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It was also observed in experiment that as ethanol concentration increases, the polarity of solvent change, which would extract more impurity. It may be seen that 42% ethanol could product the highest extraction yield. The results suggest that 42% ethanol could offer the suitable vapour pressure, viscosity and surface tension of extraction solvent, which are very important physical characteristics of solvent influencing efficiency of sonication activity, for the flavonoids-enriched extract. On the other hand, presence of suitable water in solvent could facilitate increase at the extraction yields since water could helpful to enhance swelling of plant material, which is favourable to increase the contact surface area between the plant matrix and the solvent, resulting in increase of the extraction ratio |
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lhx070806
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4楼2010-07-31 14:46:36
zerohead
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musashino(金币+1, 翻译EPI+1): 2010-08-09 08:48:02
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It was also observed in experiment that as ethanol concentration increases, the polarity of solvent change, which would extract more impurity. It may be seen that 42% ethanol could product the highest extraction yield. 在试验中，我们还观察到随着乙醇的浓度上升，溶剂的极性也会改变，结果是更多的杂质被析出（萃取）。可以推断42%的乙醇浓度可以造成最高的萃取率。 [ Last edited by zerohead on 2010-7-30 at 11:33 ] |
2楼2010-07-30 11:31:27
hekai16
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3楼2010-07-30 21:28:32