Antioxidant and free radical scavenging activities of pigments extracted from molasses alcohol wastewater

The pigments from molasses alcohol wastewater were extracted by the macroporous resin adsorption method. The antioxidant and free radical scavenging activities of these pigments were also investigated. The adsorptive characteristics of five macroporous resins including HPD-600, HPD-500, D301-R, NKA-II and D296-R were studied and the results showed that the macroporous resin HPD-600 was most appropriate for extracting the pigments from molasses alcohol wastewater. The antioxidant and free radical scavenging activities of pigments extracted from alcohol wastewater were evaluated using nitrate, hydroxyl radical, superoxide anion radical and 1,1-diphenyl-2-picrylhydrazyl (DPPH) in vitro model systems. The pigment extract exhibited a concentration-dependent radical scavenging activity in all the systems. Meanwhile, scavenging activity of pigment extract in the DPPH system was found to be significantly (P < 0.05) higher than that in other systems and the 50% inhibitory concentration (IC₅₀ value) was about 0.07 mg/ml. The scavenging effect of pigment extract on superoxide anion radical was very weak with IC₅₀ value greater than 10 mg/ml.     

从酸枣皮中提取天然色素

研究了以生产酸枣汁的下脚料--酸枣皮为原料,通过提取、调pH、沉淀、分离、洗涤、干燥等简短的工艺流程,提取出成本低廉、安全性高、稳定性较好的天然棕色色素的方法;另外还对影响酸枣色素稳定性的有关因素进行了初步探讨。     

A new graft polymer pigment dispersant synthesis

Structured pigment dispersants are important in higher solids coatings because in these systems the vehicle components are not sufficiently high in molecular weight to disperse the pigment. Structured dispersants contain functional groups that are adsorbed on the pigment surface and arms of sufficient length that they provide entropic stabilization The synthesis of a family of dispersants by the simultaneous reaction of 2,3-epoxypropyl methacrylate (GMA) copolymers with monoacid functional polyester oligomers and the pigment active component, phthalimide, is described. In order to minimize the proportion of dispersant that has no entropic arms, which cause poor dispersion viscosity stability, the average dispersant molecule should contain at least 2.5 entropic arms. The synthesis and characterization of the GMA copolymer backbone, the polyester entropic arm and the hydroxypolyester binder reactive arm is discussed. The product distribution in the synthesis of the hydroxypolyester arm from caprolactone and 2,2′-bis(hydroxymethyl) propionic acid (DMPA) is dependent on reaction time and temperature. NMR studies show that over half of the product is substituted on only one of the DMPA hydroxyls. The DMPA concentration increases at times and temperatures higher than those required to just complete caprolactone conversion because of equilibration of the kinetic product.     

有机颜料中间体N,N′—双乙酰乙酰基2—甲基—5—氯代—1,4—苯二胺的合成

以对氯甲苯为原料,经硝化,还原Ｎ－酰化,水解,乙酰乙酰化反应,制成有机颜料中间体Ｎ,Ｎ′－双乙酰乙酰基－２－甲基－５－氯代－１,４－苯二胺。对影响反应的诸因素进行了讨论。     

颜料对太阳热反射涂层热反射性能的影响

在对太阳热反射涂层反射原理分析的基础上,研究了颜料粒子的形状、颜料作积分数以及颜料的聚集状态对太阳热反射率的影响。     

ABS树脂着色技术进展

介绍了ABS树脂着色用色母料的颜料和染料、载体树脂、分散剂的品种和发展趋势,叙述了色母料的生产方法。     

粒度对高温色料色度的影响

运用离子呈色理论、晶体场理论,较好地解释了颜色釉的呈色机理,并根据色料的晶体结构及在釉中的存在状态,借助粒度分析仪、色度仪研究了色料的粒度大小对色度的影响规律.     

杨柳纺涂料印花工艺

针对纯棉起绉产品在退浆,煮练,定形,印花等各加工环节中易出现的生产问题,提出了具体的解决办法及工艺处方等。经生产实践证明,该工艺合理,生产的产品各项指标的达到出口要求。     

桔黄色素微波萃取的研究

研究了影响微波萃取桔黄色素的各项因素及萃取的桔黄色素品质。试验表明 :桔皮含水量为 35 % ,颗粒大小为 6 0目 ,4 0倍桔皮的乙醇为溶剂 ,10min的微波萃取作用下所得桔皮色素不仅收率最高 ,而且性能稳定 ,质量较好。     

海南黑糯玉米色素的提取及其稳定性的研究

本文对海南玉米新品种黑糯玉米色素的提取及其稳定性进行了研究，详细讨论了酸度、温度、光照、氧化还原剂、金属离子及常用食品添加剂对色素稳定性的影响。