ANYL 75 |
| Ultrasound assistance is increasingly being used in analytical chemistry, enabling different steps in the analytical process, particularly in sample preparation. In this study by means of a 3 mm probe, ultrasound waves were applied to a methanol solution containing Mexican spices such as vanilla, parsley, coriander, epazote herb, avocado leaf, bay leaf, damiana, pingüica, jamaica flower and spearmint. The extracted water was measured online using a continuous manifold flow and Karl-Fisher reagent. The environmental water was eliminated before the extraction using a flow of N2. Excellent results were obtained, with an extraction time of 2 min. for spices containing less of 15 % of water, and of 6 min. for samples with 15 % or more, whereas with the standard method, (by using methanol as extractant) it is necessary an extraction time of between 30 min. (if stirring) and 60 min. (when left to stand). |
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General Papers
7:00 PM-9:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster
Division of Analytical Chemistry |