3-O-Alkylascorbic acids as free-radical quenchers: synthesis and inhibitory effect on lipid peroxidation
摘要:
A novel series of 3-O-alkylascorbic acids (3-RASA, 3a-n) was synthesized to act as radical scavengers for active oxygen species and free radicals, and their redox potentials and inhibitory effects on lipid peroxidation in rat liver microsomes were evaluated. The redox potentials of the 3-RASA compounds were increased by the substituent group to 90-190 mV above the potential for ascorbic acid (i.e., 3-RASA compounds were harder to oxidize). Although 3-O-dodecylascorbic acid (3c) and 3-O-(decylcarbomethyl)ascorbic acid (3i) differed in their redox potentials, they both markedly inhibited lipid peroxidation in rat liver microsomes to a similar extent (IC50 = 3.1 and 3.3 x 10(-6) M, respectively). Structure-activity relationship studies demonstrated that the anti lipid peroxidation activity of the 3-RASA compounds was markedly dependent upon their hydrophobicity.
[EN] ANTIMICROBIAL COMPOUNDS AND USES THEREOF<br/>[FR] COMPOSÉS ANTIMICROBIENS ET LEURS UTILISATIONS
申请人:JAWAHARLAL NEHRU CENTRE FOR ADVANCED SCIENT RESEARCH
公开号:WO2021199082A1
公开(公告)日:2021-10-07
The present disclosure relates to compounds of Formula I, II, III or its stereoisomers, polymorphs, solvates, hydrates, intermediates, and pharmaceutically active derivatives thereof. The present disclosure relates to a process of preparing the compounds of Formula I, II or III. The present disclosure further relates to an antimicrobial composition comprising the compounds of Formula I, II or III and method of forming an antimicrobial composition thereof. The present disclosure also relates to a method of treating a microbial infection.
Phase Transfer Catalysis with Quaternary Ammonium Type Gemini Surfactants: O-Alkylation of Isovanillin
作者:Mesut Boz、Sedat Semih Baştürk
DOI:10.1007/s11743-016-1821-z
日期:2016.7
alkylation of isovanillin with alkyl halide was successively carried out in the presence of potassium carbonate and a phasetransfercatalyst in tetrahydrofuran. The same reactions were also performed with both the traditional phasetransfercatalyst tetrabutylammonium bromide and without any catalyst. The results were compared with those of dimeric surfactants. Consequently, it was expressed that alkandiyl‐α
<i>Retracted</i>
: Synthesis, Characterization, and Surface Activities of Polymeric Cationic Thiol Surfactants in Aqueous Medium
作者:Mohamed F. Zaky、Ibrahim A. Sabbah、Mostafa E. Hendawy、Reda S. Abdel Hameed、Nabel A. Negm
DOI:10.1002/jsde.12233
日期:2019.3
including: surface tension (γ), effectiveness ( πcmc), concentration at micelle formation (CMC), efficiency (Pc20), maximum concentration at the interface (Γmax), and the average area occupied by each surfactant molecule at the interface at equilibrium ( A min) of surfactants solutions were established at 25°C. The surface tension and the critical micelle concentration values of the prepared surfactants were
通过将溴乙酸烷基酯(即:溴乙酸辛酯,癸基,十二烷基,十四烷基,十六烷基和十八烷基)作为季铵化剂反应,合成了一系列阳离子聚氨酯表面活性剂[PQ 8-18 ]。胺类。通过甲苯二异氰酸酯(TDI)和三乙醇胺单体巯基乙酸酯的反应制备改性的聚氨酯。使用元素分析,傅立叶变换红外光谱(FTIR)和质子核磁共振来确认所制备表面活性剂的化学结构(11 H NMR)光谱。所制备聚合物的分子量测量表明,每种聚合物的链段平均含有10个单位的氨基甲酸乙酯-三乙醇胺巯基乙酸酯。所制备的表面活性剂包括以下表面活性:表面张力(γ),效率(π CMC),浓度在胶束形成(CMC),效率(PC 20),最大浓度在界面(Γ最大),和平均面积占用通过每个表面活性剂分子在平衡界面处(A min )的表面活性剂溶液在25°C下建立。制备的表面活性剂的表面张力和临界胶束浓度值随着其烷基链长度的逐渐增加而逐渐降低。所制备的阳离子表面活性剂