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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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zerohead
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musashino(金幣+1, 翻譯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. 在試驗(yàn)中，我們還觀察到隨著乙醇的濃度上升，溶劑的極性也會(huì)改變，結(jié)果是更多的雜質(zhì)被析出（萃�。�。可以推斷42%的乙醇濃度可以造成最高的萃取率。 [ Last edited by zerohead on 2010-7-30 at 11:33 ] |
2樓2010-07-30 11:31:27
hekai16
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3樓2010-07-30 21:28:32
lhx070806
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musashino(金幣+2): 2010-08-09 08:48:08
musashino(金幣+1): 2010-08-09 08:50:18
musashino(金幣+1): 2010-08-09 08:50:18
| 試驗(yàn)中觀察到溶劑的極性隨著乙醇濃度的增加而改變，從而增加雜質(zhì)的溶出。發(fā)現(xiàn)42%乙醇濃度下可達(dá)到最高萃取率。該結(jié)果提示了42%乙醇可提供最適合的蒸汽壓、粘滯性以及萃取劑的表面張力，而蒸汽壓、粘滯性以及萃取劑的表面張力是影響超聲法提取黃酮類物質(zhì)有效性的重要物理特征。另一方面，溶劑中適當(dāng)比列的水有助于萃取率的提高。因?yàn)樗艽龠M(jìn)植物材料的膨脹，有利于增加提取物與溶液的接觸面積，進(jìn)而導(dǎo)致提取率的提高。 |
4樓2010-07-31 14:46:36
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