FT-Raman Spectroscopy of three Foliicolous Lichens from Costa Rican Rainforests

2002 ◽  
Vol 34 (3) ◽  
pp. 259-266 ◽  
Author(s):  
L. F. C. de Oliveira ◽  
H. G. M. Edwards ◽  
J. C. Feo-Manga ◽  
M. R. D. Seaward ◽  
R. Lücking
Keyword(s):  
Raman Spectroscopy ◽  
Calcium Ions ◽  
Calcium Oxalate Monohydrate ◽  
Costa Rican ◽  
Airborne Dust ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Foliicolous Lichens ◽  
Ft Raman Spectroscopy ◽  
Ft Raman

AbstractThe first FT-Raman spectroscopic study of foliicolous lichens is reported. Detailed spectra obtained by macroscopic and microscopic means for Calenia triseptata Zahlbr., Echinoplaca strigulacea (Müll. Arg.) R.Sant. and Tricharia carnea (Müll. Arg.) R.Sant. collected from Costa Rican rainforests have been interpreted mainly in terms of their xalate content. The Raman spectra show a significant presence of calcium oxalate monohydrate (whewellite) despite the lack of calcium ions available in the leaf itself. A reasonable explanation for its presence could be the result of the incorporation of calcium ions from airborne dust and/or dissolved in rain falling on the canopy.

FT-Raman Spectroscopic Study of Decorated Stained Glass

1998 ◽  
Vol 52 (5) ◽  
pp. 679-682 ◽  
Author(s):  
H. G. M. Edwards ◽  
J. K. F. Tait
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
19Th Century ◽  
Potential Application ◽  
Stained Glass ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Two Samples ◽  
Ft Raman Spectroscopy ◽  
Ft Raman

Two samples of decorated stained glass (14th century and 19th century) from Southwell Minster, Nottinghamshire, U.K. have been examined with the use of Fourier transform (FT)-Raman spectroscopy. The pigment used in both cases has been identified as red ochre, and the potential application of FT-Raman spectroscopy to an important area of conservation and restoration of glass artifacts is demonstrated.

scholarly journals Identification and Detection of Finasteride Polymorphs in Finasteride Tablets by FT-Raman Spectroscopy

2020 ◽  
Vol 32 (8) ◽  
pp. 1865-1868
Author(s):  
M. Chandra Sekhara Rao ◽  
R. Chenna Krishna Reddy ◽  
K.B. Chandra Sekhar ◽  
Y.V. Rami Reddy
Keyword(s):  
Raman Spectroscopy ◽  
Dosage Form ◽  
Spectroscopic Method ◽  
Weight Fraction ◽  
Polymorphic Form ◽  
Raman Spectroscopic ◽  
Solid Dosage ◽  
Ft Raman Spectroscopy ◽  
Tablet Preparation ◽  
Ft Raman

A simple FT-Raman spectroscopic method was developed for identification of finasteride polymorph form in finished dosage form. Finasteride polymorph form I was used in the tablet preparation and the weight fraction of finasteride in tablet was only about 0.023. The method was successfully used to identify the polymorphic form of finasteride in tablet and also to detect up to a level of about 15% of the other polymorph of finasteride present in the solid dosage. The dosage form was characterized by different techniques i.e. powdered X-ray diffraction, infrared spectroscopy and Raman spectroscopy. Based on literature survey, only Raman spectroscopy method is able to identify the polymorph of finasteride in dosage form.

Raman Spectroscopic Studies of Amsacrine

1992 ◽  
Vol 46 (10) ◽  
pp. 1540-1544 ◽  
Author(s):  
Catherine A. Butler ◽  
Ralph P. Cooney ◽  
William A. Denny
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Crystal Structure Data ◽  
Visible Spectrum ◽  
Spectroscopic Studies ◽  
Resonance Raman Spectrum ◽  
Raman Spectroscopic ◽  
Ft Raman Spectroscopy ◽  
Uv Visible ◽  
Ft Raman

Amsacrine (4′-(9-acridinylamino)methanesulfon- m-anisidide) in both solid and aqueous forms was characterized with the use of resonance and nonresonance Raman spectroscopy (including FT-Raman spectroscopy). Evidence that the acridine nucleus is the dominant chromophoric unit contributing to the resonance Raman spectrum is based upon the apparent similarities of the spectra of aqueous amsacrine (in the unpro-tonated form) and acridine (in ethanol). The probable non-coplanarity of the acridine and phenyl units in the amsacrine molecule (based on previously reported crystal structure data) is consistent with the suggestion that the acridine nucleus may constitute an independent chromophoric unit. Further evidence is derived from analysis of the UV-visible spectrum, which indicates that excitation at 457.9 nm falls within an electronic transition of the acridine nucleus of amsacrine. The excitation profiles of aqueous amsacrine are presented, and four types of profiles have been identified.

