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basis of chemical methods
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  “basis of chemical methods”译为未确定词的双语例句
     Methods The compounds were separated by means of solvent extraction, chromatography on absorbent resin SP825 and silica gel C_ 18 repeatedly, and their structures were elucidated on the basis of chemical methods and spectral analyses (FAB-MS,~ 1H NMR,~ 13 C NMR,~ 1H-~1H COSY).
     方法采用水煎提取、大孔吸附树脂SP825柱色谱、反相C18柱色谱等进行分离,并通过化学手段和光谱分析(FAB-MS,1HNMR,13CNMR,1H-1HCOSY)鉴定其化学结构。
短句来源
     Six saponins were isolated from the fruit pedicels of Panax notoginseng. Five of them were identified as gypenoside-ⅩⅦ,-ⅩⅤ, ginsenoside-Rb_1, and notoginsenoside-Fc, -Fa on the basis of chemical methods, spectroscopic analysis and comparison with authentic standards.
     继前报后又从三七果梗中分离出6种皂甙,经化学方法、光谱分析及与标准品对照鉴定其中5种为绞股蓝皂甙-ⅩⅦ,-ⅩⅤ,人参皂甙-Rb_1,三七皂甙-Fc,-Fa。
短句来源
     collected in Sichuan Province,China,a new triterpenes,alisol F 24 acetate,was isolated. On the basis of chemical methods and spectroscopic analysis its structure was elucidated as 16β,23β epoxy 11β,25 dihydroxy 24(R) acetoxy protost 13(17) en 3 one. alisol F,alisol B 23 acetate,16β Hydroxyalisol B23 acetate,13β,17β Epoxyalisol B,alisol C 23 acetate,alisol C were also isolated from this plant.
     从四川产泽泻中分离出七个泽泻醇类成分 ,其中 2 4 乙酰泽泻醇F为新确定的立体构型 ,其它已知成分为泽泻醇F、2 3 乙酰泽泻醇B、16 羟基 2 3 乙酰泽泻醇B、13β ,17β 环氧泽泻醇B、2 3 乙酰泽泻醇C、泽泻醇C
短句来源
     Results On the basis of chemical methods and spectral evidences,especially 2D NMR and ESI-MS technologies,these two compounds were identified as 3-O-(3-O-methyl-β-D-glucopyranosyl(1→3)-β-D-quinovopyranosyl(1→4)-β-D-quinovopyranosyl(1→2)-β-D-xylopyranosyl)-holosta-9-ene-3β,12α,17α,25β-tetraol(Ⅰ),named as nobiliside 1a;
     结果应用现代光谱技术(尤其是2D-NM R和ES I-M S技术)和化学方法鉴定其结构:3-O-〔3-O-甲基-β-D-吡喃葡萄糖(1→3)-β-D-吡喃奎诺糖(1→4)-β-D-吡喃奎诺糖(1→2)-β-D-吡喃木糖〕-海参烷-9-烯-3,β12,α17,α25β-四醇(Ⅰ),命名为黑乳海参皂苷1a;
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  相似匹配句对
     The structure of isidiophorin was elucidated on the basis of spectra and chemical methods.
     其中针肺晶为一新的缩酚酮,根据光谱和化学分析,推定了其结构。
短句来源
     [Methods]
     【实验方法】
短句来源
     Methods
     对象与方法
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     Theory Basis and Methods of S & T Plan
     科技发展规划的理论与方法初探
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     On the basis of W.
     在W.
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Six saponins were isolated from the fruit pedicels of Panax notoginseng. Five of them were identified as gypenoside-ⅩⅦ,-ⅩⅤ, ginsenoside-Rb_1, and notoginsenoside-Fc, -Fa on the basis of chemical methods, spectroscopic analysis and comparison with authentic standards. Quantitative determination of the major saponins in fruit pedicels from the plant was made by thin layer chromatography-densitometry.

继前报后又从三七果梗中分离出6种皂甙,经化学方法、光谱分析及与标准品对照鉴定其中5种为绞股蓝皂甙-ⅩⅦ,-ⅩⅤ,人参皂甙-Rb_1,三七皂甙-Fc,-Fa。并测定了三七果梗中主要皂甙的相对含量。

Abstract Ten compounds were isolated from the ethanolic extract of the roots of Rhodiola crenulata which was collected from Lijian, Yunnan. On the basis of chemical methods and analysis of spectra data, their structures were indentified as: kaempferol (1), kaempferol 7-O-α-L-rhamnopyranoside (2), crenuloside (3), herbacetin 7-O-α-L-rhamnopyranoside (4), herbacetin 7-O-(3"-O-β-D-glucopyranosyl)-α-L-rhamnopyranoside (5), crenulatin (6), ellagic acid (7), salidroside (8), gallic acid (9), gallic acid ethyl...

