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萃取     
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  extraction
    A Study of the Extraction, Separation, Photo-oxidation and Bioassay of Azadirachtins
    印楝素的萃取、分离、改性及其生物活性研究
短句来源
    Application of Ultrasonic-and Microwave-assisted Extraction and Molecularly Imprinting Technique in the Separation and Analysis of Active Components from Traditional Chinese Medicines
    超声、微波助萃取及分子印迹技术在中草药活性成分分离分析中的研究与应用
短句来源
    Study on Composite Extraction Distillation Separation of Ethyl Acetate-Ethanol-Water Mixture
    复合萃取精馏分离乙酸乙酯—乙醇—水混合液的研究
短句来源
    EXTRACTION OF EPHEDRINE FROM EPHEDRA SINICA STAFF LEACH LIQUOR I.——Selection of Solvents and Determination of Distribution Data
    溶剂萃取法从麻黄草浸渍液提取麻黄素Ⅰ.——萃取溶剂的选择及分配数据的测定
短句来源
    A study of Extraction of Eu(Ⅱ), Sm(Ⅲ) and Gd(Ⅲ) by Mixed Fatty Acid
    混合脂肪酸萃取E_u(Ⅱ)S_m(Ⅲ)和G_d(Ⅲ)研究
短句来源
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  extracting
    Study on Supercritical Carbon Dioxide Extracting and Crystallizing Andrographolide
    穿心莲内酯超临界CO_2萃取结晶研究
短句来源
    STUDY ON NEW PROCESS OF EXTRACTING CHLOROPHYLL-CAROTENE PASTE FROM PINE NEEDLES AND TWIGS
    松针叶绿素-胡萝卜素软膏萃取新工艺研究
短句来源
    INFLUENCE OF EXTRACTING AND DRYING TREATMENT ON THE STRUCTURE OF UHMW—PE GEL FIBERS
    萃取干燥处理对UHMW-PE冻胶丝结构的影响
短句来源
    INFLUENCE OF EXTRACTING AND DRYING TREATMENT ON DRAWABILITY OF UHMW-PE GEL FIBER
    萃取干燥处理对UHMW-PE冻胶丝拉伸性能的影响
短句来源
    Extracting Glucoamylase by PEG/(NH4_)_2SO_4 Aqueous Bi-Phase System
    用PEG/(NH_4)_2SO_4双水相体系萃取糖化酶
短句来源
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  solvent extraction
    STUDY ON SOLVENT EXTRACTION PROCESSES FOR FURFURAL SEPARATION
    溶剂萃取法分离糠醛的研究
短句来源
    Separation of Tungsten and Silicon by Solvent Extraction
    溶剂萃取法分离钨与硅
短句来源
    Recovering of Malic Acid from Aqueous Solution by Solvent Extraction
    溶剂萃取法提取苹果酸
短句来源
    Recovery of Carboxylic Acids from Dilute Aqueous Solution by Solvent Extraction
    溶剂萃取法回收稀羧酸
短句来源
    PRELIMINARY STUDY OF SOLVENT EXTRACTION OF α-KETO-L-GULONIC ACID FROM FERMENTATION LIQUID
    溶媒萃取α-氧代-L-古龙酸的初步工艺研究
短句来源
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  extract
    Experimentation On Separation of Benzene Hydrogenization Mixures By Intermittence Extract Rectification
    间歇法萃取精馏分离苯部分加氢产物
短句来源
    Study on the Extraction of Cytochrome C from the Potk Heart Extract with Different Concentrations of AOT
    不同浓度AOT对猪心提取液中细胞色素C的萃取研究
短句来源
    The better intervals of experimental condition on rapid extraction of azadirachtin were found by the way of single factor and vary levels. The extract experiment was designed by orthogonal. The statistical method disposed the results of test.
    采用单因素多水平实验找到快速萃取法提取印楝素的较好实验条件区间,用正交法设计实验,对实验结果进行统计学处理,优选出快速萃取法提取印楝素的最佳工艺条件为印楝种子和萃取溶剂甲醇之间的物料比1∶1.0(W/V);
短句来源
    At the optimized conditions, the extraction yield of ISL was 0. 035% and the content of ISL in extract was 0. 84% , which were 3. 5 and 3. 0 times those of by Soxhlet extraction, respectively.
    实验结果表明,在优化的条件下,超临界CO2萃取异甘草素的提取率为0.035%,异甘草素在提取物中的质量分数为0.84%,分别是索氏提取法提取率的3.5倍,质量分数的3.0倍。
短句来源
    The microwave-assisted extraction technology was used to extract Astragalus polysaccharides (APS) from the dried roots of Astragalus membranaceus Bunge var.mongholicus (Bunge) Hsiao.
    用微波萃取技术从内蒙古黄芪[Astragalus membranaceus(Fisch.) Bunge var.mongholious(Bunge)Hsiao]的干燥根中提取黄芪多糖。
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  extraction
The water-soluble glucan was obtained from Pleurotus florida fruit bodies by hot water extraction, ethanol precipitation, DEAE cellulose dialysis and Sephadex G-75 gel filtration.
      
