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雨雪寒天銀蟲 (小有名氣)
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[求助]
求高手幫忙翻譯關(guān)于多糖的CA文獻(xiàn)摘要
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The antitumor β-D-glucan[I,(1→3)-linked with a D-glucosyl group attached to position 6 of alternate units] produced by S.sclerotiorum IFO 935 afforded a gel in neutral aq.soln.which gave no 13C-NMR signals. Signals appeared on the addu to the gel of NaoH to 0.5M and the linewidth was narrowest near 0.25M base(get-to-sol transition).I bound to Congo Red and shifted the λmax in a manner similar to that of curdlan. Neutralization of the sol regenerated the magic-angle-spinning) 13C-NMR spectra,esp the signals for C-3 which appeared at 86 and 89 ppm resp. The c.p-m.a.s spectrum of regenerated І was similar to that of curdlan,suggesting a helical structure.Thus,I and regenerated I appear to have different conformations. |

至尊木蟲 (職業(yè)作家)
| 抗癌葡聚糖在存在硅膠的中性水溶液中制備。這種葡聚糖沒(méi)有C譜信號(hào)。當(dāng)向硅膠中加入0.5mol/l的NAOH和0.25mol/l的堿時(shí)會(huì)出現(xiàn)C信號(hào)。添加剛果紅,以熱凝膠的方式調(diào)整 λmax的值。 中性水溶液中C13信號(hào)出現(xiàn)在86至89ppm處。 譜圖的再生與熱凝膠相似,可能是一種螺旋的結(jié)構(gòu)。因些再生與原來(lái)相比還是不一樣的構(gòu)型。 |

銀蟲 (小有名氣)

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