Abstract Ten compounds were isolated from the ethanolic extract of the roots of Rhodiola crenulata which was collected from Lijian, Yunnan. On the basis of chemical methods and analysis of spectra data, their structures were indentified as: kaempferol (1), kaempferol 7-O-α-L-rhamnopyranoside (2), crenuloside (3), herbacetin 7-O-α-L-rhamnopyranoside (4), herbacetin 7-O-(3"-O-β-D-glucopyranosyl)-α-L-rhamnopyranoside (5), crenulatin (6), ellagic acid (7), salidroside (8), gallic acid (9), gallic acid ethyl ester (10), among them, 1,2,3,6,7 were isolated from this species for the first time. 3 is a new kaempferol glycoside, 6 is a flavonol derivative which has a rare structure, it was elucidated on the basis of 13C NMR, 1H-1H COSY, 1H-13C COSY spectrum for the first time.

从云南丽江产民间药物大花红景天(Rhodiola crenulata)根的乙醇提取物中分离得到10个化合物,经化学方法和光谱数据分析,10个化合物结构鉴定为:山奈酚(1),山东酚7-O-α-L-鼠李糖苷(2),大花红景天苷(3),草质素7-O-α-L-鼠李糖苷(4),草质素7-O-(3”-O-β-D-葡萄糖基)-α-L-鼠李糖苷(5),大花红景天素(6),鞣花酸(7),红景天苷(8),没食子酸(9),没食子酸乙酯(10).其中化合物l,2,3,6,7是首次从大花红景天中得到,化合物3为一新的山奈酚苷,用(13)~NMR,1~H-1~H COSY,(13)~C-1~H COSY谱确证6为一种结构罕见的黄酮醇与苯丙素结合而成的化合物.

Two new ellagic glycosides,named ducheside A and ducheside B,have beenisolated from Ducheside indica Focke.Their structures were established as 3'-O-methyl-ellagic acid-4-O-β-D-xylopyranoside(Ⅰ),3'-O-methyl-ellagic acid-4-O-α-L-arabinofuranoside(Ⅱ),respec-tively,on the basis of chemical method and spectral analysis.In addition,four known compoundswere isolated and identified as 3β-hydroxylurs-12-en-28-oic acid(Ⅲ),2α,3β,19α-trihydroxylurs-12-en-28-oic acid(Ⅳ),2α,3β,19α-trihydroxylurs-12-en-28-oic...

Two new ellagic glycosides,named ducheside A and ducheside B,have beenisolated from Ducheside indica Focke.Their structures were established as 3'-O-methyl-ellagic acid-4-O-β-D-xylopyranoside(Ⅰ),3'-O-methyl-ellagic acid-4-O-α-L-arabinofuranoside(Ⅱ),respec-tively,on the basis of chemical method and spectral analysis.In addition,four known compoundswere isolated and identified as 3β-hydroxylurs-12-en-28-oic acid(Ⅲ),2α,3β,19α-trihydroxylurs-12-en-28-oic acid(Ⅳ),2α,3β,19α-trihydroxylurs-12-en-28-oic acid-28-O-β-D-glucopyranoside(Ⅴ),2α,3α,19α-trihydroxylurs-12-en-28-oic acid-28-O-β-D-glucopyranoside(Ⅵ).CompoundsⅣ,Ⅴ,Ⅵ were isolated for the first time from Duchesnea genus.

自蛇毒(DuchesneaindicaFock)全草中分离出6个化合物,其中,2个为新化合物,分别命名为蛇莓甙A(duchesideA)和蛇莓甙B(duchesideB),经化学及光谱(UV,1R,1HNMR,13CNMR,NOEDS和MS)分析确定,蛇莓甙A的结构为3'-O-甲基-鞣花酸-4-O-β-D-吡喃木糖甙(Ⅰ),蛇莓甙B的结构为3'-O-甲基-鞣花酸-4-O-α-L-呋喃阿拉伯糖甙(Ⅱ)。另外4个化合物为已知三萜类化合物:3β-羟基-乌苏烷-12-烯-28-羧酸(Ⅲ),2α,3β,19α-三羟基-乌苏烷-12-烯-28-羧酸(Ⅳ),2α,3β,19α-三羟基-乌苏烷-12-烯-28-羧酸-28-O-β-D-吡喃葡萄糖甙(Ⅴ),2α,3α,19α-三羟基-乌苏烷-12-烯-28-羧酸-28-O-β-D-吡喃葡萄糖甙(Ⅵ)。其中化合物Ⅳ,Ⅴ和Ⅵ为首次从该属植物中分离得到。

 
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