The potential of Raman spectroscopy for the analysis of diagenetically transformed carotenoids

2010 ◽  
Vol 368 (1922) ◽  
pp. 3137-3144 ◽  
Author(s):  
Craig P. Marshall ◽  
Alison Olcott Marshall
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Organic Material ◽  
Polyene Chain ◽  
Biological Origin ◽  
Raman Spectroscopic ◽  
Hydrogenation Reactions ◽  
Derivatives Of ◽  
Β Carotene

Recently, carotenoids have received much attention as target compounds for astrobiological prospecting principally because they are a group of molecules that display unique diagnostic Raman spectra that can be assigned to organic material of unequivocal biological origin. However, no work has been performed on assessing the potential of Raman spectroscopic detection of carotenoids from fossilized microbes. Here, we report the first Raman spectra acquired from ‘perhydro’ derivatives of β-carotene and lycopene formed by hydrogenation of the polyene chain during diagenesis, resulting in much less specific fossil hydrocarbons such as β-carotane and lycopane, respectively. We propose here that diagenetically altered carotenoids formed by hydrogenation reactions during the fossilization processes also provide unique diagnostic spectra that can be interpreted as a biological signature.

Raman Spectroscopic Characterization of Hepatic Differentiation of Mesenchymal Stem Cells

2021 ◽  
Author(s):  
Sareh Arjmand ◽  
Aram Barzegar ◽  
Alemeh Mohammadpour ◽  
Hanieh Rezaei ◽  
Nahid Davoodian ◽  
...  
Keyword(s):  
Stem Cells ◽  
Raman Spectroscopy ◽  
Mesenchymal Stem Cells ◽  
Raman Spectra ◽  
Spectroscopic Characterization ◽  
Positive Control ◽  
Hepatic Differentiation ◽  
Raman Spectroscopic ◽  
Free Quartz ◽  
Differentiation Status

Background and Aims: Mesenchymal stem cells (MSCs) are a preferred cell source for the generation of hepatocyte-like cells in regenerative medicine. They can be isolated from different sources, including adipose tissues. The Raman spectroscopy approach was evaluated for quick and efficient identification of MSCs differentiation status and a broader perspective on cell differentiation. Materials and Methods: The human adipose-derived mesenchymal stem cells (hASCs) were differentiated toward hepatocyte-like cells using a well-established method. The cells were cultured on fluorescence-free quartz discs, and the efficiency of differentiation was examined using molecular and biochemical methods. The Raman spectra were recorded at days 1, 7, 14, and 21 of differentiation, and HepG2 was used as a positive control. Results: The changes in Raman spectra were detected during the sequential stages of differentiation, and the pattern of peaks on the last day of differentiation was remarkably similar to the positive control (HepG2). Conclusion: Raman spectroscopy showed considerable potential to characterize hepatic differentiation.

Raman Spectroscopic Investigation of the Physical State of para-Nitroaniline in Channels of the AIPO4-5 Molecular Sieve

1994 ◽  
Vol 48 (2) ◽  
pp. 224-227 ◽  
Author(s):  
W. Hill ◽  
F. Marlow ◽  
J. Kornatowski
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Spectroscopic Investigation ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Physical State ◽  
Second Phase ◽  
Crystal Axis ◽  
Raman Spectroscopic ◽  
Nutation Angle

The physical state of para-nitroaniline ( p-NA) adsorbed in the channels of AlPOj-5 molecular sieves has been investigated by means of Raman spectroscopy. The Raman spectra show that the p-NA molecules within the channels form either a phase of head-to-tail chains similar to that in the solid crystaline p-NA with a characteristic ω3 band at 1282 cm−1 or a second phase, which is characterized by the similarly strong band around 1295 cm−1. This second phase consists of weakly interacting p-NA molecules in a similar pseudo-quinonoidic state as molten p-NA. Despite the missing formation of solid-like chains, molecules in the second phase are also highly orientated. However, their mean nutation angle with respect to the crystal axis z is about 16°, and, thus, it is larger than that of the chains.

