scholarly journals Application of attenuated total reflection infrared spectroscopy in the study ofPeruphasma schulteidefensive secretion

2007 ◽  
Vol 21 (3) ◽  
pp. 169-176 ◽  
Author(s):  
Michael P. Mcleod ◽  
Aaron T. Dossey ◽  
M. Khalique Ahmed
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Natural Product ◽  
Short Communication ◽  
Defensive Secretion ◽  
Structural Characteristics ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Ft Ir ◽  
Ir Study

In this short communication, we present the first Fourier Transform Infrared Absorbance (FT-IR) study of peruphasmal; a defensive secretion fromPeruphasma schultei. The spectral data collected are representative of the natural product structure proposed by Dossey et al. This study demonstrates the viability of FT-IR as another tool in the physical and biological chemist's repertoire for use in determining important structural characteristics from minute amounts of available sample.

Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR FT-IR) Applied to Study the Distribution of Ink Components in Printed Newspapers

2016 ◽  
Vol 70 (9) ◽  
pp. 1537-1545 ◽  
Author(s):  
Nuria Gómez ◽  
Cristina Molleda ◽  
Ester Quintana ◽  
José M. Carbajo ◽  
Alejandro Rodríguez ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Thickness Distribution ◽  
Sheet Thickness ◽  
Fourier Transform Infrared ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Oil Percentage ◽  
Ft Ir

A new method was developed to study how the oil and cyan pigments of cold-set ink are distributed in newspaper thickness. The methodology involved laboratory printing followed by delamination of the printed paper. The unprinted side, printed side, and resulting layers were analyzed using attenuated total reflection Fourier transform infrared spectroscopy (ATR FT-IR). Three commercial newspapers and black and cyan cold-set inks were chosen for the study. Attenuated total reflection Fourier transform infrared spectroscopy enabled the proportion of oil and cyan pigment on the printed surface and throughout the sheet thickness to be measured. Oil percentage was evaluated as the area increment of the region from 2800 cm−1 to 3000 cm−1. The relative amount of cyan pigment was determined as the area of the absorption band at 730 cm−1. The ink oil was found mainly below half the paper thickness, whereas the pigment was detected at the layers closer to the printed surface, at a depth penetration of less than 15 µm (20% of thickness). Distribution of these two components in paper thickness depended on the type of cold-set ink, the amount of ink transferred, and the newspaper properties.

Determination of Triglycerides on Cotton Fabrics Using Fourier Transform Attenuated Total Reflection Infrared Spectroscopy

1985 ◽  
Vol 39 (6) ◽  
pp. 1047-1050 ◽  
Author(s):  
R. S. Shreedhara Murthy ◽  
D. E. Leyden ◽  
J. Keith Grime
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Cotton Fabric ◽  
Cotton Fabrics ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Triglycerides deposited on cotton fabric in the form of artificial body soil (ABS) were quantified with the use of ATR/FT-IR spectroscopy after ABS had been transferred onto the ATR crystal under pressure. This approach improved the signal-to-background ratio by avoiding interference from cellulose absorption, and improved precision as contact of the cloth sample with the ATR crystal was not necessary. ABS concentrations comparable to natural body soil levels were determined. This procedure was shown to be useful for following the depletion of “surface” ABS after different washing procedures.

Attenuated Total Reflection (ATR) Sampling in Infrared Spectroscopy of Heterogeneous Materials Requires Reproducible Pressure Control

2016 ◽  
Vol 71 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Zhenyu Lu ◽  
Brianna M. Cassidy ◽  
Stephanie A. DeJong ◽  
Raymond G. Belliveau ◽  
Michael L. Myrick ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Pressure Sensor ◽  
Pressure Control ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Precise Control ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy, in which the sample is pressed against an internal reflection element, is a popular technique for rapid IR spectral collection. However, depending on the accessory design, the pressure applied to the sample is not always well controlled. While collecting data from fabrics with heterogeneous coatings, we have observed systematic pressure-dependent changes in spectra that can be eliminated by more reproducible pressure control. We also described a pressure sensor adapted to work with an ATR tower to enable more precise control of pressure during ATR sampling.

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