High-precision methane isotopic abundance analysis using near-infrared absorption spectroscopy at 100 Torr

The Analyst ◽  
2021 ◽  
Author(s):  
Zhiwei Liu ◽  
Chuantao Zheng ◽  
Tianyu Zhang ◽  
Yu Zhang ◽  
Yiding Wang ◽  
...  
Keyword(s):  
High Precision ◽  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Sensor System ◽  
Infrared Absorption Spectroscopy ◽  
Isotopic Abundance ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Carbon Isotopic

A near-infrared methane (CH4) sensor system for carbon isotopic abundance analysis was developed based on laser absorption spectroscopy (LAS).

Near-infrared absorption spectroscopy of interstellar hydrocarbon grains

1994 ◽  
Vol 437 ◽  
pp. 683 ◽  
Author(s):  
Y. J. Pendleton ◽  
S. A. Sandford ◽  
L. J. Allamandola ◽  
A. G. G. M. Tielens ◽  
K. Sellgren
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Infrared Absorption Spectroscopy

scholarly journals Comparison of the Properties of Brand-Name and Generic Nadifloxacin Creams

Medicina ◽  
2011 ◽  
Vol 47 (11) ◽  
pp. 89
Author(s):  
Yutaka Inoue ◽  
Miruto Matsumoto ◽  
Masayuki Kimura ◽  
Toru Tanaka ◽  
Ikuo Kanamoto
Keyword(s):  
Water Content ◽  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Generic Drugs ◽  
Infrared Absorption Spectroscopy ◽  
Brand Name ◽  
Yield Value ◽  
Lower Viscosity ◽  
Brand Name Drugs

Background and Objective. In external preparations, types and ratios of additives are not necessarily the same for brand-name drugs and generic drugs. Thus, the physicochemical properties of preparations may differ despite the fact that they contain the same ingredients or additives. This study examined differences in brand-name and generic versions of nadifloxacin (NFX) creams. Material and Methods. Three types of NFX creams (NFX-A, NFX-B, and NFX-C) were used. The viscosity of each preparation was determined, its yield value was calculated, and each preparation was subjected to light microscopy, x-ray powder diffraction, and near-infrared absorption spectroscopy. Results. Comparison of viscosity of different preparations revealed that NFX-B had a lower viscosity than NFX-A and NFX-C (14.5 vs. 24.6 and 17.9 Pa·s). NFX-B also had a lower yield value than NFX-A and NFX-C. Microscopy revealed that NFX-A and NFX-B had satisfactory emulsification although crystallization was observed with NFX-C. Near-infrared absorption spectroscopy revealed changes in the absorption spectra of NFX-B in comparison with those of NFX-A and NFX-C that were due to differences in water content and differences in fat and oil content. Conclusions. These findings confirmed that there were differences in the viscosity and flattening of NFX-A, NFX-B, and NFX-C. In addition, microscopy revealed differences in emulsification and it revealed the precipitation of NFX crystals in NFX-C. Near-infrared absorption spectroscopy revealed that differences in the type and amount of additives and water content in the creams had contributed to differences in the preparations.

Sign in / Sign up

Export Citation Format

Share Document