scholarly journals Insights into the infrared and Raman spectra of fresh and lyophilized royal jelly and protein degradation IR spectroscopy study during heating

2015 ◽  
Vol 34 (1) ◽  
pp. 87 ◽  
Author(s):  
Sofija Lazarevska ◽  
Petre Makreski
Keyword(s):  
Raman Spectra ◽  
Royal Jelly ◽  
Chemical Diversity ◽  
Vibrational Modes ◽  
Infrared And Raman Spectra ◽  
Spectroscopy Study ◽  
Mineral Salts ◽  
Complex Product ◽  
Protein Secondary Structures ◽  
Ir And Raman

<p>            In terms of chemical composition, a honeybee secretion known as royal jelly (RJ) is very complex product containing water, proteins, carbohydrates, lipids, mineral salts and small amounts of polyphenols, vitamins and enzymes. Despite its chemical diversity, the bands originating from vibrational modes of the present proteins were successfully assigned in 1800–1200 cm<sup>–1</sup> (Raman and IR) region where the interference of bands from other vibrational species is not substantial. The protein bands were attributed to amide I, amide II and amide III modes and their intensities, additionally, enabled to determine the protein secondary structures. The remaining bands up to 4000 cm<sup>–1</sup> were attributed to other group vibrations whereas the region below 1200 cm<sup>–1 </sup>comprises bands from complex interacting modes within the major RJ components that can not be unequivocally attributed to distinct modes. The work also represents a pioneering effort to collect and interpret the Raman spectrum of fresh and lyophilized RJ samples and to correlate and describe the observed similarities/differences between IR and Raman spectra.</p>

Illumination- and Annealing-Induced Changes in the Infrared and Raman Spectra of a-Si:H

2001 ◽  
Vol 664 ◽  
Author(s):  
L.-F. Arsenault ◽  
S. Lebiba ◽  
E. Sacher ◽  
A. Yelon
Keyword(s):  
Raman Spectrum ◽  
Raman Spectra ◽  
Qualitative Agreement ◽  
Raman Signal ◽  
Infrared And Raman Spectra ◽  
Matrix Elements ◽  
Short Term ◽  
Phonon Peak ◽  
Induced Changes ◽  
Ir And Raman

ABSTRACTWe have investigated the changes, produced by light-soaking, in both the IR and Raman responses of the Si-Hn stretching peaks in the 2000-2100 cm−1 range. Our observations of the IR response are in qualitative agreement with those of Kong and co-workers [1]: that is, short-term light soaking produces an increase in the intensity of the signal and a simultaneous shift to lower frequency. In contrast, short-term light soaking decreases the total intensity of the Raman signal in the 2000-2100 cm−1 range, when normalized to the TO phonon peak at about 480 cm−1. In both cases, these modifications are reversed on annealing at 200° C. We suggest that these changes are attributable to alterations in the environments of the Si-Hn bonds, with the resultant transfer of intensity between IR and Raman matrix elements. Details of the evolution of the components of the Raman spectrum in the 2000-2100 cm−1 range are presented, and compared with IR changes in the same range.

CHARACTERISTIC VIBRATIONAL MODES OF H2O ADSORBED MOLECULARLY AND DISSOCIATIVELY ON TITANIUM OXIDE CLUSTERS

2012 ◽  
Vol 11 (06) ◽  
pp. 1289-1295 ◽  
Author(s):  
HONGBO DU ◽  
ABIR DE SARKAR ◽  
YU JIA ◽  
RUI-QIN ZHANG
Keyword(s):  
Water Molecule ◽  
Raman Spectra ◽  
High Frequency ◽  
Dissociative Adsorption ◽  
Vibrational Modes ◽  
High Frequency Range ◽  
Frequency Range ◽  
Adsorbed State ◽  
The One ◽  
Ir And Raman

To provide useful information on dissociation of water molecule on ( TiO2 )n clusters for experimental verification, we have calculated the infrared (IR) and Raman spectra of three possible states involved, namely molecularly adsorbed state, metastable state and dissociatively adsorbed state, using density functional theory at the B3LYP/6-311G(d) level. We find that the characteristic bands of H2O molecules below 2000 cm-1 in both IR and Raman spectra vanish upon both molecular and dissociative adsorption of H2O . In the high frequency range of 3600–4200 cm-1, the adsorption caused the single IR peak of water to split into two bands, while the dissociation removed the one at lower frequency and blue shifted slightly the higher frequency band. The two Raman peaks of the water molecule in the same high frequency range were slightly blue shifted upon adsorption but the one at lower frequency was removed upon dissociation, while the one at high frequency blue shifted slightly. The intensities of vibrational modes of water in 3600–4200 cm-1 are generally significantly enhanced upon both molecular and dissociative adsorption. Our results show clearly signatures of dissociation of water molecule into hydroxyl radical at the terminal site.

Vibrational Properties of Sodium Substituted β-Tricalcium Phosphate

2007 ◽  
Vol 361-363 ◽  
pp. 75-78 ◽  
Author(s):  
Sophie Quillard ◽  
Laetitia Obadia ◽  
Philippe Deniard ◽  
Bruno Bujoli ◽  
Jean Michel Bouler
Keyword(s):  
Raman Spectra ◽  
Crystalline Structure ◽  
Tricalcium Phosphate ◽  
Vibrational Properties ◽  
Vibrational Modes ◽  
Infrared And Raman Spectra ◽  
Different Types

The infrared and Raman spectra of Na substituted β-TCP are presented for various levels of substitution. The influence of Na content on main vibrational modes appears significant and among them the ν1 symmetric stretching band is very sensitive to PO4 3- tetrahedrons environment. Thus, this mode was particularly investigated and has been decomposed using Lorentzian shapes components. We assigned the calculated components to the different types of PO4 3- tetrahedrons present in the crystalline structure.

