scholarly journals Herbal Medicine Characterization Perspectives Using Advanced FTIR Sample Techniques – Diffuse Reflectance (DRIFT) and Photoacoustic Spectroscopy (PAS)

2020 ◽  
Vol 11 ◽  
Author(s):  
Agnese Brangule ◽  
Renāte Šukele ◽  
Dace Bandere
Keyword(s):  
Herbal Medicine ◽  
Photoacoustic Spectroscopy ◽  
Diffuse Reflectance

Quantitative Analysis of Silica in Silica-Kaolin Mixtures by Photoacoustic and Diffuse Reflectance Spectroscopies

1992 ◽  
Vol 46 (11) ◽  
pp. 1719-1723 ◽  
Author(s):  
Raghoottama S. Pandurangi ◽  
Mohindar S. Seehra
Keyword(s):  
Quantitative Analysis ◽  
Photoacoustic Spectroscopy ◽  
Signal Intensity ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Ir Bands ◽  
Signal Saturation

The techniques of photoacoustic spectroscopy (PAS) and diffuse reflectance spectroscopy (DRS) are investigated for the quantification of silica using the IR bands at 1080,797,693, and 1875 cm−1. It is observed that, in both techniques, signal intensity increases linearly with mass initially. However, signal saturation sets in at much lower masses (>2 mg) in PAS than in DRS (>30 mg), showing that saturation is strongly technique dependent, in addition to having dependence on the absorptivity of the sample. These findings are applied to the quantification of silica in laboratory-generated silica-kaolin mixtures. It is shown that, with the use of the weaker band at 1875 cm−1 in DRS, satisfactory results for the quantification of silica are obtained.

In Situ Fourier Transform Infrared Diffuse Reflectance and Photoacoustic Spectroscopy Characterization of Sulfur-Oxygen Species Resulting from the Reaction of SO2 with CaCO3

1988 ◽  
Vol 42 (6) ◽  
pp. 945-951 ◽  
Author(s):  
Meg Martin Thompson ◽  
Richard Alan Palmer
Keyword(s):  
Fourier Transform ◽  
Photoacoustic Spectroscopy ◽  
Diffuse Reflectance ◽  
Fourier Transform Infrared ◽  
Oxygen Species ◽  
Ft Ir

Fourier transform photoacoustic and diffuse reflectance spectroscopies (FT-IR-PAS and -DRS) have been used in situ to monitor the reaction of SO2 (1.5% in N2) with particulate CaCO3 at temperatures up to 400°C (PAS) and 690°C (DRS). The PA spectra indicate that at 360°C SO2 is physisorbed on the CaCO3 surface. This species is readily desorbed by N2 purging. Under continuous SO2/N2 exposure at 400°C and above, the physisorbed species is shown by the DR data to be converted first to oxygen-bound and then to nonspecifically bound pyramidal SO3−. Reaction of the SO3= with SO2 to form SO4− begins at 400°C and is essentially complete at 690°C. The DR data further indicate that for the SO4−: (1) at temperatures between 400 and 640°C a monodentate C3 v species forms; (2) above 640°C the SO4− ion has nearly Td symmetry; and (3) upon subsequent cooling, the SO4− exhibits the characteristics of a chelating C2 v species.

The effect of the chinese herbal medicine Dai-Kenchu-To on intestinal blood flow

2001 ◽  
Vol 120 (5) ◽  
pp. A248-A248
Author(s):  
N KAWASAKI ◽  
K NARIAI ◽  
M NAKAO ◽  
K NAKADA ◽  
N HANYUU ◽  
...  
Keyword(s):  
Blood Flow ◽  
Herbal Medicine ◽  
Chinese Herbal Medicine ◽  
Intestinal Blood Flow ◽  
Chinese Herbal

Use of the photoacoustic spectroscopy in the investigation of biocompatible magnetic fluids

2005 ◽  
Vol 125 ◽  
pp. 27-30 ◽  
Author(s):  
J. G. Santos ◽  
L. B. Silveira ◽  
A. C. Oliveira ◽  
P. C. Morais
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Magnetic Fluids

IN VIVO PHOTOACOUSTIC SPECTROSCOPY OF THE SKIN

1983 ◽  
Vol 44 (C6) ◽  
pp. C6-413-C6-418 ◽  
Author(s):  
P. Poulet ◽  
J. Chambron
Keyword(s):  
Photoacoustic Spectroscopy
Sign in / Sign up

Export Citation Format

Share Document