FT Raman Spectroscopy as a Tool for Characterization of Derivatized Silica Gel Sorbents

2005 ◽  
Vol 70 (2) ◽  
pp. 168-177
Author(s):  
Zuzana Tománková ◽  
Pavel Matějka ◽  
Karel Volka ◽  
Vladimír Král
Keyword(s):  
Raman Spectroscopy ◽  
Silica Gel ◽  
Stationary Phases ◽  
Amide Bonds ◽  
Raman Spectroscopic ◽  
Ft Raman Spectroscopy ◽  
Trimethylsilyl Groups ◽  
Ft Raman

The potential of Fourier-transform (FT) Raman spectroscopy for verification of individual steps of synthesis of new chromatographic stationary phases was studied. 3-Aminopropylated silica gel was modified with two different optically active compounds ((+)-cloprostenol, (+)-(R)-2,2'-dihydroxy-1,1'-binaphthalene-3-carboxylic acid) via amide bonds. In the next step, free silanol groups were protected with trimethylsilyl groups. The FT Raman spectroscopic results compared with the data obtained by elemental analysis enable not only qualitative verification of synthetic steps, but also a semiquantitative determination of covering of the silica gel surface by derivatization agent.

FT-Raman spectroscopy of the Christmas wreath lichen, Cryptothecia rubrocincta (Ehrenb.:Fr.) Thor

2005 ◽  
Vol 37 (2) ◽  
pp. 181-189 ◽  
Author(s):  
Howell G. M. EDWARDS ◽  
Luiz F. C. de OLIVEIRA ◽  
Mark R. D. SEAWARD
Keyword(s):  
Raman Spectroscopy ◽  
Calcium Oxalate ◽  
Major Axis ◽  
Calcium Oxalate Monohydrate ◽  
Calcium Oxalate Dihydrate ◽  
Spectral Signatures ◽  
Lichen Substances ◽  
Ft Raman Spectroscopy ◽  
Ft Raman

FT-Raman spectra have been obtained from the highly pigmented lichen Cryptothecia rubrocincta from a Brazilian vestigial rainforest habitat. Spectral signatures of the two main lichen substances, chiodectonic acid and confluentic acid, were identified in adjacent zones of the thallus. Of the characteristic zonal colours displayed by the thallus, the outer red zone contained chiodectonic acid and no calcium oxalate, and graded into by a pink zone with calcium oxalate monohydrate (whewellite) in association with chiodectonic acid, to the inside of which is a concentric white zone containing calcium oxalate dihydrate (weddellite); however, chemically differentiated sites (elliptical brown flecks with a major axis of c. 15 μm) in both the pink and red zones contained chiodectonic acid and calcium oxalate monohydrate. The role of Raman spectroscopy in the spatial identification of lichen substances in the thallial structures is demonstrated.

On-Line Monitoring of Airborne Chemistry in Levitated Nanodroplets:  In Situ Synthesis and Application of SERS-Active Ag−Sols for Trace Analysis by FT-Raman Spectroscopy

2003 ◽  
Vol 75 (9) ◽  
pp. 2166-2171 ◽  
Author(s):  
Nicolae Leopold ◽  
Michael Haberkorn ◽  
Thomas Laurell ◽  
Johan Nilsson ◽  
Josefa R. Baena ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Trace Analysis ◽  
In Situ Synthesis ◽  
Ft Raman Spectroscopy ◽  
On Line ◽  
Ft Raman

Application of FT-Raman spectroscopy to the study of selected organometallic complexes and proteins

1990 ◽  
Vol 68 (7) ◽  
pp. 1196-1200 ◽  
Author(s):  
Steven M. Barnett ◽  
François Dicaire ◽  
Ashraf A. Ismail
Keyword(s):  
Raman Spectroscopy ◽  
Near Infrared ◽  
Metal Carbonyl ◽  
Protein A ◽  
Organometallic Complexes ◽  
Laser Source ◽  
Chromium Tricarbonyl ◽  
Ft Raman Spectroscopy ◽  
Arene Chromium Tricarbonyl ◽  
Ft Raman

The study of colored organometallic complexes by dispersive Raman spectroscopy has been limited due to fluorescence or photodecomposition caused by the visible laser used as the excitation source. As a solution to this problem, FT-Raman spectroscopy with a near-infrared laser source has been useful in lowering fluorescence or photolysis in these samples. To investigate the utility of this technique, we have obtained and assigned the FT-Raman spectra of a series of arene chromium tricarbonyl complexes and of cyclopentadienyl manganese tricarbonyl. Some bands previously unobserved by dispersive Raman spectroscopy were seen, including a band assigned to a 13CO satellite in the spectrum of methylbenzoate chromium tricarbonyl. In addition, FT-Raman data for bovine serum albumin (BSA) and Protein-A are presented. Keywords: FT-Raman spectroscopy, metal carbonyl, proteins, organometallics, near infrared.

FT-Raman spectroscopy of titania hydrolysates

1997 ◽  
Vol 53 (7) ◽  
pp. 969-977 ◽  
Author(s):  
Paul A. Venz ◽  
Ray L. Frost ◽  
J.R. Bartlett ◽  
J.L. Woolfrey
Keyword(s):  
Raman Spectroscopy ◽  
Ft Raman Spectroscopy ◽  
Ft Raman
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