Raman spectroscopic determination of phase evolutions in LiAlxCo1−xO2 battery materials

2001 ◽  
Vol 16 (1) ◽  
pp. 1-4 ◽  
Author(s):  
P. S. Dobal ◽  
R. S. Katiyar ◽  
M. S. Tomar ◽  
A. Hidalgo
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Raman Spectra ◽  
Sintering Temperature ◽  
Monoclinic Space Group ◽  
Battery Materials ◽  
Space Group ◽  
Raman Spectroscopic ◽  
Al Content

Superior battery materials LiAlxCo1−xO2 (x = 0.0, 0.1, 0.3, 0.5, and 0.7) were synthesized using a solution-based route at various sintering temperatures (450–800 °C). In this communication, we report on the use of Raman spectroscopy to study effect of composition and sintering temperature on the resulting material. The phase evolutions in LiAlxCo1−xO2 compositions were studied using micro-Raman spectroscopy and a phase diagram is proposed based on the observations. For less Al content, the low-temperature phases of LiAlxCo1−xO2 showed Raman spectra corresponding to a monoclinic (space group C2/m) structure, while a low-temperature spinel (space group Fd3m) phase was observed for 50% or more Al in these compounds. All these compositions exhibited a layered hexagonal (space group R3m) structure when sintered above 700 °C. Raman spectra also revealed residual Co3O4 in the low-temperature forms of LiCoO2 and LiA10.01Co0.9O2.

Raman Spectroscopic Discovery of the Hydrogenthiosulphate Anion, HSSO3-, in Solid NH4HS2O3 [1]

1989 ◽  
Vol 44 (12) ◽  
pp. 1499-1502 ◽  
Author(s):  
Ralf Steudel ◽  
Andreas Prenzel
Keyword(s):  
Raman Spectroscopy ◽  
Sulphuric Acid ◽  
Raman Spectra ◽  
Elemental Sulfur ◽  
Anhydrous Methanol ◽  
Raman Spectroscopic ◽  
Bending Mode ◽  
Vibrational Wavenumbers

Reaction of ammonium thiosulphate with concentrated sulphuric acid in anhydrous methanol at —80°C affords [NH4][HS2O3] the anion of which was shown by Raman spectroscopy to have the structure HSSO3- (stretching vibrational wavenumbers: SS = 403, SH = 2486, SO = 1027, 1183, and 1219 cm-1; SSH bending mode = 873 cm-1 at —80°C). This salt decomposes at —20°C to give, inter alia, elemental sulfur. The Raman spectra of ND4DS2O3 and (NH4)2S2O3 are also reported.

A Raman Spectroscopic Investigation of Heteropolymolybdate Species in Aqueous Solution

1978 ◽  
Vol 32 (6) ◽  
pp. 537-540 ◽  
Author(s):  
Melody Starr Kasprzak ◽  
S. R. Crouch ◽  
G. E. Leroi
Keyword(s):  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Spectroscopic Investigation ◽  
Molybdophosphoric Acid ◽  
Raman Spectroscopic ◽  
Ph Dependent ◽  
First Time ◽  
Decomposition Schemes

Raman spectroscopy has been applied to the study of the pH-dependent decomposition of 12-molybdophosphoric acid, H3(PMo12O40), and 12-molybdosilicic acid, H4(SiMo12O40), in aqueous solution. The decomposition schemes involving several smaller polymeric molybdate species, proposed from indirect techniques such as electrochemistry, are confirmed. Identification of the species present in solution is made by comparison of the Raman spectra to the spectra of known species, except in the case of (PMo11O39)7-, for which the spectrum is reported for the first time.

