Raman Spectroscopic Identification of Bilirubin-Type Gallstone

1986 ◽  
Vol 40 (8) ◽  
pp. 1099-1103 ◽  
Author(s):  
Siding Zheng ◽  
Anthony T. Tu
Keyword(s):  
Raman Spectroscopy ◽  
Laser Raman Spectroscopy ◽  
Characteristic Line ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Stretching Vibration ◽  
Ion Laser ◽  
Spectroscopic Identification ◽  
Spectral Patterns ◽  
Argon Ion

A gallstone from Egypt was examined by laser Raman spectroscopy and identified to be a bilirubin-type stone. The surface of the stone, the subsurface interior, and the center of the stone were irradiated with the 514.5-nm argon-ion laser line. Spectra from the three areas gave similar Raman spectral patterns. Moreover, Raman spectra from the interior of the gallstone were identical to that of bilirubin standard. However, the examination of a Raman spectrum from the outer surface of the stone indicated that it contained cholesterol in addition to bilirubin. Bilirubin has the characteristic line of C=C stretching vibration at 1615 cm−1. Cholesterol has the characteristic line of C(5)=C(6) stretching vibration at 1674 cm−1. Cholesterol also has a strong characteristic line at 1439 cm−1. Therefore, it is quite easy to identify the constituents of gallstone by Raman spectroscopy.

scholarly journals Raman spectroscopic study of photosensitive damage to lysozyme structure sensitized by hypocrellin A

2006 ◽  
Vol 20 (5-6) ◽  
pp. 269-273 ◽  
Author(s):  
J. H. Zhou ◽  
X. H. Wu ◽  
S. H. Wei ◽  
X. T. Gu ◽  
Y. Y. Feng ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Main Chain ◽  
Molecular Level ◽  
Active Oxygen ◽  
Laser Raman Spectroscopy ◽  
Side Chain ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Raman Spectroscopic Study ◽  
Hypocrellin A

Laser Raman spectroscopy was used to detect the nature of the structural change in lysozyme sensitized by hypocrellin A (HA) at the molecular level. The results indicated that the orderly structure of lysozyme has been damaged by the active oxygen (1O2, O2−·and.OH, etc.) generated by HA, and cause the changes in H-bonds system of the main chain and the side chain of lysozyme.

Raman Spectroscopic Identification of Fibrous Natural Zeolites

1998 ◽  
Vol 52 (1) ◽  
pp. 54-63 ◽  
Author(s):  
Brigitte Wopenka ◽  
John J. Freeman ◽  
Tony Nikischer
Keyword(s):  
Beam Polarization ◽  
X Ray Diffraction ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Different Types ◽  
Spectroscopic Identification ◽  
The Difference ◽  
The Individual ◽  
Spectral Patterns ◽  
Raman Spectral

Laser Raman microprobe spectra of the natrolite group of zeolites (fibrous hydrous network aluminosilicates) can be used to unambiguously distinguish among the six members of this group, which is difficult by visual, microscopic, and X-ray diffraction methods. The natrolite group of zeolites includes the following minerals: natrolite (Na2Al2Si3O10·2H2O), scolecite (CaAl2Si3O10·3H2O), mesolite (Na2Ca2Al6Si9O30·8H2O), thomsonite (NaCa2Al5Si5O20·6H2O), gonnardite (Na2CaAl4Si6O20·7H2O), and edingtonite (BaAl2Si3O10·4H2O). Accurate locations of peak maxima are given, and complete Raman spectra (from 100 to 4000 Δcm−1) are shown for each mineral. The individual members of this structurally very similar group of minerals can be identified on the basis of the exact Raman peak positions of the two strongest bands near 440 and 535 Δcm−1, the number and positions of weaker bands, and the difference in the dependence of peak intensities upon beam polarization direction. However, the minerals can be especially easily identified on the basis of their strikingly different Raman spectral patterns in the O–H stretching region (3000–3700 Δcm−1). The number and width of peaks in this spectral region correlate with the three different types of framework structures that occur among the natrolite group minerals.

An X-ray Photoelectron (ESCA) and Laser Raman Spectroscopic Investigation of Aluminum Perrhenate

1980 ◽  
Vol 34 (6) ◽  
pp. 624-626 ◽  
Author(s):  
Lawrence Salvati ◽  
Gerald L. Jones ◽  
David M. Hercules
Keyword(s):  
Raman Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Heterogeneous Catalysts ◽  
Laser Raman Spectroscopy ◽  
Compound Formation ◽  
Reduction Behavior ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Significant Interest

Compound formation in supported heterogeneous catalysts is an area of significant interest. In the present study, Al(ReO4)3 was prepared and characterized by x-ray photoelectron spectroscopy and laser Raman spectroscopy. Characteristic spectra for Al(ReO4)3 are shown and compared to several rhenium reference compounds. The reduction behavior of Al(ReO4)3 is also explored; it was completely reduced to elemental rhenium in H2 at 500°C.

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