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一北向路金蟲 (小有名氣)
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[求助]
哪位大俠幫忙翻譯這段�。。。�
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The most common sample clean-ups are: filtration of the wine [6], [10] and [22] (separation column is preceded generally by a guard column), liquid–liquid extraction [2], [8], [11] and [14] (the extracts are generally dried and evaporated to dryness for concentration), solid extraction [2], [5], [13], [20], [21], [22], [23] and [25] or lixiviation followed by liquid–liquid extraction or solid extraction [3], [12], [14] and [15] in solid samples. Studies have been done on the supercritical fluid extraction of polyphenolic compounds on spiked inert matrices [27]; the modifier was ethyl acetate or methanol (30%), the extraction temperature was 35°C, and the dynamic extraction time was 15 min. In another study [28], the CO2 was modified with 5% methanol, and the extraction parameters were 50°C and 350 bar, with an extraction time of 15 min. Phenol compounds have been also extracted from natural sources as olive leaves [29]. However, to our knowledge, there are no papers on supercritical fluid extraction of these compounds from grape-skin samples. |
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xiaohanhan2007 
捐助貴賓 (小有名氣)
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【答案】應(yīng)助回帖
一北向路(金幣+30, 翻譯EPI+1): 謝謝 2011-11-24 21:17:40
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最常見的樣品凈化方法是：將酒[6],[10]和[22]過濾（分離柱前一般加上保護(hù)柱），進(jìn)行液-液萃取[2], [8], [11]和[14]（一般將提取物干燥并濃縮旋干），固態(tài)萃取[2], [5], [13], [20], [21], [22], [23]和[25]或浸濾后進(jìn)行液-液萃取，或者在固體樣品中進(jìn)行固態(tài)萃取。 已經(jīng)報(bào)道了對添加惰性基質(zhì)上的多酚化合物進(jìn)行超臨界流體萃取的研究[27]；使用的改性劑是乙酸乙酯或甲醇（30%），萃取溫度是35°C，而動態(tài)萃取時間是15分鐘。在另外的報(bào)道當(dāng)中[28]，對CO2使用5%的甲醇進(jìn)行改性，萃取參數(shù)是50°C和350 bar，萃取時間是15分鐘。還可從天然來源例如橄欖油中提取酚類化合物[29]。然而，據(jù)我們所知，還沒有從葡萄皮樣品中超臨界流體萃取這些化合物的報(bào)道。 |
3樓2011-11-24 20:28:51
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2樓2011-11-24 20:26:19
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