The acid treatment of LiAlTiO4 caused Li+ extraction ratio to change from 28% to 72%, while the dissolution of Al is less than 6.8%.
      
Sample pretreatment microfluidic chip for DNA extraction from rat peripheral blood
      
A sample pretreatment microfluidic chip was described based on the principle of solid phase extraction and micro electro mechanical system technology.
      
A new feature extraction method using the amplitude fluctuation property of target HRRP for radar automatic target recognition
      
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  extracting
This paper provides a novel way for extracting the new sorting feature of radar signals.
      
A novel scheme for extracting the global scattering center model of radar targets is proposed in this paper.
      
We then present the arithmetic for dynamic automatic identification of standing tree limbs, extracting basic growth characteristics of the standing trees such as the form, size, degree of bending and their relative spatial position.
      
Wavelet design for extracting weak fault feature based on lifting scheme
      
Simulation and engineering results confirm that the proposed method is better than other wavelet methods for extracting weak fault feature.
      
更多          
  solvent extraction
Solvent extraction-atomic absorption determination of chromium(VI) in soils
      
Other techniques for solving the above problem, namely, an increase in the temperature of the test solution temperature or the use of solvent extraction, bioaccumulation, and unusual analytical procedures are also considered.
      
A procedure was developed for determining germanium as a Rhodamine 6G-8-molybdogermanic heteropoly acid ion-pair complex in solutions obtained after germanium separation by solvent extraction from the matrix of various Ge-containing samples.
      
The procedure accuracy was evaluated by determining germanium in a reference standard sample of steel after preliminary separation by solvent extraction.
      
Solvent extraction with dithiophosphoric acids was proposed for the separation of selenium from the interferents.
      
更多          
  extract
Activity was not recorded for hexane extract, against A.
      
aureus in lower concentration of chloroform extract.
      
Methanol extract showed more activity amongst all the solvent extracts, particularly remarkable activity recorded against gram-positive bacteria.
      
An immunoenhancing polysaccharide isolated from the hot aqueous extract of mature pods of Moringa oleifera was found to contain only D-glucose as a monosaccharide constituent.
      
STRUCTURAL CHARACTERISATION OF AN IMMUNOMODULATING POLYSACCHARIDE ISOLATED FROM AQUEOUS EXTRACT OF PLEUROTUS FLORIDA FRUIT-BODIE
      
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  其他


The extractability of Rhodamine B—Au complex from hydrochloric acid containing ammonium chloride with seven organic solvents was examined and if was found that the mixture of benzene and ethyl ether(3:2) is the best extractant, with maximum extinction at 580mμ. We substituted sodium chloride and potassium chloride for ammonium chloride and found that patassium chloride is the most suitable. The system obeys Beer's law at a gold concentration of 0.1 to 1.8μg per ml, giving a sensitivity of 0.003μg of gold per...

The extractability of Rhodamine B—Au complex from hydrochloric acid containing ammonium chloride with seven organic solvents was examined and if was found that the mixture of benzene and ethyl ether(3:2) is the best extractant, with maximum extinction at 580mμ. We substituted sodium chloride and potassium chloride for ammonium chloride and found that patassium chloride is the most suitable. The system obeys Beer's law at a gold concentration of 0.1 to 1.8μg per ml, giving a sensitivity of 0.003μg of gold per cm~2 (sandell). In this method, only antimony, tin and iron caused serious interference. By applying Job's method of continuous variation, molar method of Yoe and slope ratio method, it was found that the complex contains the reactants in 1:1 ratio. The dissociation constant of the complex was found to be 9.65×10~(-5).

