photooxidation


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photooxidation

(ˌfəʊtəʊˌɒksɪˈdeɪʃən)
n
1. (General Physics) physics the loss of an electron due to photoexcitation
2. (Chemistry) chem something's reaction with oxygen caused by light
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References in periodicals archive ?
Sidrach, Flow injection Fluorimetric determination of ascorbic acid based on its photooxidation by thionine blue, Analyst, 122, 115 (1997).
* Mercury-free tap-to-ultrapure water system with built-in ech2o UV lamps for the photooxidation of organic contaminants and inactivation of bacteria
Squalene monohydroperoxide is comedogenic and results from ultraviolet A-triggered photooxidation of squalene in sebum.
The initiation step consists in the formation of free radicals (R*) (Reaction (1)) mainly by the action of temperature (thermooxidation) or by the action of ultraviolet (UV) radiation (photooxidation).
Ozone, UV rays, and cigarette smoke are oxidizing agents of SQ; photoluminescence studies with mass spectrometry (NMR) have elucidated that SQ double bonds react with oxygen on the surface of the skin and prevent photooxidation by the rays [37].
These results are in agreement with those reported by Laycock et al., since they reported that crystallinity tends to increase at the early stages of PE photooxidation [18].
In this matter, the use of photocatalysis beyond organic compound removal has been also demonstrated but the oxidations were selectively conducted, achieving the selective production of formaldehyde from the photooxidation of methanol.
The TC: TH ratios are determined by the formation of a certain amount of TC on the photooxidation of a fixed amount of TH under controlled experimental conditions (i.e., concentration of TH, concentration of oxidizing agent, pH of the solution, irradiation source, and irradiation time).
The process of filling a fermentation tank with cucumbers would result in a short period of sun exposure time, and it maybe enough to initiate photooxidation. Eisenstat and Fabian [44] also found that exposure to Ca[Cl.sub.2] could cause slight bleaching of cucumbers in jars exposed to diffused light which is consistent with the overall lower chroma value of the cucumbers fermented in Ca[Cl.sub.2] brines (Figure 8).
Previous studies noticed that it inhibits the photooxidation of RPE cells via facilitating the regeneration of rhodopsin in rod photoreceptors [19, 20].