Submicron Simultaneous IR and Raman Spectroscopy (IR+Raman): Breakthrough Developments in Optical Photothermal IR (O-PTIR) Combined for Enhanced Failure Analysis

2019 ◽  
Author(s):  
Jay Anderson ◽  
Mustafa Kansiz ◽  
Michael Lo ◽  
Curtis Marcott
Keyword(s):  
Raman Spectroscopy ◽  
Failure Analysis ◽  
Data Quality ◽  
Raman Spectra ◽  
Spatial Resolution ◽  
Far Field ◽  
Field Mode ◽  
Microscopic Scale ◽  
Analytical Tools ◽  
Ir And Raman

Abstract Failure analysis of organics at the microscopic scale is an increasingly important requirement, with traditional analytical tools such as FTIR and Raman microscopy, having significant limitations in either spatial resolution or data quality. We introduce here a new method of obtaining Infrared microspectroscopic information, at the submicron level in reflection (far-field) mode, called Optical-Photothermal Infrared (O-PTIR) spectroscopy, that can also generate simultaneous Raman spectra, from the same spot, at the same time and with the same spatial resolution. This novel combination of these two correlative techniques can be considered to be complimentary and confirmatory, in which the IR confirms the Raman result and vice-versa, to yield more accurate and therefore more confident organic unknowns analysis.

scholarly journals Quantitative and Qualitative Analysis of Some Inorganic Compounds by Raman Spectroscopy

1994 ◽  
Vol 48 (7) ◽  
pp. 875-883 ◽  
Author(s):  
Daniel R. Lombardi ◽  
Chao Wang ◽  
Bin Sun ◽  
Augustus W. Fountain ◽  
Thomas J. Vickers ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Qualitative Analysis ◽  
Raman Spectra ◽  
Solid Phase ◽  
Inorganic Compounds ◽  
Core Material ◽  
Storage Tanks ◽  
Hanford Site ◽  
Sampling Probe

Raman spectra have been measured for a number of nitrates, nitrites, sulfates, ferrocyanides, and ferricyanides, both in the solid phase and in aqueous solution. Accurate locations of peak maxima are given. Limits of detection for some of the compounds are given for solutions and for solid mixtures in NaNO3. Preliminary measurements have been made on core material recovered from the storage tanks on the Hanford site in Richland, Washington. Representative spectra are presented, showing that it is possible to observe responses of individual components from measurements made directly on untreated cores, with the use of a fiberoptic sampling probe.

scholarly journals Hydrogen Bonds: Raman Spectroscopic Study

2021 ◽  
Vol 22 (10) ◽  
pp. 5380
Author(s):  
Boris A. Kolesov
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Spectroscopic Study ◽  
Raman Spectra ◽  
Temperature Region ◽  
Vibrational Frequency ◽  
Chemical Compounds ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Proton Dynamics

The work outlines general ideas on how the frequency and the intensity of proton vibrations of X–H×××Y hydrogen bonding are formed as the bond evolves from weak to maximally strong bonding. For this purpose, the Raman spectra of different chemical compounds with moderate, strong, and extremely strong hydrogen bonds were obtained in the temperature region of 5 K–300 K. The dependence of the proton vibrational frequency is schematically presented as a function of the rigidity of O-H×××O bonding. The problems of proton dynamics on tautomeric O–H···O bonds are considered. A brief description of the N–H···O and C–H···Y hydrogen bonds is given.

scholarly journals Simulated Raman spectra of Bulk and Low-Dimensional Phosphorus Allotropes

2021 ◽  
Author(s):  
Anthony Impellizzeri ◽  
Anya Vorfolomeeva ◽  
Nikolay Surovtsev ◽  
Alexander V. Okotrub ◽  
Chris Ewels ◽  
...  
Keyword(s):  
Comparative Study ◽  
Raman Spectra ◽  
Raman Spectroscopic ◽  
Low Dimensional

We present a comprehensive theoretical and experimental Raman spectroscopic comparative study of bulk Phosphorus allotropes (white, black, Hittorf’s, Fibrous) and their monolayer equivalents, demonstrating that the application of the Placzek...

Sign in / Sign up

Export Citation Format

Share Document