Quality-assurance procedures and measurements for open-path FTIR spectroscopy

1997 ◽  
Author(s):  
Mathilde Douard ◽  
Juergen Zeutzius-Reitz ◽  
Torsten Lamp ◽  
Alexander Ropertz ◽  
Konradin Weber
Keyword(s):  
Quality Assurance ◽  
Ftir Spectroscopy ◽  
Open Path

scholarly journals The Influence of UV Radiation on the Degradation of Pharmaceutical Formulations Containing Quercetin

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5454
Author(s):  
Iwona Golonka ◽  
Stanisław Wilk ◽  
Witold Musiał
Keyword(s):  
Quality Assurance ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Decay Rate ◽  
Ftir Spectroscopy ◽  
Polyacrylic Acid ◽  
Decomposition Rate ◽  
Pharmaceutical Formulations ◽  
Polymeric Gels ◽  
The Stability

The aim of this study was to assess the photostability of quercetin in the presence of anionic and nonionic polymeric gels with varied compositions of an added component—glycerol. The samples were irradiated continuously at constant temperature. The stability of quercetin in solution and incorporated into the gels was evaluated by an UV-Vis spectrophotometer. FTIR spectroscopy (Fourier-transform infrared spectroscopy) was used to detect the changes in the structure of quercetin depending on the polymer used in the gel, and on the exposure time. Photostabilization is an important aspect of quality assurance in photosensitive compounds. The decomposition rate of quercetin in the ionic preparation of polyacrylic acid (PAA) with glycerol was 1.952·10−3 min−1, whereas the absence of glycerol resulted in a decay rate of 5.032·10−4 min−1. The formulation containing non-ionic methylcellulose resulted in a decomposition rate of quercetin in the range of 1.679·10−3 min−1. The decay rate of quercetin under light influence depended on the composition of the gel. It was found that the cross-linked PAA stabilized quercetin and the addition of glycerol accelerated the photodegradation.

Use of open-path FTIR spectroscopy to address air monitoring needs during site remediations

1999 ◽  
Vol 9 (3) ◽  
pp. 79-92 ◽  
Author(s):  
Timothy R. Minnich ◽  
Robert L. Scotto
Keyword(s):  
Ftir Spectroscopy ◽  
Air Monitoring ◽  
Open Path

New method for estimating greenhouse gas emissions from livestock buildings using open-path FTIR spectroscopy

2009 ◽  
Author(s):  
Susana Briz ◽  
José Barrancos ◽  
Dácil Nolasco ◽  
Gladys Melián ◽  
Eleazar Padrón ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
New Method ◽  
Gas Emissions ◽  
Open Path ◽  
Livestock Buildings

Field Assessment of a New Method for Estimating Emission Rates from Volume Sources Using Open-Path FTIR Spectroscopy

1996 ◽  
Vol 46 (2) ◽  
pp. 159-171 ◽  
Author(s):  
Stephen D. Picxof ◽  
Sushma S. Masemore ◽  
Wyn Lewis-Bevan ◽  
Eric S. Ringler ◽  
D. Bruce Harris
Keyword(s):  
Ftir Spectroscopy ◽  
New Method ◽  
Emission Rates ◽  
Open Path ◽  
Field Assessment

Remote sensing of carbon monoxide by open-path FTIR spectroscopy: comparison of different analysis techniques

2004 ◽  
Author(s):  
Susana Briz ◽  
Sarai Diez ◽  
Antonio J. de Castro ◽  
Fernando Lopez ◽  
Klaus Schafer
Keyword(s):  
Remote Sensing ◽  
Carbon Monoxide ◽  
Ftir Spectroscopy ◽  
Analysis Techniques ◽  
Open Path

scholarly journals Validation of a Method for Estimating Pollution Emission Rates From Area Sources Using Open-Path FTIR Spectroscopy and Dispersion Modeling Techniques

Air & Waste ◽  
1994 ◽  
Vol 44 (3) ◽  
pp. 271-279 ◽  
Author(s):  
Stephen D. Piccot ◽  
Sushma S. Masemore ◽  
Eric S. Ringler ◽  
Sridhar Srinivasan ◽  
David A. Kirchgessner ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Dispersion Modeling ◽  
Emission Rates ◽  
Pollution Emission ◽  
Open Path ◽  
Modeling Techniques
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