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  打*嚏的素面 2009-05-10 00:00:00

  取样点板:Sampling point board 所有内容: The question: I would like to ask "in the GF254 silica gel plate， sampling points， boards， visible under ultraviolet light at 254 nm observed" how to translate this sentence? Focus do not know "sampling points" and how the translation Second problem: the trouble of translation experts to help you 2 Results 2.1 Separation of the results of column chromatography The results of separation by column chromatography Column chromatographic separation process， chloroform: methanol 95:5 and 90:10 pm elution flow out through repeated silica gel column chromatography of the purified components C3. 2.2 Thin Layer Chromatography test results The results of Thin-layer chromatography. C3 components on the board in the silica gel GF254 was launched， 254nm UV lamp can be directly observed as a single point， shown in figure 1. 2.3 Preparation of high-performance liquid chromatography analysis and single compounds Determination of the component C3 to the preparation， chromatogram showed four peaks (see Figure 2)， better separation， the collection of four-component single-peak， the four compounds 1 ~ 4， for more than 4 HPLC analysis of compounds are single-peak， see Figure 3 ~ 4. 3 Identification of compounds Preparation of liquid collected through the four compounds， three of them for structural identification of compounds: Compounds 1， yellow crystals， UV λmax nm (logε): 248 nm. E IMS， m / z 501. 3 [M + 1] +， molecular weight of 500. 1 H spectrum of compound 7 showed methyl signals; δ1. 02， 0. 93， 0. 78 (each 3H， s)， 0. 89 (3H， d， J = 6. 4Hz)， 1. 23， 1. 25 (each 3H， d， J = 5. 2Hz)， 1. 22 (3H， s)， a company's hydrogen-oxygen and carbon signals δ3. 23 (1H， dd， J = 10 Hz)， in line with the triterpenoid compounds structure， can prove of Adduct 1 triterpenes. Compounds 2， UV λmax nm (logε): 250 nm. E IMS， m / z 515. 3 [M + 1] +， a molecular weight of 514. NMR of compound 2 showed seven methyl signals δ0. 77， 0. 94， 1.01， 1. 22， 1. 23 (3H， s)， 0. 82 (3H， d， 10. 2 Hz)， a company oxygen and carbon on the hydrogen signal δ3. 22 (1H， dd， J = 10. 5Hz)， a hydrogen on the methoxy signal δ3. 66 (3H， s)， in line with the structure of triterpenoids， compounds 2 to prove triterpenoids. Compounds 3， UV λmax nm (logε): 254 nm. EIMS， m / z 531. 2 [M + 1] +， a molecular weight of 514. NMR of compound 2 (see appendix) shows that 7-methyl signal δ0.78， 0. 82， 0. 87， 1. 03， 1. 24， 1. 31 (3H， s)， 1. 17 (3H， d， 6. 6 Hz)， a hydrogen-acetyl signal at 2. 10 (3H， s)， a methoxy-group signal of hydrogen 3. 68 (3H， s)， in line with the structure of triterpenoid compounds， can prove compounds 3 triterpenoids. 4 the structure of more complex compounds can not be identified as triterpenoids.

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  范哲宇sunshine 2009-05-09 00:00:00

  The question: I would like to ask "in the GF254 silica gel plate， sampling points， boards， visible under ultraviolet light at 254 nm observed" how to translate this sentence? Focus do not know "sampling points" and how the translation Second problem: the trouble of translation experts to help you 2 Results 2.1 Separation of the results of column chromatography The results of separation by column chromatography Column chromatographic separation process， chloroform: methanol 95:5 and 90:10 pm elution flow out through repeated silica gel column chromatography of the purified components C3. 2.2 Thin Layer Chromatography test results The results of Thin-layer chromatography. C3 components on the board in the silica gel GF254 was launched， 254nm UV lamp can be directly observed as a single point， shown in figure 1. 2.3 Preparation of high-performance liquid chromatography analysis and single compounds Determination of the component C3 to the preparation， chromatogram showed four peaks (see Figure 2)， better separation， the collection of four-component single-peak， the four compounds 1 ~ 4， for more than 4 HPLC analysis of compounds are single-peak， see Figure 3 ~ 4. 3 Identification of compounds Preparation of liquid collected through the four compounds， three of them for structural identification of compounds: Compounds 1， yellow crystals， UV λmax nm (logε): 248 nm. E IMS， m / z 501. 3 [M + 1] +， molecular weight of 500. 1 H spectrum of compound 7 showed methyl signals; δ1. 02， 0. 93， 0. 78 (each 3H， s)， 0. 89 (3H， d， J = 6. 4Hz)， 1. 23， 1. 25 (each 3H， d， J = 5. 2Hz)， 1. 22 (3H， s)， a company's hydrogen-oxygen and carbon signals δ3. 23 (1H， dd， J = 10 Hz)， in line with the triterpenoid compounds structure， can prove of Adduct 1 triterpenes. Compounds 2， UV λmax nm (logε): 250 nm. E IMS， m / z 515. 3 [M + 1] +， a molecular weight of 514. NMR of compound 2 showed seven methyl signals δ0. 77， 0. 94， 1.01， 1. 22， 1. 23 (3H， s)， 0. 82 (3H， d， 10. 2 Hz)， a company oxygen and carbon on the hydrogen signal δ3. 22 (1H， dd， J = 10. 5Hz)， a hydrogen on the methoxy signal δ3. 66 (3H， s)， in line with the structure of triterpenoids， compounds 2 to prove triterpenoids. Compounds 3， UV λmax nm (logε): 254 nm. EIMS， m / z 531. 2 [M + 1] +， a molecular weight of 514. NMR of compound 2 (see appendix) shows that 7-methyl signal δ0.78， 0. 82， 0. 87， 1. 03， 1. 24， 1. 31 (3H， s)， 1. 17 (3H， d， 6. 6 Hz)， a hydrogen-acetyl signal at 2. 10 (3H， s)， a methoxy-group signal of hydrogen 3. 68 (3H， s)， in line with the structure of triterpenoid compounds， can prove compounds 3 triterpenoids. 4 the structure of more complex compounds can not be identified as triterpenoids. (我把你写的全翻了)

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  西子湖与颐和园 2009-05-08 00:00:00

  GF254 silica gel plate in the sampling points， boards， visible under ultraviolet light at 254 nm observations

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  wangbiaocooec 2009-05-13 00:00:00

  发英文文章难啊，Z好是从相关文献中找差不多的句子套用，要不审稿人一看你就知道是外行，一般的翻译软件这方面没什么用，本人爱莫能助！

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