Biological activities of Solanum paludosum Moric. extracts obtained by maceration and supercritical fluid extraction

Solanum paludosum extracts obtained by maceration (SP-EtOH_CRUDE and SP-EtOH_MARC) and supercritical fluid extraction (SP-SFECO₂) were evaluated. Three extracts with distinct chromatographic profiles were obtained: SP-EtOH_CRUDE, with a complex phenolic composition; SP-SFECO₂, containing methoxylated flavonoids; and SP-EtOH_MARC, which bears mainly polar polyphenols. All extracts were strong antioxidants, as measured using the diphenylpicrylhydrazyl (DPPH) method, xanthine/xanthine oxidase/luminol and iron-induced lipid peroxidation systems. Extracts were also evaluated as modifiers of antibiotic activity in strains of Staphylococcus aureus expressing fluoroquinolone, macrolide and tetracycline efflux proteins. Despite their lack of antibacterial activity, all extracts were able to potentiate antibiotics activities by as much as eight fold. Both the maceration and supercritical fluid extraction processes were adequate to obtain extracts with different biological activities according to their patterns of phenolic compounds. The data suggest that S. paludosum could be a valuable source of antioxidants and putative efflux pumps inhibitors.     

In vitro antioxidant properties of different parts of pomegranate flowers

The present study was designed to compare the antioxidant capacity of 70% ethanol extracts of petal, stamen and receptacle of pomegranate flowers (PF) by DPPH, reducing power, hydroxyl radicals (OH), DNA degradation and DNA breaking assays, as well as the peroxide value (POV). The different parts of PF showed significant activities in all the free radical scavenging tests. Among the parts, receptacle exhibited the highest inhibition of 44.86%, 61.21% and 44.47% in DPPH, OH and DNA degradation assays, respectively, and 63.96% reduction of ferricyanide to give Prussian blue colored complex in reducing power assay at maximum concentration tested, and showed the lowest POV of 68.51 meq/kg in experimental model of soybean oil after 12 days. Protection against oxidative damage to DNA molecules of various parts of flower was confirmed visually by DNA breaking assay. Total phenolic contents of the parts of flower and peel and leaves were estimated by Folin–Ciocalteu method and receptacle was found to contain the highest amount (148.41 ± 6.25 mg/g) of phenolics among the parts of flower, but the phenolic content of flower (petal, stamen and receptacle) was lower than peel, higher than leaves. Linear correlation (R² = 0.7139–0.9987) between antioxidant potential of various parts in different assays and phenolic contents was observed. This preliminary study indicates the antioxidant activity of PF, and moreover the results showed correlation with the amount of phenolic content present in different parts. Therefore, all parts of PF could be considered as a significant natural antioxidant source.     

长春岭含水原油流变性研究

利用RV22型粘度计,模拟地层条件下流体状态,对长春岭107区和109区3个油样进行了试验研究,测量了不同温度、不同含水率下含水原油粘度,了解原油的流变性,研究结果表明含水原油粘度随含水率变化存在极大值（非乳化拐点）。结论可为油田的开发及原油集输提供科学依据。     

生活源废水污染控制与防治对策

阜新市既是资源型缺水城市,水源污染又较严重,需要加强水源的合理开发以及利用还有生活源废水污染严重地区的控制与防治工作,具有紧迫性和必要性。     

高浓碱装置中真空抽气系统的升级优化

高浓碱装置采用水环式机械真空泵在使用过程中检修频繁,检修费用高,改成水喷射真空器以后检修费用和运行费用大大降低。     

铈(Ⅲ)-组氨酸-邻菲啰啉三元配合物的合成及其电化学活性

在乙醇水溶液介质中,60℃水浴加热的条件下,合成了标题化合物.经络合滴定、摩尔电导、元素分析、红外光谱、紫外光谱、热重-差热和循环伏安等测试对配合物进行了表征,确定配合物的化学组成为:[Ce(Ⅲ)(His)3phen]Cl3·3H2O.重点通过循环伏安测定了配合物在玻碳工作电极上的电化学行为,在HAc-NaAc缓冲溶液...     

大鲵糖肽润肤霜的制备及性能评价

通过添加大鲵糖肽制备了润肤霜,探讨了大鲵糖肽的吸湿性与抗氧化性,大鲵糖肽润肤霜的抗紫外线性与豚鼠皮肤涂抹的变态反应。结果表明：在低湿度条件下,大鲵糖肽的吸湿率达3.8%,在高湿度条件下,大鲵糖肽的吸湿率达15.6%;羟基自由基清除率为50.85%;添加了大鲵糖肽在260～315 nm下具有较强紫外线吸收能力;涂抹大鲵糖肽润肤霜和大鲵糖肽的豚鼠皮肤没有出现任何的红斑和水肿,与对照组的豚鼠的皮肤一致。     

防霉剂对木塑复合材料吸水性能的影响研究

研究了防霉剂对木塑材料自身吸水性能的影响,以竹粉/高密度聚乙烯(HDPE)、木粉/HDPE为供试复合材料,通过向其中添加一定量的ZB-2335、WPC-GUARD及ZD-29E、ZD-4E四种防霉剂,测试不同防霉剂对木塑材料吸水性能的影响.结果表明:无论是在室温还是在60℃条件下,四种防霉剂均对竹粉/HDPE、木粉/HDPE复合材料的吸水性能无显著影响.向竹粉/HDPE、木粉/HDPE复合材料中加入不同用量的ZD-29E防霉剂,测试了ZD-29E防霉剂用量对木塑材料吸水性能的影响,结果表明:无论是在室温还是60℃条件下,不同用量ZD-29E防霉剂的加入,对供试木塑材料的吸水性能无显著影响.     

镧铕共掺TiO_2/复合白土光催化剂的合成及工业废水处理活性

以钛酸四正丁酯为原料,采用溶胶-微波法合成了La和Eu共掺型纳米TiO2粉体(La-Eu-TiO2),以甲基橙为模型污染物考察了掺杂量对光催化活性的影响。XRD分析表明,所得粉体均为锐钛矿相纳米TiO2,且La和Eu掺杂后纳米TiO2特征衍射峰宽化,强度降低;UV-vis吸收光谱表明,La和Eu掺杂后对光的吸收显著增强;光催化实验表明,La和Eu共掺杂能显著提高纳米TiO2的光催化活性,当La和Eu掺杂量分别为0.1%和0.25%时,纳米TiO2光催化剂具有较高的催化活性,自然光照下光催化氧化处理卷烟厂蒸叶车间废水,效果较好,废水COD去除率达到92.4%,且催化剂易沉降分离、重复使用性能稳定。     

稀土掺杂纳米TiO2光催化剂制备及其光催化性能

采用溶胶-微波法制备掺杂不同稀土元素纳米TiO2光催化剂,借助XRD和UV-Vis吸收光谱等手段对其进行表征.以甲基橙为模拟污染物,考察样品的光催化性能.结果表明,适量的La3+、Nd3+、Eu3+、Gd3+和Y3+掺杂可提高TiO2样品的光催化活性,最佳掺杂物质的量分数分别为0.1%、0.1%、0.3%、0.2%和0...