scholarly journals A salt-bridge structure in solution revealed by 2D-IR spectroscopy

2014 ◽  
Vol 16 (30) ◽  
pp. 15784-15786 ◽  
Author(s):  
Adriana Huerta-Viga ◽  
Sérgio R. Domingos ◽  
Saeed Amirjalayer ◽  
Sander Woutersen
Keyword(s):  
Ir Spectroscopy ◽  
Spatial Structure ◽  
Ir Spectrum ◽  
Salt Bridge ◽  
Bridge Structure ◽  
2D Ir ◽  
Structure In Solution

We determine the spatial structure of a guanidinium:acetate salt bridge in solution from cross peaks in its 2D-IR spectrum.

scholarly journals RAPID INVESTIGATION OF THE METABOLITE CONTENT IN HIBISCUS SABDARIFFA var. UKMR-2 CULTIVATED UNDER THE INFLUENCE OF ELEVATED CO2 USING TRI-STEP FT-IR SPECTROSCOPY

2020 ◽  
Vol 83 (1) ◽  
pp. 75-83
Author(s):  
Siti Aishah Mohd Ali ◽  
Jalifah Latip
Keyword(s):  
Ir Spectroscopy ◽  
Elevated Co2 ◽  
Ir Spectrum ◽  
Food Authentication ◽  
2D Ir ◽  
Correlation Spectrum ◽  
Ft Ir ◽  
Metabolite Content ◽  
Co2 Treatment ◽  
Ft Ir Spectroscopy

Rapid methods based on untargeted analysis technique such as Fourier Transform Infrared (FT-IR) spectroscopy can provide much faster and easier solution for food authentication. However, studies on the metabolite content in UKMR-2 calyces using FT-IR spectroscopy has not been reported yet in any previous studies. Thus, the present study was performed to analyze the differences in metabolite content in UKMR-2 calyces under the influences of different [CO2] treatment by applying tri-step infrared based fingerprinting. The UKMR-2 plant cultivation was exposed to ambient [CO2] (400 µmol/mol) and elevated [CO2] (800 µmol/mol) treatment. The UKMR-2 calyx extracts were analysed by conventional infrared (1D-IR), second derivative infrared (SD-IR) and two-dimensional correlation infrared (2D-IR) spectroscopy. The 1D-IR spectrum results revealed a similar absorption spectrum in the range of 1900 - 650 cm-1, which suggest similar major metabolites content present in both extracts. For SD-IR spectrum, both treatments clearly showed have more peaks with different shape, position and intensity in the range of 1650 - 1450 cm-1 and 1200 - 950 cm-1, which is likely to have different flavonoid and carbohydrate content in UKMR-2 calyces. The 2D-IR synchronous correlation spectrum in the range of 1000 – 650 cm-1 clearly distinguished the metabolite content in the UKMR-2 calyx extract from different [CO2] treatment. Therefore, this tri-step infrared based fingerprinting has the potential as one of the effective methods to discriminate extract samples with similar infrared fingerprint features and indicate that the metabolite content in UKMR-2 calyces were influenced by different [CO2] treatments.

Two-dimensional IR spectroscopy reveals a hidden Fermi resonance band in the azido stretch spectrum of β-azidoalanine

2020 ◽  
Vol 22 (34) ◽  
pp. 19223-19229
Author(s):  
Jun Young Park ◽  
Hyeok-Jun Kwon ◽  
Saptarsi Mondal ◽  
Hogyu Han ◽  
Kyungwon Kwak ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Ir Spectrum ◽  
Resonance Peak ◽  
Cross Peak ◽  
Fermi Resonance ◽  
Two Dimensional ◽  
2D Ir ◽  
Resonance Band

The 2D-IR spectrum of Ala-N3 shows cross-peak, but cannot be identified clearly. The 1D slice spectra obtained from 2D-IR spectrum reveals the presence of hidden Fermi resonance peak.

scholarly journals Needles in a haystack: H-bonding in an optogenetic protein observed with isotope labeling and 2D-IR spectroscopy

2021 ◽  
Author(s):  
Jeannette Ruf ◽  
Peter Hamm ◽  
David Buhrke
Keyword(s):  
Ir Spectroscopy ◽  
Isotope Labeling ◽  
Vibrational Modes ◽  
2D Ir

Two vibrational modes in a cyanobacterial protein were isolated with isotope labeling and studied with 2D-IR spectroscopy.

scholarly journals Transparent window 2D IR spectroscopy of proteins

2021 ◽  
Vol 155 (4) ◽  
pp. 040903
Author(s):  
Megan C. Thielges
Keyword(s):  
Ir Spectroscopy ◽  
2D Ir

scholarly journals Structure Changes of a Membrane Polypeptide under an Applied Voltage Observed with Surface-Enhanced 2D IR Spectroscopy

2021 ◽  
Vol 12 (7) ◽  
pp. 1786-1792
Author(s):  
Erin R. Birdsall ◽  
Megan K. Petti ◽  
Vivek Saraswat ◽  
Joshua S. Ostrander ◽  
Michael S. Arnold ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Applied Voltage ◽  
2D Ir ◽  
Structure Changes ◽  
Surface Enhanced

Determination of storage stability of the crude extracts of Ganoderma lucidum using FTIR and 2D-IR spectroscopy

2011 ◽  
Author(s):  
Yew Keong Choong ◽  
Su-Qin Sun ◽  
Qun Zhou ◽  
Zakiah Ismail ◽  
Badrul Amini Abdul Rashid ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Ganoderma Lucidum ◽  
Storage Stability ◽  
2D Ir ◽  
Crude Extracts

Structural Studies of Some o- and p-Nitrophenylcarbamates by IR Spectroscopy and X-Ray Diffraction

2008 ◽  
Vol 63 (12) ◽  
pp. 1402-1406
Author(s):  
Monika Simon ◽  
Carol Csunderlik ◽  
G. Jones
Keyword(s):  
Ir Spectroscopy ◽  
Crystal Structures ◽  
Ir Spectrum ◽  
Structural Studies ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
X Ray

N-Alkyl-o-nitrophenylcarbamates as solids present two carbonyl stretching bands in the region 1700 - 1800 cm−1 but similar N-alkyl-p-nitrophenylcarbamates have only one such band in the IR spectrum. In solution both kinds of carbamate present one carbonyl stretching band, but for the former, the splittings occur when the carbamates crystallize. Four crystal structures were analyzed by X-ray diffraction. The two ortho derivatives have more than one molecule in the asymmetric unit, which is consistent with the IR observations.

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