养殖用天然细胞活化剂──“Fullvon─103”

养殖用天然细胞活化剂──“Ｆｕｌｌｖｏｎ─１０３”王少卿池塘养鱼由于使用化学药物及过量的抗生物质，出现耐药菌，使生态系统失调，鱼类不能存活，结果不得不重新挖塘另辟新池。但如此方法也只能维持两三年，以后又需再选择未经污染之地，以供养殖。为什么新的土地在...

酰化肽的合成研究

以味精厂发酵废水中提取的菌体经水解所得水解蛋白、油酸、三氯化磷、氢氧化钠为原料,在碱性条件下,恒温50℃,滴加油酰氯反应3-4h,合成了天然表面活性剂酰化肽,并测出其相对分子质量。

Experimental Study of Natural Gas Storage in Hydrates

Hydrate formation rate plays an important role in the making of hydrates for natural gas storage. The effect of sodium dodecyl sulfate (SDS), alkyl polysaccharide glycoside (APG) and cyclopentane (CP) on natural gas hydrate formation rate, induction time and storage capacity was studied. Micellar surfactant solutions were found to increase hydrate formation rate in a quiescent system and improve hydrate formation rate and natural gas storage capacity. The process of hydrate formation includes two stages with surfactant presence. Hydrate forms quickly in the first stage, and then the formation rate is slowed down. Surfactants (SDS or APG) reduce the induction time of hydrate formation. The effect of an anionic surfactant (SDS) on gas storage in hydrates is more pronounced compared to a nonionic surfactant (APG). CP also reduces the induction time of hydrate formation, but can not improve the natural gas storage capacity in hydrates.

Surface Performance Testing of Cardanol Polyoxyethylene Ether and Its Application in Detergent

Cardanol polyoxyethylene ether is a kind of nonionic surfactants based on natural raw materials, with good surface activity and resistance to hard water. At 25 ℃, the value of critical micelle concentration （CMC） is 6.09×10-6 mol/L, and the lowest surface tension （TcMc） is 38.08 mN/m. Moreover, cardanol polyoxyethylene ether has strong salt tolerance to monovalent inorganic salts; with the increase of concentration of divalent inorganic salt, the surface activity of cardanol polyoxyethylene ether is enhanced. The effect of monohydric alcohol on the surface activity of cardanol polyoxyethylene ether is complex： the ability of BGF-10 to form micelles increases and then decreases with the increase of the concentration of monohydric alcohol, cardanol polyoxyethylene ether has a synergistic effect with anionic, nonionic and cationic surfactants, especially with hexadecyltrimethylammonium bromide （CTAB）, and its critical micelle concentration is decreased by 2.52%, while the surface tension is decreased by 11.49%. Test results also show, comparing to nonylphenol polyoxyethylene ether, the emulsifying and the thickening performances of cardanol polyoxyethylene ether are better, and its foam performance is lower. Also, the cloud point of cardanol polyoxyethylene ether is higher than nonylphenol polyoxyethylene ether. In most case, the detergency of cardanol polyoxyethylene ether is better than or equivalent to nonylphenol polyoxyethylene ether. cardanol polyoxyethylene ether is an excellent alternative to nonylphenol polyoxyethylene ether in detergents.

Investigation of Natural Essential Oil Antioxidant Activity on Peroxidase Enzyme in Selected Vegetables

The aim of this work was to study the effect of essential oils as natural antioxidant for inhibition of peroxidase enzyme activity. Peroxidase enzyme is one of the most important enzymes in plant tissue which can bind to hydrogen peroxide and produce an activated complex that can react with a wide range of donor molecules. Therefore inactivation of the enzyme may increase the shelf life of raw and un-blanched frozen vegetables. In order to inactivate of the enzyme several physical and chemical treatments among them heating （blanching）, lowering pH or aw or adding chemical additives can be used, however each of the above mentioned methods has a kind of shortcoming. Our results indicated that crude extract of red cabbage and cabbage has the highest and potato and lettuce has the lowest peroxidase activity respectively （P〈0.05）. Although peroxidase resistance to essential oils varied among different vegetables but clove in all concentration had the best effects in decrease ofperoxidase activity （P〈0.05） whereas cumin and fennel were partially able to reduce the enzyme activity. （P〈0.05）.

Acid mine drainage activation mechanism on lime-depressed pyrite flotation from copper sulfide ore

The lime-depressed pyrite from Cu differential flotation tailings with acid mine drainage(AMD)as a natural activator was recovered.The effect of AMD on lime-depressed pyrite flotation was investigated by a series of laboratory flotation tests and surface analytical techniques.Flotation test results indicated that AMD could effectively activate the pyrite flotation with a sodium butyl xanthate(SBX)collector,and a high-quality sulfur concentrate was obtained.Pulp ion concentration analysis results indicated that AMD facilitated desorption of Ca~(2+)and adsorption of Cu~(2+)on the depressed-pyrite surface.Adsorption measurements and contact angle analysis results confirmed that adding AMD improved the adsorption amount of SBX collector on the pyrite surface and increased the contact angle by 31°.Results of Raman spectroscopy and X-ray photoelectron spectroscopy analysis indicated that AMD treatment promoted the formation of hydrophobic species(S~0 hydrophobic entity and copper sulfides)and the removal of hydrophilic calcium and iron species on the pyrite surface,which reinforced the adsorption of collector.The findings of the present research provide important theoretical basis and technical support for a cleaner production of copper sulfide ores.