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Substantially higher amounts of oxygenated compounds and lower amounts of monoterpenes hydrocarbons are present in the essential oil of orange peels extracted by MAD in comparison with HD. The oxygenated fraction in essential oil samples from MAD (11.7%) was higher than HD (7.9%). Monoterpenes hydrocarbons are less valuable than oxygenated compounds in terms of their contribution to the fragrance of the essential oil. Conversely, the oxygenated compounds are highly odoriferous and, hence, the most valuable. The greater proportion of oxygenated compounds in the MAD essential oils is probably due to the diminution of thermal and hydrolytic effects, compared with hydro-distillation, which uses a large quantity of water and is time and energy consuming. Water is a polar solvent, which accelerates many reactions, especially reactions via carbocation as intermediates. |
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2楼2011-02-11 10:11:17
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