Schwingungsspektren der Clusterverbindung Nb6F15/Vibrational Spectrum of the Cluster Compound Nb6F15

1989 ◽  
Vol 44 (1) ◽  
pp. 74-78 ◽  
Author(s):  
G. Kliche ◽  
H. G. von Schnering
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Vibrational Spectrum ◽  
Raman Spectra ◽  
Metal Cluster ◽  
Cluster Compound ◽  
Vibrational Modes ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Valence Force

Abstract Infrared and Raman spectra of the metal cluster compound [Nb6F12]F3 (cubic Im3̄m; Z = 2) are reported. The three intense m odes observed in the Raman spectrum at 215. 267, and 337 cm-1 and a weak mode observed in the infrared spectrum at 287 cm-1 are assigned to the T2g, Eg, A1g, and T1u vibrational modes of the Nb6 octahedra. The assignment is supported by normal coordinate analysis and Raman measurements at 47 kbar. The valence force constants are f(Nb-Fi) = 2.04, f(Nb-Fa-a) = 1.30 and f(Nb-Nb) = 0.97 N cm-1 metal-to-metal interaction in the cluster.

Far Infrared and Raman Spectra of (CH3)3SiCo(CO)4

1971 ◽  
Vol 25 (2) ◽  
pp. 182-186 ◽  
Author(s):  
J. R. Durig ◽  
S. J. Meischen ◽  
S. E. Hannum ◽  
R. R. Hitch ◽  
S. K. Gondal ◽  
...  
Keyword(s):  
Raman Spectrum ◽  
Solid State ◽  
Raman Spectra ◽  
Normal Modes ◽  
Far Infrared ◽  
Static Field ◽  
Infrared And Raman Spectra ◽  
Vibrational Assignment ◽  
Degenerate Modes ◽  
Ir And Raman

The ir spectra of (CH3)3SiCo(CO)4 in the gaseous (4000–250 cm−1) and solid (4000–33 cm−1) phases have been recorded. The Raman spectrum has also been recorded for the solid state. To aid in the assignment, the ir and Raman spectra were recorded of solid (CH3)3SiH. The vibrational assignment for most of the 60 normal modes has been given on the basis of the fundamental vibrations of the –Si(CH3)3 and –Co(CO)4 moities. The static field was sufficiently strong to split the degenerate modes but the correlation field was so weak that no definite splitting of the symmetric modes was detected.

Measurement and interpretation of infrared and raman spectra of bis(2,4-pentandionate)complexes of Cu(II) and Pd(II)

1985 ◽  
Vol 50 (2) ◽  
pp. 306-316 ◽  
Author(s):  
Blanka Vlčková ◽  
Bohuslav Strauch ◽  
Milan Horák
Keyword(s):  
Raman Spectra ◽  
Metal Atom ◽  
The Other ◽  
Ir And Raman Spectra ◽  
Particle Model ◽  
Central Metal Atom ◽  
Central Metal ◽  
Infrared And Raman Spectra ◽  
Empirical Interpretation ◽  
Ir And Raman

Infrared and Raman spectra of Cu(II) bis(2,4-pentandionate) and Pd(II) bis(2,4-pentandionate) complexes have been measured and interpreted. The coincidence of numerous bands in the IR and Raman spectra has been explained by the isolation effect of the heavy central metal atom which prevents the vibrational interaction of the two ligands in the chelate molecule with each other. An 11-particle model consisting of all the atoms of one ligand (both CH3 groups are taken as the point masses), a central metal atom and two oxygen atoms of the other ligand has been proved to be most adequate for the empirical interpretation of the spectra.

Infrared and Raman Spectra of Pyrazinium Halides

1970 ◽  
Vol 24 (6) ◽  
pp. 601-605 ◽  
Author(s):  
R. Foglizzo ◽  
A. Novak
Keyword(s):  
Raman Spectra ◽  
Ir And Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Frequency Shifts ◽  
Ir And Raman

The ir and Raman spectra of pyrazinium chloride and bromide and their ND deuterated derivatives have been obtained in the 4000–300 cm−1 range. Twenty-six fundamentals of the pyrazinium ion are identified and compared to those of the pyrazine molecule. Frequency shifts on protonation of pyrazine are discussed.

Internal Vibrations of the Tellurate Group in Compounds Me2(III)Te(VI)O6

1974 ◽  
Vol 29 (3-4) ◽  
pp. 153-155 ◽  
Author(s):  
G. Blasse ◽  
J. G. Kamphorst
Keyword(s):  
Raman Spectra ◽  
Spectral Position ◽  
Vibrational Modes ◽  
Infrared And Raman Spectra ◽  
Quenching Temperature ◽  
Space Group ◽  
Internal Vibrations

The infrared and Raman spectra of LaAlTeOe, LaGaTeO6, In2TeO6 and Y2TeO6 are reported. Structure proposals are confirmed and the space group of Y2TeO6 determined. A relation between spectral position of vibrational modes and quenching temperature of luminescence is outlined.

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