Heterogeneous Cu-Mn mixed oxides can mediate TEMPO-catalyzed selective oxidation of benzyl alcohol by molecular oxygen under neutral condition, and is recyclable. In the case of the molar ratio of Cu and Mn over 1, th...Heterogeneous Cu-Mn mixed oxides can mediate TEMPO-catalyzed selective oxidation of benzyl alcohol by molecular oxygen under neutral condition, and is recyclable. In the case of the molar ratio of Cu and Mn over 1, the highly-dispersed CuO inside the Cu-Mn mixed oxides is responsible for the good performances in catalytic oxidation.展开更多
An effective transition-metal-free catalytic system is developed for aerobic oxidations of alcohols. Using catalytic amount of bromide-bromate coupling, H2SO4, and NaNO2, together with 2,2,6,6-tetramethylpiperidine N-...An effective transition-metal-free catalytic system is developed for aerobic oxidations of alcohols. Using catalytic amount of bromide-bromate coupling, H2SO4, and NaNO2, together with 2,2,6,6-tetramethylpiperidine N-oxyl radical （TEMPO） in the presence of air, various alcohols could be converted into the corresponding aldehydes or ketones in good to excellent isolated yields under mild conditions.展开更多
AIM:To investigate the effects of the free radical scavenger bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl) decandioate(IAC) in the dextran sodium sulphate(DSS) experimental model of ulcerative colitis.METHODS:Colit...AIM:To investigate the effects of the free radical scavenger bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl) decandioate(IAC) in the dextran sodium sulphate(DSS) experimental model of ulcerative colitis.METHODS:Colitis was induced in Sprague Dawley male rats by administration of 5% DSS in drinking water.IAC(30 mg/kg,lipophilic or hydrophilic form) was administered daily(orally or ip) for 6 d until sacrifice.Colonic damage was assessed by means of indirect(Disease Activity Index score) and direct measures(macroscopic and microscopic scores) and myeloperoxidase(MPO)activity.Neutrophil infiltration within the tissue and glutathione S-transferase activity were also investigated.RESULTS:DSS-induced colitis impaired body weight gain and markedly increased all inflammatory parameters.Six-day treatment with lipophilic IAC significantly reduced intestinal damage caused by inflammation,induced a down-regulation in MPO activity(0.72 ± 0.12 and 0.45 ± 0.12 with lipophilic IAC po and ip,respectively,vs 1.10 ± 0.27 in untreated DSS colitis animals) and minimized DSS-induced neutrophil infiltration,while hydrophilic IAC administered orally did not ameliorate DSS-induced damage.CONCLUSION:These results support the hypothesis that reactive oxygen metabolites contribute to inflammation and that the radical scavenger IAC has therapeutic potential in inflammatory bowel disease.展开更多
基金the National Natural Science Foundation of China (No.20572102)
文摘Heterogeneous Cu-Mn mixed oxides can mediate TEMPO-catalyzed selective oxidation of benzyl alcohol by molecular oxygen under neutral condition, and is recyclable. In the case of the molar ratio of Cu and Mn over 1, the highly-dispersed CuO inside the Cu-Mn mixed oxides is responsible for the good performances in catalytic oxidation.
基金Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB0610000)the National Key R&D Program of China(No.2021YFA1500100)+2 种基金the National Natural Science Foundation of China(Nos.21821002,91956112,22101294)the Science and Technology Commission of Shanghai Municipality of Shanghai(Nos.21ZR1476500,20XD1425100)the Natural Science Foundation of Ningbo(No.2023J035)。
基金grants from National Natural Science Foundation of China，Program for Changjiang Scholars and Innovative Research Team in University
文摘An effective transition-metal-free catalytic system is developed for aerobic oxidations of alcohols. Using catalytic amount of bromide-bromate coupling, H2SO4, and NaNO2, together with 2,2,6,6-tetramethylpiperidine N-oxyl radical （TEMPO） in the presence of air, various alcohols could be converted into the corresponding aldehydes or ketones in good to excellent isolated yields under mild conditions.
基金Supported by A Grant from the University of Bologna (Ricerca Fondamentale Orientata)
文摘AIM:To investigate the effects of the free radical scavenger bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl) decandioate(IAC) in the dextran sodium sulphate(DSS) experimental model of ulcerative colitis.METHODS:Colitis was induced in Sprague Dawley male rats by administration of 5% DSS in drinking water.IAC(30 mg/kg,lipophilic or hydrophilic form) was administered daily(orally or ip) for 6 d until sacrifice.Colonic damage was assessed by means of indirect(Disease Activity Index score) and direct measures(macroscopic and microscopic scores) and myeloperoxidase(MPO)activity.Neutrophil infiltration within the tissue and glutathione S-transferase activity were also investigated.RESULTS:DSS-induced colitis impaired body weight gain and markedly increased all inflammatory parameters.Six-day treatment with lipophilic IAC significantly reduced intestinal damage caused by inflammation,induced a down-regulation in MPO activity(0.72 ± 0.12 and 0.45 ± 0.12 with lipophilic IAC po and ip,respectively,vs 1.10 ± 0.27 in untreated DSS colitis animals) and minimized DSS-induced neutrophil infiltration,while hydrophilic IAC administered orally did not ameliorate DSS-induced damage.CONCLUSION:These results support the hypothesis that reactive oxygen metabolites contribute to inflammation and that the radical scavenger IAC has therapeutic potential in inflammatory bowel disease.
