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- The product xylose is identified by silica gel TLC, optical activity measurement and other approval tests. 成品经过薄层层析和旋光测定等鉴定确定为木糖。
- silica gel TLC 硅胶薄层色谱法
- The acetates of sterols were further separated by TLC with silver nitrate impregnated silica gel G and HPLC. 甾醇部分经乙酰化后,由气相色谱法分析,并采用硝酸银硅胶制备薄层色谱法和高效液相色谱法进一步分离。
- The pure squalene(99.9%) was separated from liver oil of Mustelus griseus(Pietschmann) by TLC on silver nitrate-impregnated silica gel. 应用硝酸银-硅胶薄层色谱的分离技术从灰星鲨肝油的烃类部分分离得到角鲨烯纯样品(99。
- The crude oil is chromatographed over silica gel. 粗制油状物用硅胶进行色谱分离。
- The optimal conditions of TLC were as follows: silica gel G as stationary phase, n-hexane-dichloromethane (9:1, v/v) as mobile phase. 薄层分析以薄层层析硅胶G为固定相,正己烷:二氯甲烷(9:1,v/v)为展开剂。
- The optimal conditions of TLC were as follows:silica gel GF254 as stationary phase, n-hexane-ethyl acetate (5:1, v/v) as mobilephase. The Rf value of hyperforin was 0.41. 薄层色谱的最佳条件为:以薄层层析硅胶 GF254 为固定相;以正己烷-乙酸乙酯 (5:1;v/v)为展开剂;贯叶金丝桃素的 Rf值为 0.;41。
- Methods Artemisinin is extracted with petroleum ether and pass column of silica gel and gradient elution with ethyl acetate,then it is tracked with TLC and detected with UV-VIS. 方法青蒿经石油醚提取浓缩,浸膏经过硅胶柱,用不同配比的乙酸乙酯洗脱,用TLC法跟踪,UV法检测。
- Methods: The compounds wereisolated and purified by macroporous adsorption resin, silica gel column chromatography and preparative TLC chro-matography and their structures were identified on the basis of their physicochemical and spectral data. 方法:利用大孔吸附树脂、硅胶柱层析、制备薄层色谱法进行分离纯化,根据化合物的理化性质和光谱数据鉴定结构。
- The purity of isoquercitrin was isolated with a silica gel column. 酶反应产物用硅胶柱层析法提取,可以得到高纯度的异槲皮甙。
- The handpiece cable is made from silica gel tube,soft and durable. 换能器尾线采用进口材料硅胶管,柔软耐用。
- Methods: To isolate compounds from EtOAc extracts of Daphne Genkwa by Thin Layer Chromatography(TLC) and silica gel and Toyopearl HW-40 column chromatography and to identify the compounds by chemical and spectral methods. 方法:将芫花叶乙酸乙酯萃取物利用硅胶柱和Toyopearl HW-40(C)柱层析法分离黄酮类化学成分,利用化学反应及HNMR谱鉴定其结构。
- The unsaponifiables from mentioned corn oil rich in selenium were separated by designed TLC of silica gel G into 7 fractions. The sterol,4-methylsterol and triterpene alcohol were analyzed quantitatively by GC. 用制备薄层层析法将富硒玉米油的不皂化物分成 7个部分 ,然后用气相色谱法分别测定甾醇、4 -甲基甾醇和三萜醇的组成。
- Twenty-one compounds were obtained from the chloroform and ethyl acetate extraction through repeated silica gel colum chromatograph, preparative TLC, recrystalization and 19 compounds were identified by means of UV IR MS DEPT ~1HNMR ~13CNMR etc. 从四楞蒿氯仿部位、乙酸乙酯部位通过柱色谱、制备薄板、重结晶等方法分离得到了21个化合物,通过UV、IR、MS、DEPT、~1HNMR、~(13)CNMR等方法鉴定出其中的19个化合物,主要是黄酮类化合物,三萜类。
- All seals of this machine use the thermostable silica gel (food grade). 该机所有密封件均采用耐高温硅胶件(食品级)。
- There is no possibility to form silica gel in the hard-ened waterglass. 硬化的水玻璃实际上是失水的高模数水玻璃,不可能有硅凝胶生成。
- The specimen was extracted by the macroreticular resin and silica gel column. 样品经大孔树脂柱、硅胶柱分离,然后用TLC进行鉴定合并。
- You may reactivate the silica gel by desorbing the water through heating. 硅胶吸附水份后可通过脱附方式除掉水份而再生。
- The alternative use of buffered silica gel resulted in modest hydrolysis (~5-10%) of the imine. 选用温和的水解导致缓冲硅胶(~5-10%25)的亚胺.
- METHODS: Alcoholic extraction, silica gel, ODS column chromatography and recrystallization were used. 方法:采用工业酒精提取、胶柱层析、DS柱层析和重结晶等方法。