- TiO2 photocatalysis of 2-isopropyl-3-methoxy pyrazine taste and odor compound in aqueous phase: Kinetics, degradation pathways and toxicity evaluation
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In recognition of the growing demand regarding the control of undesired taste and odor (T&O) problems in natural water resources, the photocatalytic degradation of 2-isopropyl-3 methoxy pyrazine (IPMP), a common metabolite of soil actinomycetes which contributes a rotten vegetable odor to water, was investigated under simulated solar irradiation. Under the studied conditions (C = 10 mg L-1, CTiO2 = 100 mg L-1and I = 600 W m-2), 95% of IPMP was removed within 20 min of irradiation. The reaction intermediates were completely mineralized to CO2 and the nitrogen was predominantly released as NH4+ ions after 240 min irradiation. The major transformation products of TiO2 photocatalysis of IPMP have been determined by the use of high resolution accurate liquid chromatography-orbitrap mass spectrometry as well as gas chromatography-mass spectrometry (GC-MS) techniques. Hydroxylation of the isopropyl and methoxy groups has been identified as the main reaction pathway. Scavenging experiments indicated the important role of HO?, h+ and O2?- in the photocatalytic process. Toxicity assessment revealed the efficiency of the photocatalytic treatment to achieve almost complete detoxification of the irradiated solution.
- Antonopoulou,Konstantinou
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- Preparation of labelled 2-methoxy-3-alkylpyrazines: Synthesis and characterization of deuterated 2-methoxy-3-isopropylyrazine and 2-methoxy-3-isobutylpyrazine
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Efficient synthetic routes for a number of deuterated analogues of 2-methoxy-3-isopropylpyrazines and 2-methoxy-3-isobutylpyrazines have been developed involving the condensation of glyoxal with an α-amino acid amide followed by methylation with iodomethane. In this way [2H3]2-methoxy-3-isopropylpyrazine, 2-methoxy-3-isopropyl-[2H2]pyrazine, [2H3]2-methoxy-3-isopropyl- [2H2]pyrazine, [2H3]2-methoxy-3-isobutylpyrazine; 2-methoxy-3-isobutyl-[2H2]pyrazine and [2H3]2-methoxy-3-isobutyl- [2H2]pyrazine were prepared and characterized by NMR and MS. Copyright
- Gerritsma, David A.,Brindle, Ian D.,Jones, Timothy R.B.,Capretta, Alfredo
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p. 243 - 253
(2007/10/03)
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