scholarly journals Detecting Chemical Molecular Structure Differences among Different Iranian Barley Cultivars Using Fourier Transform Infrared Spectroscopy

2014 ◽  
Vol 4 (1) ◽  
pp. 258-268 ◽  
Author(s):  
Hojjat Gholizadeh
Keyword(s):  
Molecular Structure ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Barley Cultivars

Difference in Molecular Structure of Rod and Cone Visual Pigments Studied by Fourier Transform Infrared Spectroscopy†

Biochemistry ◽  
2001 ◽  
Vol 40 (9) ◽  
pp. 2879-2886 ◽  
Author(s):  
Hiroo Imai ◽  
Takahiro Hirano ◽  
Hideki Kandori ◽  
Akihisa Terakita ◽  
Yoshinori Shichida
Keyword(s):  
Molecular Structure ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Visual Pigments

Fourier Transform Infrared Spectroscopy Evidence of the Nanoscale Structural Jump in Medium-Rank Tectonic Coal

2021 ◽  
Vol 21 (1) ◽  
pp. 636-645
Author(s):  
Xiaobing Zhang ◽  
Tianrang Jia ◽  
Hang Zhang ◽  
Yiwen Ju ◽  
Yugui Zhang
Keyword(s):  
Molecular Structure ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Structural Parameters ◽  
Fourier Transform Infrared ◽  
Structure Evolution ◽  
Side Chains ◽  
Aromatic System ◽  
Tectonic Coal

Coal is a pressure-sensitive organic rock. The effect of tectonism on the structural evolution of medium-rank coal has been confirmed by the change in the crystal state of tectonic coal, but the organic molecular level response has not been reported. In this paper, three sets of medium-rank tectonic coals and symbiotic nontectonic coals were selected. The distributions of their functional groups and their molecular structure evolution were assessed using Fourier Transform Infrared Spectroscopy (FTIR), and their structural parameters were determined from the curve-fitting analysis. The nanoscale structural jump characteristics and mechanisms of medium-rank tectonic coal were revealed. Compared with symbiotic nontectonic coal, tectonism accelerated the exfoliation of side chains (groups) in the macromolecular structure, enlarged the aromatic system, and removed the unstable groups such as associative hydrogen bonds at first, which indicated that the molecular structure of tectonic coal was affected by nanoscale deformation, showing obvious advanced evolution characteristics. For the fat coal, the removal of side chains (groups) during the formation of tectonic coal makes the aromatic ring condensation obvious. For the coking coal, the formation of tectonic coal is dominated by cycloaliphatic dehydrogenation and aromatization, accompanied by the condensation of the aromatic rings. The tectonic coal formed from lean coal shows obvious aromatization characteristics. The molecular depolymerization and chemical tailoring caused by tectonism promotes the removal of hydrophobic side chains (groups) and activates some polar structure sites in coal. It is considered that the nanoscale structural jump of medium-rank tectonic coal is the result of the competition between the aromatic system and aliphatic structures.

Using Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR FT-IR) to Study the Molecular Conformation of Parchment Artifacts in Different Macroscopic States

2013 ◽  
Vol 67 (2) ◽  
pp. 158-162 ◽  
Author(s):  
Lee Gonzalez ◽  
Matthew Wade ◽  
Nancy Bell ◽  
Kate Thomas ◽  
Tim Wess
Keyword(s):  
Molecular Structure ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Molecular Conformation ◽  
Chemical Change ◽  
Fourier Transform Infrared ◽  
Ft Ir ◽  
The Fourier Transform ◽  
The Relationship

Maintaining appropriate temperatures and relative humidity is considered essential to extending the useful life of parchment artifacts. Although the relationship between environmental factors and changes to the physical state of artifacts is reasonably understood, an improved understanding of the relationship between the molecular conformation and changes to the macroscopic condition of parchment is needed to optimize environmental conditions. Using Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR FT-IR) analysis, the conformation of the molecular structure in selected parchment samples with specific macroscopic conditions, typically discoloration and planar deformations (e.g., cockling and tearing), have been made. The results of this investigation showed that the Fourier transform infrared signal differs for parchment samples exhibiting different macroscopic conditions. In areas exhibiting planar deformation, a change in the Fourier Transform Infrared signal was observed that indicates unfolding of the molecular conformation. In comparison, the discolored samples showed a change in molecular conformation that indicates a chemical change within the collagen molecular structure. This paper discusses the possible causal associations and implications of these findings for the conservation and preservation of parchment artifacts.

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