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Search for "photodegradation" in Full Text gives 31 result(s) in Beilstein Journal of Organic Chemistry.
Photo, thermal and chemical degradation of riboflavin
Beilstein J. Org. Chem. 2014, 10, 1999–2012, doi:10.3762/bjoc.10.208
- general scheme for the photodegradation of RF is presented. Keywords: chemical degradation; degradation products; photodegradation; riboflavin; stability; thermal degradation; Review The study of photo, thermal and chemical degradation in the stability of drugs is one of the most concerned areas in the
- degradation products which could be harmful to the human body. However, not every drug shows similar behavior when exposed to unfavorable conditions, e.g., nifedepine [2] and cyanocobalamin [3] degrade rapidly on exposure to light whereas ephedrine [4] shows a slower rate of photodegradation. Information
- [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Some of the products reported earlier [14][20][34] still need to be identified. In the presence of divalent anions, such as phosphate (HPO42–) and sulfate (SO42–), the photodegradation of RF leads to the formation of
Studies on the photodegradation of red, green and blue phosphorescent OLED emitters
Beilstein J. Org. Chem. 2013, 9, 2088–2096, doi:10.3762/bjoc.9.245
- Susanna Schmidbauer Andreas Hohenleutner Burkhard Konig Institut für Organische Chemie, Universität Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany 10.3762/bjoc.9.245 Abstract The photodegradation behavior of four well-established iridium emitters was investigated. Irradiation of
- solvents are discussed for the different investigated iridium complexes. Some of the resulting degradation products could be identified by using LC–MS or other analytical techniques. The results show how even small structural changes can have a huge influence on rate and mechanism of the photodegradation
- states that are accessible via annihilation reactions [14][15] or thermal population [16]. Investigations on the photodegradation of these compounds could therefore potentially provide valuable information on the processes that are responsible for the limited stability of phosphorescent OLEDs. In a
Damage of polyesters by the atmospheric free radical oxidant NO3•: a product study involving model systems
Beilstein J. Org. Chem. 2013, 9, 1907–1916, doi:10.3762/bjoc.9.225
- these materials. Is it possible that such reactions could lead to structural modifications in the polymer that may render the material more susceptible to further damage, for example through photodegradation and/or autoxidation? To our knowledge, the role of environmental free-radical oxidants as
Cyclodextrin-based nanosponges as drug carriers
Beilstein J. Org. Chem. 2012, 8, 2091–2099, doi:10.3762/bjoc.8.235
- industry. Its application is limited by its high instability and photodegradation. Gamma-oryzanol was encapsulated in nanosponges, showing a good protection from photodegradation. A gel and an O/W emulsion were formulated with the gamma-oryzanol-loaded nanosponges [49]. In vitro permeability and
Ratiometric fluorescent probe for enantioselective detection of D-cysteine in aqueous solution
Beilstein J. Org. Chem. 2011, 7, 1508–1515, doi:10.3762/bjoc.7.176
- documented [22][23][24][25][26][27][28]. As an improved sensing device, a ratiometric fluorescence probe monitors the emission intensities at two different wavelengths, which should provide a built-in correction for instrumental defects and photodegradation of sensing materials. In this context, a few
Green oxidations: Titanium dioxide induced tandem oxidation coupling reactions
Beilstein J. Org. Chem. 2009, 5, No. 24, doi:10.3762/bjoc.5.24
- absorbers in sunscreen lotions [3]. Its popularity stems from its inertness, low cost, and chemical stability under irradiation [4]. In the laboratory, its utility has been extended to the photodegradation of pesticides [5] and carcinogenic dyes [6], to sterilization against bacteria [7]. From a synthetic
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