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Microwave Clevenger or microwave accelerated distillation (MAD) technique has been compared with the conventional hydro-distillation method, for the extraction of essential oil from fresh orange peels. This microwave extraction method offers important advantages over traditional hydro-distillation, namely; water and solvent free process, shorter extraction times (30 min against 3 h for hydro-distillation); better yields (0.42% against 0.39% for HD); higher oxygenated compounds; environmentally friendly; lower production of by-products (as no water or solvent is used); lower cost; and the possibility for a better reproduction of natural aroma of the orange essential oil than the hydro-distilled essential oil. SEM images of orange peels untreated or subjected to MAD or HD emphasize the difference between the two extraction methods used. Microwaves seem to cause the rupture of the cells and the glands more rapidly than in conventional hydro-distillation. |
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musashino(金币+10, 翻译EPI+1): 2011-02-11 15:11:40
| 对微波Clevenger或微波加速蒸馏技术（MAD）与传统的水蒸馏法（HD）从鲜橙皮中提取精油的效力进行了比较。这种MAD技术相比传统的HD法具有一些重要的优势：提取过程无需水和其它溶剂，提取时间较短（30 min，而HD法需3 h）；收率略优（0.42%，HD：0.39%）；提取物中更多的含氧化合物；环境友好；由于不使用水和其它溶剂，副产物生成少；费用低；而且此法得到的精油与HD法所得者可能更好地保留天然芳香物质。未经处理的和经两种方法处理的橙皮的扫描电镜图片突出显示了两种提取方法的差异。微波法似乎比传统的水蒸馏法更快地导致细胞和腺体的破裂。 |
2楼2011-02-11 14:59:04
