Degradation kinetics and mechanism of pentoxifylline by ultraviolet activated peroxydisulfate

Kaminska B.; Majewska K.; Skwierawska A.; Kozlowska-Tylingo K.

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Degradation kinetics and mechanism of pentoxifylline by ultraviolet activated peroxydisulfate

机译：紫外线活性过氧二硫酸盐的紫外线活化碱的降解动力学和机理

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Degradation of pentoxifylline (PTX) by sodium peroxydisulfate (SPDS) assisted by UV irradiation has been investigated in deionized water. The treatment was more favorable over direct photolysis or peroxydisulfate oxidation alone. The effects of various parameters, including different dosage of oxidant agent, PTX concentration, initial solution pH levels, and the presence of inorganic ions like chloride, nitrate and carbonate have been evaluated. The rate of PTX decomposition depends on the oxidant agent dose. The highest degradation was determined at pH 10.5, which can be explained by the generation of additional hydroxyl radicals (HO) in the reaction between sulfate radicals and hydroxide ions. The presence of inorganic ions, especially the carbonate ions quench valuable sulfate radicals and have successfully retarded the PTX decomposition. Six PTX oxidation products were identified using UPLC-QTOF-MS for trials in a basic environment. The main degradation product (3,7-dimethyl-6-(5-oxohexyloxy)-3,7-dihydro-2H-purin-2-one) was isolated by column chromatography and identified by (HNMR)-H-1 and LC MS analyzes.

机译：在去离子水中研究了通过UV辐射辅助的过氧氢硫酸钠（SPD）的戊氧化碱（PTX）的降解。单独的直接光解或过氧硫酸盐氧化更有利。已经评估了各种参数的影响，包括不同剂量的氧化剂剂，PTX浓度，初始溶液pH水平和氯化物，硝酸盐和碳酸酯的无机离子的存在。 PTX分解的速率取决于氧化剂剂量。在pH105下测定最高的降解，其可以通过在硫酸盐基团和氢氧化物离子之间的反应中产生另外的羟基自由基（HO）来解释。无机离子的存在，特别是碳酸酯离子淬灭有价值的硫酸盐，并成功地延迟了PTX分解。使用UPLC-QTOF-MS鉴定六种PTX氧化产物，以在基本环境中试验。通过柱色谱法分离出主要的降解产物（3,7-二甲基-6-（5-氧己氧基）-3,7-二氢-2H-五林-2-1），并通过（HNMR）-H-1和LC鉴定MS分析。

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《RSC Advances》 |2018年第42期|共9页
作者
Kaminska B.; Majewska K.; Skwierawska A.; Kozlowska-Tylingo K.;
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Gdansk Univ Technol Dept Chem &

Technol Funct Mat Narutowicza 11-12 PL-80233 Gdansk Poland;

Gdansk Univ Technol Dept Chem &

Technol Funct Mat Narutowicza 11-12 PL-80233 Gdansk Poland;

Gdansk Univ Technol Dept Chem &

Technol Funct Mat Narutowicza 11-12 PL-80233 Gdansk Poland;

Gdansk Univ Technol Dept Pharmaceut Technol &

Biochem Narutowicza 11-12 PL-80233 Gdansk Poland;

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7. Degradation kinetics and mechanism of pentoxifylline by ultraviolet activated peroxydisulfate [O] . B. Kamińska, K. Majewska, A. Skwierawska, 2018

机译：紫外线活性过氧二硫酸盐的紫外线活化碱的降解动力学和机理

Degradation kinetics and mechanism of pentoxifylline by ultraviolet activated peroxydisulfate

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