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丹皮酚衍生物抗氧化活性研究 总被引:1,自引:0,他引:1
以丹皮酚和有机胺以及多种金属化合物为主要原料,合成11种丹皮酚衍生物。通过DPPH.分析法,研究了目标产物的抗氧化性。结果表明,目标产物有一定抗氧化活性,但清除自由基能力都比较弱。 相似文献
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以丹皮酚和乙二胺为原料合成席夫碱,经硼氢化钠还原得标题化合物,收率为67.2%;通过元素分析以及红外波谱对标题化合物进行表征。使用Hyperchem7.0程序,用半经验方法计算了化合物分子中能量分布、主要键长、键角以及主要原子的净电荷分布。计算结果分析表明,分子中主要原子之间的键长、键角基本在正常的范围内;负电荷主要集中于氧原子和氮原子上,分子呈现最优化的结构并具体一定的稳定性。 相似文献
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利用微量肉汤稀释法测定3-对烯-1-胺(1)及其席夫碱衍生物(2a~2l)对革兰氏阳性菌金黄色葡萄球菌、革兰氏阴性菌肺炎克雷伯氏菌及真菌白色念珠菌的抑菌活性,并讨论了构效关系。结果表明:3-对烯-1-胺及其部分席夫碱衍生物对这3种菌具有一定的抑菌活性,其中化合物1对金黄色葡萄球菌的抑菌活性最强,最小抑菌浓度(MIC)值为56.25 mg/L;化合物2h和2i对肺炎克雷伯氏菌的抑菌活性最强,MIC值均为112.5 mg/L;化合物2l对白色念珠菌的抑菌活性最强,MIC值为28.125 mg/L。构效关系分析结果表明:向3-对烯-1-胺席夫碱衍生物中引入Br、Cl等卤素后,能显著增强抑菌活性;含有吡啶环的3-对烯-1-胺席夫碱衍生物对真菌白色念珠菌的抑菌活性明显要高于含呋喃环、吡咯环或噻吩环的3-对烯-1-胺席夫碱衍生物。 相似文献
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以丹皮酚和脂肪胺为主要原料,合成9种Schiff碱化合物,并对标题化合物进行表征。利用细菌作为生物指示,采用琼脂扩散法测定了目标产物的抑菌性能;通过DPPH.分析法,测定了目标产物的抗氧化性。结果表明:目标产物对所受试菌种都有一定的抑制作用,但其清除自由基能力比较弱。 相似文献
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Chitosan, a biocompatible, biodegradable, nontoxic polymer, is prepared from chitin, which is the second most naturally occurring biopolymer after cellulose. Schiff base of chitosan, sorbyl chitosan, and p‐aminobenzoyl chitosan were synthesized working under high‐intensity ultrasound and their antimicrobial properties were analyzed against Escherichia coli, Staphylococcus aureus, and Aspergillus niger. The structures of the derivatives were characterized by FTIR spectroscopy and elemental analysis. The results of antimicrobial activities indicated that the antimicrobial activities of the derivatives increased with increasing the concentration. The antibacterial activity of schiff base of chitosan against E. coli was stronger, while acylated chitosan had better inhiting effect on S. aureus than others. It was also found that the antifungal activities of the derivatives were stronger than that of chitosan, and schiff base of chitosan was obviously superior to acylated chitosan. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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合成了二硫代肼基甲酸镉与镍的配合物以及由二硫代肼甲酸与环己酮1,4-双(2’-甲酰基苯基)-1,4-二氧杂丁烷缩合的两种新的含硫席夫碱衍生物,所有化合物都进行了表征,确定了它们的组成,且对两种席夫碱衍生物的性质进行了初步研究。 相似文献
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以D-氨基葡萄糖盐酸盐与对甲氧基苯甲醛、对甲基苯甲醛反应合成了两种新的D-氨基葡萄糖席夫碱(对甲氧基苯甲醛缩D-氨基葡萄糖席夫碱、对甲基苯甲醛缩D-氨基葡萄糖席夫碱),收率分别为67.9%、74.6%。使用UV1、HNMR和IR对产物进行了结构表征。测试了两种席夫碱甲醇饱和溶液对香蕉炭疽病菌、芒果炭疽病菌、芒果蒂腐病菌、芒果焦腐病菌、番木瓜炭疽病菌等植物病原真菌的抑菌性能。结果表明,对甲氧基苯甲醛缩D-氨基葡萄糖席夫碱对香蕉炭疽病菌、芒果蒂腐病菌、芒果焦腐病菌具有很强的抑菌活性,对甲基苯甲醛缩D-氨基葡萄糖席夫碱对香蕉炭疽病菌、芒果炭疽病菌具有很强的抑菌活性。 相似文献
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以壳聚糖和对二甲氨基苯甲醛为原料合成壳聚糖希夫碱,以壳聚糖希夫碱为底物,采用反相悬浮聚合法,制备壳聚糖希夫碱微球。对二者的吸附性能进行比较研究。结果表明,希夫碱微球的吸附性能优于壳聚糖希夫碱,对四氧化三铁的吸附容量分别为113.179 mg/g和39.279 mg/g,对亚甲基蓝的吸附平衡时间均为150 min,饱和吸附容量随着亚甲基蓝初始质量浓度的增大而增大,且微球的吸附容量大于壳聚糖希夫碱,吸附率不随浓度增大单调递增,而是有一极大值。 相似文献
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Monomeric Schiff base derived from salicylaldehyde and 1,3‐diaminopropane was subjected to polycondensation reaction with formaldehyde and piperazine in basic medium. The resin was found to form polychelates readily with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) metal ions. The materials were characterized by elemental analysis, spectral studies (IR, 1H‐NMR, 13C‐NMR, and UV–visible), magnetic moment measurements, and thermal analysis. The electronic spectra and magnetic moment measurements of the synthesized polychelates confirmed the geometry of the central metal ion. Metal–resin bonds were registered in the IR spectra of the polychelates. The thermogravimetric analysis data indicated that the polychelates were more stable than the corresponding polymeric Schiff base. All the synthesized metal–polychelates showed excellent antibacterial activities against the selected bacteria. The antimicrobial activities were determined by using the shaking flask method, where 25 mg/mL concentrations of each compound were tested against 105 CFU/mL bacteria solutions. The number of viable bacteria was calculated by using the spread‐plate method, where 100 μL of the incubated antimicrobial agent in bacteria solutions were spread on agar plates, and the number of bacteria was counted after 24 h of incubation period at 37°C. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献