j.jms.2015.12.010.

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44

Basiuk, Vladimir A. "Calculated gas-phase infrared spectra of imidazo[1,2-a]pyrazinediones derived from alanine." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 59, no. 8 (June 2003): 1867–79. http://dx.doi.org/10.1016/s1386-1425(02)00422-5.

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45

Kumar, Santosh, Amareshwar Kumar Rai, S. B. Rai, D. K. Rai, A. N. Singh, and V. B. Singh. "Infrared, Raman and electronic spectra of alanine: A comparison with ab intio calculation." Journal of Molecular Structure 791, no. 1-3 (June 2006): 23–29. http://dx.doi.org/10.1016/j.molstruc.2006.01.004.

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46

Rosado, Mário Túlio S., Maria Leonor R. S. Duarte та Rui Fausto. "Vibrational spectra (FT-IR, Raman and MI-IR) of α- and β-alanine". Journal of Molecular Structure 410-411 (червень 1997): 343–48. http://dx.doi.org/10.1016/s0022-2860(96)09695-0.

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47

Pfisterer, Wolfgang K., Ronald A. Nieman, Adrienne C. Scheck, Stephen W. Coons, Robert F. Spetzler, and Mark C. Preul. "Using ex vivo proton magnetic resonance spectroscopy to reveal associations between biochemical and biological features of meningiomas." Neurosurgical Focus 28, no. 1 (January 2010): E12. http://dx.doi.org/10.3171/2009.11.focus09216.

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Object The goal in this study was to determine if proton (1H) MR spectroscopy can differentiate meningioma grade and is associated with interpretations of biological behavior; the study was performed using ex vivo high-resolution spectra indicating metabolic characteristics. Methods Sixty-eight resected tissue samples of meningiomas were examined using ex vivo 1H MR spectroscopy. Of these meningiomas, 46 were WHO Grade I, 14 were WHO Grade II, and 8 were WHO Grade III. Fifty-nine were primary meningiomas and 9 were recurrences. Invasion of adjacent tissue (dura mater, bone, venous sinus, brain) was found in 32 cases. Thirty-nine meningiomas did not rapidly recur (as defined by expansion on MR imaging within a 5-year follow-up period), whereas rapid recurrence was confirmed in 24 meningiomas, and follow-up status was unknown in 5 cases. Results The absolute concentrations of total alanine and creatine were decreased in high-grade compared with low-grade meningiomas, as was the ratio of glycine to alanine (all p < 0.05). Additionally, alanine and the glycine/alanine ratio distinguished between primary and recurrent meningiomas (all p < 0.05). Finally, the absolute concentrations of alanine and creatine, and the glycine/alanine and choline/glutamate ratios were associated with rapid recurrence (p < 0.05). Conclusions . These data indicate that meningioma tissue can be characterized by metabolic parameters that are not typically identified by histopathological analysis alone. Creatine, glycine, and alanine may be used as markers of meningioma grade, recurrence, and the likelihood of rapid recurrence. These data validate a previous study of a separate group of Grade I meningiomas.

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48

Varughese, K. A., R. H. Angus, P. R. Carey, H. Lee, and A. C. Storer. "The structure and resonance Raman spectra – structure correlations for methyloxycarbonyl-L-phenylalanyl-L-alanine ethyl dithioester." Canadian Journal of Chemistry 64, no. 8 (August 1, 1986): 1668–73. http://dx.doi.org/10.1139/v86-274.

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The structure of methyloxycarbonyl-L-phenylalanyl-L-alanine ethyl dithioester has been determined by X-ray crystallographic analysis. The N—C—C—S(thiol) and C—N—C—C(S) torsional angles are 141(1)° and −69(2)°, respectively. Consequently, the N and thiono (C=S) sulfur atoms are in close contact and the [Formula: see text](thiono) distance is 3.078(5) Å. The structure is a perturbed A conformer, which we designate A′, by analogy to a previously characterised A conformer (Huber etal., Biochemistry, 21 3109 (1982)). The [Formula: see text] angles for the Phe residue are −87(2) and 151(2)°, respectively. A Raman spectroscopic study of a single crystal of the LL form and a resonance Raman (RR) spectroscopic study of powdered methyloxycarbonyl-L-phenylalanyl-DL-alanine ethyl dithioester establish the RR signature of the dithio moiety for the compound in the A′ form. The RR spectrum of the dithioester in CCl4 defines the RR signature for the C5 form in solution, while the RR spectrum from a solution in H2O/CH3CN provides information on the signatures of the A and B conformers. As for the case of N-benzoyl-DL-alanine dithioester, the A and C5 signatures of the title compound closely resemble those for glycine-based dithioesters but the key marker bands for the B conformer are shifted by ≈30 cm−1 to lower frequency compared to those for a glycine dithioester.

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49

Lokitz, Brad S., Jonathan E. Stempka, Adam W. York, Yuting Li, Hitesh K. Goel, G. Reid Bishop, and Charles L. McCormick. "Chiroptical Properties of Homopolymers and Block Copolymers Synthesized from the Enantiomeric Monomers N-Acryloyl-L-Alanine and N-Acryloyl-D-Alanine Using Aqueous RAFT Polymerization." Australian Journal of Chemistry 59, no. 10 (2006): 749. http://dx.doi.org/10.1071/ch06264.

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Chiral homo- and block copolymers based on the enantiomeric monomers N-acryloyl-l-alanine (ALAL) and N-acryloyl-d-alanine (ADAL) were prepared directly in water using controlled reversible addition–fragmentation chain transfer (RAFT) polymerization. The polymerization of the chiral monomers proceeded in a controlled fashion producing the respective homopolymers, block copolymers, and a statistical copolymer with targeted molecular weights and narrow molecular weight distributions. The chiroptical activity of these biomimetic polymers and their analogous model compounds was investigated using circular dichroism (CD). P(ALAL) and P(ADAL) were shown to be optically active exhibiting mirror image CD spectra. In addition, statistical and enantiomeric block copolymers prepared at 1:1 stochiometric ratios exhibited virtually no optical activity.

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50

Vejdělek, Zdeněk, Jan Metyš, Jiří Holubek, Miloš Buděšínský, Emil Svátek, Oluše Matoušová, and Miroslav Protiva. "Potentional anxiolytics and hypnotics: 1-(Alkanesulfonamidoalkyl)-6-aryl-8-halogeno-s-triazolo[4,3-a]-1,4-benzodiazepines and related compounds." Collection of Czechoslovak Chemical Communications 53, no. 1 (1988): 132–44. http://dx.doi.org/10.1135/cccc19880132.

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7-Chloro-5-phenyl-1,3-dihydro-1,4-benzodiazepin-2-thione and its 5-(2-chlorophenyl) and 7-bromo-5-(2-chlorophenyl)analogues were reacted with N-(methanesulfonyl)- and N-(ethanesulfonyl)glycine and –alanine hydrazides (X-XIII) in boiling butanol to give the title compounds Iabc - IVabc. The alanine-derived substances IIIabc and IVabc were characterized by 1H NMR spectra as mixtures of two diastereoisomers. Similar reactions of 5-methylimidazole-4-carboxylic acid hydrazide (XIV) gave the s-triazolo[4,3-a]-1,4-benzodiazepines Vabc together with their ring-opened precursors XVI and XVII. The compounds prepared showed the activity profile of the anxiolytic and hypnotic 4H-s-triazolo[4,3-a]-1,4-benzodiazepine derivatives.

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