在本文中試驗了七种有机溶剂萃取罗丹明B-金络合物,发現用苯与乙醚(3:2)的混合液萃取最为适宜,在580mμ光密度值最大。我們采用氯化鈉与氧化鉀代替氯化銨,发現氫化鉀最适宜。本方法在0.1~1.8μg Au/ml范围内服从比耳定律,灵敏度为0.003μg Au/cm~2(SandeH表示法)。本法較单独用苯萃取灵敏。本法中,只有锑、錫、鉄引起严重干扰。由Job’s連續改变法,克分子比法与斜率比法测得的結果可知金与罗丹明B以1:1相結合。应用不等克分子法测定有色絡合物在苯与乙醚混合液中的离解常数,其值为9.65×10~(-5)。

The cross-linked polymers formed by heat-curing of seven anhydrides and their eutectic mixtures with bisphenol A epoxy resin can be hydrolyzed in benzene-alcoholic sodium hydroxide solution. On acidifying and extracting the precipitates (sodium salt of dibasic acids) which are insoluble in organic solution, their corresponding dibasic acids can be obtained. Single dibasic acid can be identified by infrared spectroscopy while mixed dibasic acids have to be differentiated by paper chromatography in isopro-panol-ammonia...

The cross-linked polymers formed by heat-curing of seven anhydrides and their eutectic mixtures with bisphenol A epoxy resin can be hydrolyzed in benzene-alcoholic sodium hydroxide solution. On acidifying and extracting the precipitates (sodium salt of dibasic acids) which are insoluble in organic solution, their corresponding dibasic acids can be obtained. Single dibasic acid can be identified by infrared spectroscopy while mixed dibasic acids have to be differentiated by paper chromatography in isopro-panol-ammonia system. The epoxy resin cured with maleic anhydride yields fumaric acid and small amount of maleic acid upon hydrolysis and separation. The content of fumaric acid increases with elevation of curing temperature and thus proves that the occurence of this cis-trans isomerization should rather be attributed to the influence of heat during the course of cure than to the action of chemicals upon hydrolysis and acidification.

七种酸酐或它们的低共熔混合物与双酚A环氧树脂加热固化成交联聚合物后,可用氢氧化钠的苯-乙醇混合溶液来水解,不溶解于有机溶液中的沉淀物(二元酸的钠盐)经酸化与乙醚萃取可得到相应的二元酸。单一的二元酸可用红外光谱法鉴定,而混合二元酸则必须在异丙醇-氨水展开剂中用纸层析来鉴别。用顺丁烯二酸酐固化的环氧树脂经水解与分离后得到的主要是反丁烯二酸和少量顺丁烯二酸,前者的含量随固化温度的提高而增多,因而确证这一顺-反异构化反应是在固化过程中受热,而不是在水解,酸化时受化学试剂的作用产生的。

An analytical procedure for the determination of strontium-90 in environmental samples by extraction with di-2-ethylhexylphosphorio acid (HDEHP) is described. Strontium-90 is estimated by solvent extraction of the daughter product yttrium-90 in the system HNO_3-HDEHP-toluene. The procedure is convenient, fast and accurate. ~(85)Sr tracing results show that for biological material strontium recoveries are 95 % and for fallout material~90%. In the presence of naturally radioactive isotopes and fission products,...

An analytical procedure for the determination of strontium-90 in environmental samples by extraction with di-2-ethylhexylphosphorio acid (HDEHP) is described. Strontium-90 is estimated by solvent extraction of the daughter product yttrium-90 in the system HNO_3-HDEHP-toluene. The procedure is convenient, fast and accurate. ~(85)Sr tracing results show that for biological material strontium recoveries are 95 % and for fallout material~90%. In the presence of naturally radioactive isotopes and fission products, the procedure is also applicable. For ~(140)Ba-~(140)La, fission products from which strontium and barium have been removed and for ~(212)Pb-~(212)Bi belonging to the thorium series, the decontamination factors have attained 10~4. Analytical results of the samples are perfectly satisfactory. The significance test showed that this method is comparable to the fuming nitric acid method.Furthermore, the application is described of HDEHP and a quaternary amine, N_(263), to achieve rapid determination of strontium-90 via direot extraction of yttrium-90. A rapid method is given, and when biologioal samples are analysed, the results can be reported in two hours.

本文叙述用二-(2-乙基已基)磷酸(HDEHP)萃取测定环境样品中锶-90的各种条件的研究,并在最佳条件下提出分析程序。锶90的含量通过HNO_3 -HDEHP-甲苯体系中溶剂萃取子体产物钇-90而获得。程序简便、快速而准确。~(85)Sr示踪的结果表明,锶回收对于生物样品是95%,对于沉降物~90%。程序在有天然放射性同位素和裂变产物存在下也是可用的。对于~(140)Ba-~(140)La,去锶、钡裂变产物,钍系的~(212)Pb-~(212)Bi,去污系数达到了10~4。样品分析的结果十分满意。显著性检验证明本方法的结果与发烟硝酸法的结果一致。本文还进一步讨论应用二-(2-乙基己基)磷酸和季胺N_(266)实现直接萃取~(90)Y而快速测定~(90)Sr的问题,提供的快速测定方法,分析生物样品时,能在二小时之内报告结果。

 
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