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| Study on extraction process of flavone from toona sinensis roem old leaves |
| Zhao Lei, Zhang Meijuan, Tian Ye, Han Zhifeng, Qi Defeng, Li Pengxin, Tian Pan, Yu Hongwei |
| School of Chemical Engineering of Shijiazhuang University，Shijiazhuang 050035, China |
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Abstract The conditions for the extraction of flavone by ethanol method from toona sinensis roem old leaves were studied. The results showed that under the room temperature, when extraction time was 1.0 h , ratio of feed and liquid was 1∶20 g/mL, 25 g flavone was extracted from toona sinensis roem old leaves, and the high yield was 12.4 %. The structure of product was characteried by one-dimensional infrared spectroscopy and second-derivative infrared spectroscopy and the main chemical compositions are flavone and little polysaccharides.
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