Two-Dimensional Correlation Spectroscopy Analysis for the Recovery of Weak Bands from Time-Resolved Infrared Spectra of Single Cells

2010 ◽  
Author(s):  
Luca Quaroni ◽  
Elise Normand ◽  
Adriana Predoi-Cross ◽  
Brant E. Billinghurst
Keyword(s):  
Infrared Spectra ◽  
Single Cells ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Spectroscopy Analysis ◽  
Time Resolved

Using the power of C-13 NMR to interpret infrared spectra of soil organic matter: A two-dimensional correlation spectroscopy approach

2013 ◽  
Vol 66 ◽  
pp. 76-82 ◽  
Author(s):  
Mohsen Forouzangohar ◽  
Daniel Cozzolino ◽  
Ronald J. Smernik ◽  
Jeffrey A. Baldock ◽  
Sean T. Forrester ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Infrared Spectra ◽  
Correlation Spectroscopy ◽  
Two Dimensional

The use of two-dimensional spectroscopy to interpret the effect of temperature on the near infrared spectra of whisky

2020 ◽  
Vol 28 (3) ◽  
pp. 148-152 ◽  
Author(s):  
Ishita Joshi ◽  
Vi Khanh Truong ◽  
J Chapman ◽  
D Cozzolino
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Infrared Spectra ◽  
Near Infrared ◽  
Infrared Region ◽  
Correlation Spectroscopy ◽  
Alcoholic Beverages ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Near Infrared Spectra

The variations in temperature during the analysis of alcoholic beverages are of importance to develop protocols based on near infrared spectroscopy. The objective of this study was to evaluate the effect of increasing temperature on the near infrared spectra of whisky samples using two-dimensional correlation spectroscopy. Whisky samples from different commercial labels were analyzed at four different temperatures (25°C, 35°C, 45°C, and 55°C) using a UV–VIS–NIR instrument. Asynchronous and synchronous two-dimensional correlation spectroscopy was used to reveal the effect of temperature on the near infrared spectra of the samples. The results of this study indicated that temperatures between 40°C and 55°C alter absorption at specific wavelengths in the near infrared region of the whisky samples analyzed. The combination of near infrared spectroscopy with two-dimensional correlation spectroscopy has the potential to dramatically improve the efficiency of analytical laboratories, considering the range of data that can be collected.

Phase Angle Description of Perturbation Correlation Analysis and its Application to Time-Resolved Infrared Spectra

2007 ◽  
Vol 61 (8) ◽  
pp. 867-872 ◽  
Author(s):  
Shigeaki Morita ◽  
Masaru Tanaka ◽  
Isao Noda ◽  
Yukihiro Ozaki
Keyword(s):  
Correlation Analysis ◽  
Phase Angle ◽  
Infrared Spectra ◽  
Water Sorption ◽  
Time Lag ◽  
Relaxation Times ◽  
Correlation Spectroscopy ◽  
Data Set ◽  
Time Resolved ◽  
2D Correlation Spectroscopy

A method of spectral analysis, phase angle description of perturbation correlation analysis, is proposed. This method is based on global phase angle description of generalized two-dimensional (2D) correlation spectroscopy, proposed by Shin-ichi Morita et al., and perturbation-correlation moving-window 2D (PCMW2D) correlation spectroscopy, proposed by Shigeaki Morita et al. For a spectral data set collected under an external perturbation, such as time-resolved infrared spectra, this method provides only one phase angle spectrum. A phase angle of the Fourier frequency domain correlation between a spectral intensity (e.g., absorbance) variation and a perturbation variation (e.g., scores of the first principle component) as a function of spectral variable (e.g., wavenumber) is plotted. Therefore, a degree of time lag of each band variation with respect to the perturbation variation is directly visualized in the phase angle spectrum. This method is applied to time-resolved infrared spectra in the O–H stretching region of the water sorption process into a poly(2-methoxyethyl acrylate) (PMEA) film. The time-resolved infrared (IR) spectra show three broad and overlapping bands in the region. Each band increases toward saturated water sorption with different relaxation times. In comparison to conventional methods of generalized 2D correlation spectroscopy and global phase angle mapping, the method proposed in the present study enables the easier visualization of the sequence as a degree of phase angle in the spectrum.

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